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Artist's impression of self organisation of ultracold atoms in an optical cavity. Credit: T Esslinger
Theo Murphy international scientific meeting organised by Dr Jonathan Keeling, Professor Steven Girvin, Dr Michael Hartmann and Professor Peter Littlewood FRS.
Arrays of coupled cavities, coupled to quantum emitters, may be used to engineer strongly correlated phases of mixed light-matter excitations. These systems allow strongly correlated phases from condensed matter to be explored in the context of optical systems, providing new opportunities to understand strongly correlated quantum systems, and necessarily provoking questions of how such phases look out of equilibrium.
A poster session will be held throughout this meeting alongside the schedule of presentations and discussion.
List of speakers and chairs
Professor Jacqueline Bloch, Dr Iacopo Carusotto, Professor Andrew Cleland, Professor Hui Deng, Professor Tilman Esslinger, Professor Rosario Fazio, Professor Ed Hinds, Professor Andrew Houck, Professor Ataç İmamoğlu, Professor Jens Koch, Professor Mikhail Lukin, Professor Martin Plenio, Professor Arno Rauschenbeutel, Professor Timothy Spiller, Dr Jacob Taylor, Professor Hakan Tureci, Professor Andreas Wallraff.
Programme available here
Attending this event
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Dr Jonathan Keeling, University of St Andrews, UKOrganiser
Jonathan Keeling is a Reader in Theoretical Condensed Matter Physics in the Scottish Universities Physics Alliance at the University of St Andrews. Previously he held an EPSRC Career acceleration fellowship first in Cambridge, and then in St Andrews. Prior to that he was a research fellow at Pembroke College Cambridge and a Lindemann Fellow at the Massachusetts Institute of Technology. He did his undergraduate and graduate degrees at the University of Cambridge. He has worked largely on exciton–polariton condensation, and more recently has begun to work on many-body quantum optics in systems of cold atoms in optical cavities and of superconducting qubits in microwave cavities.
Professor Steven Girvin, Yale University, USAQuantum control toolbox and bath engineering in the strong-dispersive limit of circuit QED
Steven Girvin is Eugene Higgins Professor of Yale University. He has served as Deputy Provost for Science and Technology at Yale since September 2007. In that role, he has broad oversight for all of the natural science departments within the Faculty of Arts and Sciences, the School of Engineering and the School of Forestry and Environmental Studies.
Throughout his career, Professor Girvin’s research has focused on theoretical studies of strongly interacting quantum matter including such topics as the fractional quantum Hall effect and the superconductor-insulator quantum phase transition. His research is currently focused on ‘circuit QED,’ which describes the quantum behavior of electrical circuits. He works closely with the experimental team of Rob Schoelkopf and Michel Devoret at Yale developing circuit QED both into an architecture for quantum computation and as a novel platform for ultra-strong-coupling non-linear quantum optics with microwave photons and superconducting qubits acting as artificial atoms.
Professor Girvin has been elected to the American Association for the Advancement of Science, the American Academy of Arts and Sciences, the US National Academy of Sciences, and the Royal Swedish Academy of Sciences. In 2007 he shared the Oliver E Buckley Prize of the American Physical Society.
Circuit QED is the analog of cavity QED in which the role of atoms is played by superconducting qubits. The ability to engineer the properties of these artificial atoms allows them to have enormous electric dipole matrix elements and hence couple to microwave photons with a strength limited only by the value of the fine structure constant. Even when the qubit transition frequency is strongly detuned from the cavity frequency, the resulting dispersive coupling between the two can be three to four orders of magnitude larger than the line widths of both the qubit and the cavity. This ‘strong-dispersive’ limit allows access to a new and unprecedented range of tools for quantum control, measurement, feedback, autonomous cooling and entanglement pumping. It can also be used to create the world’s largest Schrödinger cats.
Dr Michael Hartmann, Technical Unversity, Munich, GermanyOrganiser
Michael Hartmann studied physics at the Ludwig Maximilians Universität München. In 2005 he obtained his PhD in physics from the University of Stuttgart for work on thermal properties of quantum systems on small length scales. As a Feodor-Lynen fellow of the Humboldt Foundation he then joined Martin Plenio’s group at Imperial College in London, where he started to work on quantum optical effective many body systems. Since 2008 he runs a research group funded by the Emmy Noether Programme of the Deutsche Forschungsgemeinschaft at Technische Universität München. His main research interests are quantum optical effective many body systems, circuit quantum electrodynamics and optomechanics.
