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Ian Walmsley

Professor Ian Walmsley

Professor Ian Walmsley

Research Fellow

Interests and expertise (Subject groups)

Grants awarded

Exploring the quantum light-quantum matter interface

Scheme: Wolfson Research Merit Awards

Organisation: University of Oxford

Dates: Aug 2007-Jul 2012

Value: £95,000

Summary: The quantum world is strange – its unfamiliarity continues to baffle our intuitive concepts of light and matter arrived at from experience of the everyday world. For instance, a single particle that may be in two places at once, and pairs of particle that have stronger correlations than anything we can find in our normal experience. Exploiting this strangeness may provide technological benefits whose development will at the same time lead to greater understanding of the contrasts between the classical world of common experience and the quantum world that underpins it. We are studying how to build up communications networks that make use of quantum effects. These require the construction of “large” quantum states: many individual or pairs of photons - particles of light - separated by long distances at the nodes of a network. Such states may be used to transfer information from one point to another, or to several parties at once in secure ways, or in ways that preserve the quantum character of that information so that it may be used for other applications, such as remote sensing. In order to implement such networks, we are developing tools to map quantum correlations or entanglement between light and matter, so that we can store this quantum feature for long enough to enable remote nodes of a network to be connected. Aside from the practical implications of such quantum-enhanced technologies, studying the resources required to produce large-scale quantum states containing multiple particles distributed over large distances sheds some light on the differences between the classical and quantum worlds, in terms of how much elementary “stuff” (e.g. space, time, energy, numbers of particles) is needed to effect certain operations.

Entangled photon creation and characterization and one-way quantum computing

Scheme: International Incoming Fellowships

Organisation: University of Oxford

Dates: Oct 2006-Sep 2008

Value: £157,537.60

Summary: This project summary is not available for publication.

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