Professor Ian Walmsley CBE FRS FCGI: Publications

Broadband noise-free optical quantum memory with neutral nitrogen-vacancy centers in diamond

Physical Review B American Physical Society (APS) 91:20 (2015) 205108

Authors:

E Poem, C Weinzetl, J Klatzow, KT Kaczmarek, JHD Munns, TFM Champion, DJ Saunders, J Nunn, IA Walmsley

Quantum optics: Science and technology in a new light

Science American Association for the Advancement of Science (AAAS) 348:6234 (2015) 525-530

Interfacing GHz-bandwidth heralded single photons with a warm vapour Raman memory

New Journal of Physics IOP Publishing 17:4 (2015) 043006

Authors:

PS Michelberger, TFM Champion, MR Sprague, KT Kaczmarek, M Barbieri, XM Jin, DG England, WS Kolthammer, DJ Saunders, J Nunn, IA Walmsley

Directly comparing entanglement-enhancing non-Gaussian operations

New Journal of Physics IOP Publishing 17:2 (2015) 023038

Authors:

Tim J Bartley, Ian A Walmsley

Ultrahigh and persistent optical depths of cesium in Kagomé-type hollow-core photonic crystal fibers

Optics Letters Optical Society of America 40:23 (2015) 5582-5585

Authors:

Krzysztof Kaczmarek, Dylan J Saunders, Michael R Sprague, W Steven Kolthammer, Amir Feizpour, Patrick M Ledingham, Benjamin Brecht, Eilon Poem, Ian A Walmsley, Joshua Nunn

Abstract:

Alkali-filled hollow-core fibers are a promising medium for investigating light–matter interactions, especially at the single-photon level, due to the tight confinement of light and high optical depths achievable by light-induced atomic desorption (LIAD). However, until now these large optical depths could only be generated for seconds, at most once per day, severely limiting the practicality of the technology. Here we report the generation of the highest observed transient (>105 for up to a minute) and highest observed persistent (>2000 for hours) optical depths of alkali vapors in a light-guiding geometry to date, using a cesium-filled Kagomé-type hollow-core photonic crystal fiber (HC-PCF). Our results pave the way to light–matter interaction experiments in confined geometries requiring long operation times and large atomic number densities, such as generation of single-photon-level nonlinearities and development of single photon quantum memories.

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