Professor Peter Littlewood FRS, Argonne National Laboratory, USAOrganiser
Peter B Littlewood is Associate Laboratory Director for Physical Sciences and Engineering at the U.S. Department of Energy's Argonne National Laboratory. He also holds an appointment as Professor of Physics in the James Franck Institute at the University of Chicago.
He came to Argonne from Cambridge University, United Kingdom, where he was Head of the Cavendish Laboratory and the Department of Physics at the University of Cambridge. He previously headed the Theory of Condensed Matter group at the Cavendish Laboratory. During a 2003-2004 sabbatical leave, he was Matthias Scholar at Los Alamos National Laboratory.
Prior to joining Cambridge, he worked at Bell Laboratories from 1980 through 1997, finishing his time there as head of Theoretical Physics Research.
His research activities include the dynamics of collective transport (charge-density wave, Wigner crystal, vortex lattice); phenomenology and microscopic theory of high-temperature superconductors, transition metal oxides, and other correlated electronic systems; and optical properties of highly excited semiconductors. He also has interests in theoretical engineering, including holographic storage, optical fibers and devices, and materials for energy applications.
He holds a bachelor's degree in Natural Sciences (Physics) and a Ph.D. in Physics, both from the University of Cambridge. He is a fellow of the Royal Society of London, the Institute of Physics, TWAS, and the American Physical Society.
Professor Andrew Houck, Princeton University, USAMany body quantum optics with superconducting cavity arrays
Andrew Houck is an associate professor of electrical engineering and physics at Princeton University. He received a PhD from Harvard University in 2005 working on negative index of refraction materials, and was a postdoctoral fellow at Yale University working on superconducting quantum computing until 2008. At Princeton, his laboratory primarily focuses on quantum optics, quantum computing, and correlated states of light using superconducting microwave circuits. His group has been building a toolbox for realizing many-body states of light, included well-controlled small cavity chains, large low-disorder cavity arrays, and a scanned probe tool for imaging quantum photon states. He is a Packard fellow and winner of a Presidential Early Career Award.
Professor Hakan Tureci, Princeton University, USAMany body physics with coupled light-matter systems
Hakan E Tureci is an Assistant Professor in the Department of Electrical Engineering at Princeton University. Prior to joining Princeton faculty, he obtained a BS degree in Physics from Bilkent University and received his Ph.D. from Yale University in 2003 for his dissertation on mesoscopic optics. He did his postdoctoral work at Yale University and in the Institute for Quantum Electronics at ETH Zurich. In 2009, he was appointed SNF Professor for Mesoscopic Quantum Optics at ETH.
He moved to Princeton University in 2010. His research focuses on theoretical problems in quantum optics, photonics and lasers, in particular non-equilibrium quantum dynamics of coupled light-matter systems. He is the recipient of the NSF CAREER Award and the DARPA Young Faculty Award.
Quantum matter coupled to enhanced optical fields in confined geometries such as resonators and waveguides offer a promising platform to study quantum dynamics and phase transitions far from equilibrium. Excitations of such systems are typically hybrid quasiparticles of light and matter, inheriting long-range coherence properties of photons and strong interactions derived from its material excitations. A crucial feature of these systems is that the fundamental light-matter interaction is particle non-conserving and the description of the system benefits immensely from an open quantum system approach. I will first discuss our theoretical work on the self-organization transition of an optically driven atomic condensate coupled to a cavity. In this system, recently realized in a series of experiments, cavity-mediated long-range interactions between atoms, tunable by the drive strength, lead to softening of a roton-like excitation mode. Two unique features of this open many-body system that I will be highlighting are the critical exponents for the photon flux leaving the cavity and the physical mechanism behind the mysterious damping of the roton-like mode observed in very recent experiments. I will then discuss our work on quantum phases of Cavity QED systems described by the Rabi-Hubbard Model. Here, such long-range photon mediated interactions are also at play and lead to an instability towards a gapped super-radiant many-body state as the light-matter coupling is increased.
Professor Arno Rauschenbeutel, Vienna University of Technology, AustriaPreparing and manipulating quantum states of light and matter with atoms trapped around an optical nanofiber
Arno Rauschenbeutel was born in Düsseldorf, Germany, 1971. During his PhD, he worked on cavity quantum electrodynamics with Rydberg atoms in the group of Professor Serge Haroche at the Laboratoire Kastler Brossel, Ecole Normale Supérieure, Paris, France, and obtained the PhD degree from the Université Paris VI, France, in 2001. He was a Senior Scientist in the group of Professor Dieter Meschede at the Institute for Applied Physics, University of Bonn, Germany, a Professor at the University of Mainz, Germany, and currently holds the Chair for Applied Quantum Physics at the Atominstitut, Vienna University of Technology, Austria.
He is one of the founding members of the Vienna Center for Quantum Science and Technology. His research interests include experimental quantum optics, nanophotonics, cavity quantum electrodynamics, optical nanofibers, optical microresonators, and cooling and trapping of neutral atoms. Professor Rauschenbeutel received the Marie Curie Excellence Award of the European Commission, the European Young Investigators Award of the European Science Foundation, and the Lichtenberg-Professorship of the Volkswagen-Foundation.
Professor Martin Plenio, Ulm, GermanyQuantum many body phononics in ion traps.
Martin Plenio, born in 1968, received his Diploma and Doctorate in Physics from the Göttingen University in 1992 and 1994 respectively. In 1995 he moved to the group of Prof. Sir Peter Knight FRS at Imperial College London as a Feodor Lynen Fellow of the Humboldt Foundation, became a Lecturer at Imperial College in 1998 and a Full Professor there in 2003. In 2009 he accepted the award of an Alexander von Humboldt Professorship to move to Ulm University, Germany. In 2012 he received an ERC Synergy grant to conduct research Diamond Quantum Devices and Biology. His research covers quantum information and quantum technology, quantum optics and the application of these methods to the exploration of quantum effects in biology.
In this lecture I will present our recent results concerning the dynamics of phonons in ion traps. Specifically, I will report on (i) our work on stationary non-equilibrium transport phenomena of phonons in 1-dimensional ion crystals, (ii) on our work on an experimental realisation of the Kibble- Zurek mechanism in ion traps and (iii) on a unifying treatment of Kibble-Zurek scaling.
Professor Tilman Esslinger, ETH, SwitzerlandSynthetic quantum many-body systems
Tilman Esslinger is full professor at the Physics Department of ETH Zurich and received his PhD from the Ludwig-Maximilians-University in Munich. He shared a Phillip Morris Research Prize and was awarded an ERC advanced grant in 2009. In his research he uses ultracold atoms to synthetically create and study key models of quantum many-body physics. He pioneered the realizations of bosonic and fermionic Hubbard models, one dimensional quantum gases and atom lasers. The observations of the quantum phase transition between a superfluid and a Mott insulating state and the cross-over between a metal and a Mott-insulator have established a new approach to quantum many-body phenomena. Recently he and his group have observed the Dicke phase transition to a superradiant state, realized a graphene analogue with cold atoms and pioneered conduction measurements with quantum gases. His work stimulated the interdisciplinary exchange between the condensed-matter and quantum-gas communities.
Fermionic quantum gases in optical lattices make it possible to physically construct and study key models of condensed matter physics. The riddle of high temperature superconductivity, or the beauty of graphene, are becoming accessible to experiments, in which the Hamiltonian is a direct result of the optical lattice potential created by interfering laser fields and short-ranged collisional interaction between ultracold atoms. Going beyond this approach, we have created cold-atom analogues of mesoscopic conductors and superconductors. A narrow channel made of light connects two macroscopic reservoirs of fermionic atoms. I will introduce the above concepts and report on our most recent results on quantum magnetism and conduction.
Professor Hui Deng, University of Michigan, USAQuantum correlations of light in single, few, and many-body systems.
Hui Deng received her BS degree in Modern Physics from Tsinghua University (China) in 1999 and her PhD degree in Applied Physics from Stanford University in 2006. After holding a postdoc fellow position at the California Institute of Technology, she joined the University of Michigan at Ann Arbor in 2008 as an assistant professor in physics. Her current research focuses on the creation, control and applications of both single quantum states and collective quantum phenomena in solid and light systems. She has received the CAREER awards from the US National Science Foundation and the YIP awards from the US Air Force Office of Scientific Research.
Dr Iacopo Carusotto, INO-CNR BEC Center, Trento, ItalyTowards quantum hall liquids of light
Iacopo Carusotto completed his PhD in 2000 at Scuola Normale Superiore in Pisa under the supervision of Prof G C La Rocca. After a post-doc in Paris at LKB in the group of Y Castin, since 2003 he works in Trento as a Researcher at the BEC Center of INO-CNR. During the years, he has been Maitre de Conferences at College de France in the group of C Cohen Tannoudji and Visiting Professor and ETH in the group of A Imamoglu.
His research interests range from nonlinear and quantum optics of the so-called quantum fluid of light, to ultracold atomic gases and condensed-matter models of quantum field theories on curved space-times.
In this talk I will review the general concept of synthetic gauge field for photons and I will discuss its interplay with strong optical nonlinearities to generate new strongly correlated states of light in a non-equibrium framework. Different geometries will be considered, from a Bose-Hubbard-like array of many single-mode cavities to rotating photon gases in a single fiber-tip cavity.
Professor Jacqueline Bloch, LPN/CNRS, FranceBose condensates in microstructured semiconductor cavities: interactions, propagation and localization
After a PhD in semiconductor spectroscopy on the study of quantum wires, Jacqueline Bloch received a permanent position at CNRS in 1994.
She initiated a research program on semiconductor microcavities. In 1998-1999, she worked for one year at Bell Laboratories (USA) in the field of ultra-fast spectroscopy in the group of Jagdeep Shah. She defended her habilitation in 2009 and was promoted as CNRS Research Director in 2010.
Jacqueline Bloch is presently leading a research group of 8 persons at Laboratory of Photonics and Nanostructures (LPN), in Marcoussis, France. Her group is among the leaders in the field of cavity polaritons with a unique expertise in the study of polariton condensates in microstructured resonators.
Jacqueline Bloch is responsible for Nanophotonics at LPN. She is a member of the Research National Panel (Comité National) in charge of the evaluation, promotion and recruitment of CNRS researchers. She is also a member of an ERC panel.
Jacqueline Bloch is author of more than 125 publications including 80 peer reviewed articles.
At the frontier between non-linear optics and Bose Einstein condensation, semiconductor microcavities opened a new research field both for fundamental studies of bosonic quantum fluids in a driven dissipative system. Using nanotechnology, the potential in which polariton condensates are generated can be fully engineered into 1D and 2D microcircuits. In particular, single micropillars coupled to 1D contacts, or arrays of micropillars with controlled tunnel coupling can be realized.
I will first report on a non-linear resonant tunneling polariton diode which presents strong bistability induced by polariton-polariton interactions. This device offers a promising geometry to reach the quantum regime of polariton blockade and realize arrays of quantum islands.
The physics of arrays of coupled condensates will then be adressed. We recently demonstrated non-linear josephson oscillations and macroscopic self-trapping in a photonic molecule, made of two coupled micropillars. We are now studying honeycomb lattices of coupled micropillars. Far field emission directly reveals Dirac cones and a flat band: thus in the same lattice, mass-less quasi-particles and infinitely massive quasi-particles can be excited.
 Macroscopic quantum self-trapping and Josephson oscillations of exciton-polaritons, M. Abbarchi et al. Nature Physics 9, 275(2013);
 Realization of a double barrier resonant tunneling diode for cavity polaritons, H-.S. Nguyen et al., Phys. Rev. Lett. 110, 236601 (2013);
 Direct observation of Dirac cones and a flatband in a honeycomb lattice for polaritons, T. Jacqmin et al. under preparation
Professor Ataç Imamoğlu, ETH, SwitzerlandStrongly interacting photons in semiconductor nanostructures
Atac Imamoglu has been full Professor of Quantum Electronics at the Department of Physics of the ETH Zurich since December 2002, where he is heading the research group on Quantum Photonics.
Professor Imamoglu received his PhD from Stanford University with a dissertation on electromagnetically induced transparency and lasers without inversion. After postdoctoral stays at NTT Basic Research Laboratories in Tokyo, Japan and at the Institute of Theoretical Atomic and Molecular Physics at Harvard University in Cambridge, Massachusetts, he joined The University of California at Santa Barbara as an Assistant Professor in 1993. He was promoted to Associate Professorship in 1997 and to full Professorship in 1999. Professor Imamoglu has pioneered the use of quantum dots in study of quantum optical phenomena. In particular, his group demonstrated the first quantum dot single photon source, the Purcell effect in quantum dot cavity-QED, and the use of photon correlation spectroscopy to understand quantum dot physics. Hiss current research interests include the study of strongly correlated systems using quantum optical techniques.
Professor Imamoglu received the Charles Townes Award of the OSA in 2010, The Quantum Electronics Award of IEEE in 2009, Wolfgang Paul Award of the Humboldt Foundation in 2002, David and Lucile Packard Fellowship in 1996, and NSF Career Award in 1995. He is a fellow of the American Physical Society and of the Optical Society of America.
Cavity quantum-electrodynamics (QED) has emerged as an invaluable tool for coherent manipulation of zero-dimensional quantum emitters. I will describe recent experiments where we use cavity-QED to study two-dimensional electron systems exhibiting many-body effects such as Fermi-edge singularity and quantum Hall effect. In the absence of an external magnetic field, we find that tuning a two-dimensional cavity into resonance with the Fermi energy leads to the formation of Fermi-edge polaritons: these new quasi-particles with an ultra-small effective mass exhibit asymmetric lineshapes signalling non-trivial many-body effects. When an external magnetic field is applied, the polariton excitations carry signatures of the initial states. These optical excitations, termed quantum Hall polaritons, provide a new and minimally invasive spectroscopic tool to study the bulk properties and in this sense are complementary to transport measurements.
Dr Jacob M Taylor, National Institute of Standards and Technology/Joint Quantum Institute, USAHybrid quantum devices for optical many-body systems
Taylor is a Physicist at the National Institute of Standards and Technology, and a JQI Fellow and Adjunct Assistant Professor of Physics at the Joint Quantum Institute. His group investigates hybrid quantum systems, quantum-assisted metrology, and the fundamental limits to quantum devices for computation and communication. He received an AB in Astronomy & Astrophysics and Physics at Harvard in 2000 and then spent a year as a Luce Scholar at the University of Tokyo studying gravitation. Taylor did his PhD in the group of Mikhail Lukin in 2006, working on approaches to quantum computing and fault tolerance using spins in quantum dots. He went on to a Pappalardo Fellowship at MIT, working with members of both the Condensed Matter Theory group and the Center for Theoretical Physics, and during that time co-invented NV center magnetometry. In 2009 Taylor joined the Joint Quantum Institute, and is the recipient of the Newcomb Cleveland Prize of the AAAS and of the Samuel J. Heyman Service to American "Call to Service'' medal. More information can be found at http://groups.jqi.umd.edu/taylor
Professor Mikhail Lukin, Harvard, USAStrongly interacting photons in quantum nonlinear medium
Mikhail Lukin received a PhD degree from Texas A&M University in 1998. He joined the faculty of Harvard Physics Department as an Assistant Professor in 2001 and has been Professor of Physics at Harvard since 2004. He is currently a co-Director of Harvard-MIT Center of Ultracold Atoms and of Harvard Quantum Optics Center. His research interests include quantum optics, quantum control of atomic and nanoscale solid-state systems, quantum dynamics of many-body systems and quantum information science. He has co-authored over 200 technical papers and has received a number of awards, including Alfred P Sloan Fellowship, David and Lucile Packard Fellowship for Science and Engineering, NSF Career Award, Adolph Lomb Medal from the Optical Society of America, AAAS Newcomb Cleveland Prize and I I Rabi Prize from APS. He is a fellow of the Optical Society of America, of the American Physical Society and of the American Association for Advancement of Science.
We will discuss recent developments involving strongly interacting optical photons at a new scientific interface between quantum optics, many body physics, nanoscience and quantum information science. Specific examples include nonlinear optics with individual optical photons using strongly interacting atoms in Rydberg states and single photon switching using individual atoms strongly coupled to nanoscale photonic crystal cavities. Novel applications of these techniques ranging from quantum networks to strongly interacting photonic system will be discussed.
Professor Rosario Fazio, Scuola Normale Superiore, ItalySolid phases in driven non-linearly coupled cavities
Professor Rosario Fazio: Head of the theory group "Condensed Matter & Quantum Information" at SNS. Got his PhD in Physics in 1989 at the University of Catania. He is presently Professor of Condensed Matter Physics at Scuola Normale Superiore in Pisa and group leader of NEST-CNR-INFM. His interests cover a wide range of topics including quantum information (entanglement in many-body systems, tensor networks, superconducting qubits), quantum transport in nanostructures, superconductivity, Josephson arrays, optical lattices, QED-arrays, superconducting nano-electromechanical systems.
I will discuss the properties of an array of QED cavities coupled by nonlinear elements, in the presence of photon leakage and driven by a coherent source. The nonlinear couplings lead to photon hopping and to nearest-neighbour Kerr terms. By tuning the system parameters, the steady state of the array can exhibit a photon crystal associated with a periodic modulation of the photon blockade. In some cases, the crystalline ordering may coexist with phase synchronization. The class of cavity arrays which are consider can be realised with superconducting circuits of existing technology
Professor Ed Hinds, Imperial College, UKCoupling light to atoms and molecules on a chip
Professor Ed Hinds is a Royal Society Research Professor and Director of the the Centre for Cold Matter at Imperial College London http://www3.imperial.ac.uk/ccm/. His interests include (1) Quantum coherent manipulation of atoms and photons on atom chips; (ii) Production and applications of cold molecules; (iii) Tests of fundamental physical laws.
He is a fellow of the Royal Society, the Americal Physical Society, the Optical Society of America, and the Institute of Physics. He has been awarded the IoP Thompson Medal and Prize (2008), the Royal Society Rumford Medal (2008) and the IoP Faraday Medal and Prize (2013).
A single quantum emitter coupled to an optical cavity can be a versatile tool for quantum processing. It can be a source of single photons, a nonlinearity causing single photons to interact with each other, and an interconnect between flying qubits (the photons) and qubit memory (the emitter). The physics of these processes has been quite fully developed using individual macroscopic cavities coupled to atoms or ions. An important next step is to scale the systems to include many cavities and many individual quantum emitters. This motivates the development in my laboratory of microfabricated chips that offer a degree of scalability.
I will describe experiments on single atoms coupled to single microfabricated cavities, new chips in which many cavities are interconnected to make a chain capable of computation, and first steps towards the use of single dye molecules as the quantum emitters.
Professor Jens Koch, Northwestern University, USAQuantum phases and nonequilibrium dynamics in circuit QED lattices
Jens Koch graduated from Freie Universitat Berlin in 2006 with a dissertation on quantum transport through single molecules. He spent his postdoc time at Yale University, working on theory of superconducting quantum circuits and circuit QED in Steven Girvin’s group. Jens is currently a faculty member in the Department of Physics and Astronomy at Northwestern University. Research in his group focuses on two main topics: one, the theory of strongly correlated polaritons in circuit QED arrays, their nonequilibrium dynamics and dissipative phase transitions and two, on quantum properties of novel superconducting circuits.
Many systems established or proposed as quantum simulators address the physics of quantum phase transitions and the elementary excitations of the underlying many-body states. Photon-based systems such as circuit QED arrays feature several peculiarities that set them apart from the conventional simulators. In particular, a crucial difference is the intrinsic open-system character of these quantum systems. After a review of the experimental status and the theoretical challenges in modeling large open quantum systems, I will present a perturbation formalism for the Lindblad master equation and illustrate its application to circuit QED arrays.
Professor Andreas Wallraff, ETH, SwitzerlandWaveguide QED with an ensemble of two-level systems
Since January 2012 Andreas Wallraff has been a Full Professor for Solid State Physics in the Department of Physics at ETH Zurich. He joined the department in January 2006 as a Tenure Track Assistant Professor and was promoted to Associate Professor in January 2010. Previously, he has obtained degrees in physics from Imperial College of Science and Technology, London, U.K., Rheinisch Westfälische Technische Hochschule (RWTH) Aachen, Germany and did research towards his Masters degree at the Research Center Jülich, Germany. During his doctoral research he investigated the quantum dynamics of vortices in superconductors and observed for the first time the tunneling and energy level quantization of an individual vortex for which he obtained a PhD degree in physics from the University of Erlangen-Nuremberg. During the four years he spent as a research scientist at Yale University in New Haven, CT, USA he performed experiments in which the coherent interaction of a single photon with a single quantum electronic circuit was observed for the first time. Now his research is focused on the experimental investigation of quantum effects in mesoscopic electronic circuits for performing fundamental quantum optics experiments and also for applications in quantum information processing. His group at ETH Zurich engages in research on micro and nano-electronics, with a particular focus on hybrid quantum systems combining superconducting electronic circuits with semiconductor quantum dots and individual Rydberg atoms, making use of fast and sensitive microwave techniques at ultra-low temperatures.
Andreas Wallraff received the Nicholas Kurti European Science Prize in March 2006 in recognition of a record of sustained achievement working at the forefront of quantum device research employing experimental low-temperature techniques. In 2009 he was awarded the prestigious European Research Council (ERC) Starting Independent Research Grant to work on hybrid cavity quantum electrodynamics with atoms and circuits. In 2011 Andreas Wallraff was awarded the ETH Zurich Max Roessler Prize.
Photon-mediated interactions between atoms are of fundamental importance in quantum optics, quantum simulations and quantum information processing. In three dimensions the exchange of real and virtual photons between atoms gives rise to non-trivial interaction effects. To explore these interaction effects, we use two superconducting qubits in an open one-dimensional transmission line. We demonstrate strong atom-atom interactions mediated by photons over distances between three quarters and one photon wavelength ~ 2 cm, and observe both coherent exchange interactions and the creation of super- and sub-radiant states.
Professor Timothy Spiller, University of Leeds, UKCool for cats
Professor Tim Spiller holds a chair in Quantum Information Science at the School of Physics and Astronomy and is Head of the Quantum Information Research Group and Director of Research for the School.
His previous role was Distinguished Technologist and Director of Quantum Information Processing Research with Hewlett-Packard Laboratories in Bristol.
Professor Spiller’s interests and areas of expertise are: quantum information – ‘hardware’ and ‘software’; quantum technologies; condensed matter physics and superconductivity.
His current research projects include quantum information technologies and applications: quantum communication; quantum computing and processing (particularly few-qubit technologies that could be realised in the relatively near future); quantum-enhanced sensing and metrology and applications of quantum information technologies and concepts to fundamental physics.
With over 100 publications, Professor Spiller has had 14 quantum information technology patents granted, with a further 10 pending. He is a Fellow of the Institute of Physics, was Scientific Coordinator of QUIPROCONE 2000-3 (the first EC Network of Excellence for Quantum Information and Communication www.quiprocone.org), and founding chair 2006-7 of the UK Institute of Physics QQQ Subject Group (quantum information, quantum optics and quantum control) http://www.iop.org/activity/groups/subject/qqq/index.html).
Superconducting devices and circuits have been of interest in the quantum arena for many years, for example from the perspectives of macroscopic quantum phenomena, Schrödinger’s cat and, more recently, new quantum technologies. From the quantum optics perspective, a Josephson circuit element provides a strong non-linearity. With other quantum optics input, I'll discuss how a superconducting device can be arranged to evolve to a cat state under the action of an absorptive environment and discuss a model for such an environment. Such cat states are of fundamental interest and have potential application in quantum metrology and sensing.
Professor Andrew Cleland, University of California – Santa Barbara, USACoupling electronics, mechanics and light
Andrew Cleland received his BS (Engineering Physics) from UC Berkeley in 1983, and his PhD (Physics) from UC Berkeley in 1991. He worked as a postdoctoral researcher in the Centre d'Etudes-Orme des Merisiers in Saclay, France, followed by an appointment as a Senior Research Fellow at Caltech. In 1997 he moved to the University of California at Santa Barbara - Department of Physics, where he is a Professor of Physics and Associate Director of the California Nanosystems Institute. His research interests include quantum computation, the physics of nanoscale electronic, mechanical and optomechanical devices, and microfluidics-based high-throughput sensing.
I will report on our progress in developing a quantum-coherent microwave-to-optical photon converter. This device is based on a piezoelectrically-actuated optomechanical crystal, comprising a nanoscale-patterned thin film of aluminum nitride, a strong piezoelectric, which defines an optomechanical crystal with co-localized optical and mechanical modes, and includes electrodes that permit electromechanical actuation. We are developing this device to enable the generation of optical-frequency entangled photons from microwave photons synthesized by a superconducting qubit. This device would enable the coherent transfer of quantum information from a millikelvin cryostat to a near-visible fiber-optic transmission line, with the potential of coupling hybrid quantum systems; providing high-speed quantum communications; and perhaps reading and writing to a quantum memory, such as might be provided by a surface code quantum computer
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