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Atomic and Laser Physics
Credit: Jack Hobhouse

Dr Axel Kuhn

Associate Professor of Experimental Quantum Optics

Research theme

  • Quantum information and computation
  • Quantum optics & ultra-cold matter

Sub department

  • Atomic and Laser Physics

Research groups

  • Atom-photon connection
Axel.Kuhn@physics.ox.ac.uk
Telephone: 01865 (2)72333,01865 (2)76227
  • About
  • Publications

How to administer an antidote to Schrodinger's cat

JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS 55:5 (2022) ARTN 054001

Authors:

Juan-Rafael Alvarez, Mark IJspeert, Oliver Barter, Ben Yuen, Thomas D Barrett, Dustin Stuart, Jerome Dilley, Annemarie Holleczek, Axel Kuhn
More details from the publisher

How to administer an antidote to Schrödinger's cat

ArXiv 2106.09705 (2021)

Authors:

Juan-Rafael Álvarez, Mark IJspeert, Oliver Barter, Ben Yuen, Thomas D Barrett, Dustin Stuart, Jerome Dilley, Annemarie Holleczek, Axel Kuhn

Abstract:

In his 1935 Gedankenexperiment, Erwin Schr\"{o}dinger imagined a poisonous substance which has a 50% probability of being released, based on the decay of a radioactive atom. As such, the life of the cat and the state of the poison become entangled, and the fate of the cat is determined upon opening the box. We present an experimental technique that keeps the cat alive on any account. This method relies on the time-resolved Hong-Ou-Mandel effect: two long, identical photons impinging on a beam splitter always bunch in either of the outputs. Interpreting the first photon detection as the state of the poison, the second photon is identified as the state of the cat. Even after the collapse of the first photon's state, we show their fates are intertwined through quantum interference. We demonstrate this by a sudden phase change between the inputs, administered conditionally on the outcome of the first detection, which steers the second photon to a pre-defined output and ensures that the cat is always observed alive.
Details from ArXiV

Light-matter interaction in open cavities with dielectric stacks

Applied Physics Letters AIP Publishing 118:15 (2021) 154002

Authors:

A Saharyan, Jr Álvarez, Th Doherty, A Kuhn, S Guérin

Abstract:

We evaluate the exact dipole coupling strength between a single emitter and the radiation field within an optical cavity, taking into account the effects of multilayer dielectric mirrors. Our model allows one to freely vary the resonance frequency of the cavity, the frequency of light or atomic transition addressing it, and the design wavelength of the dielectric mirror. The coupling strength is derived for an open system with unbound frequency modes. For very short cavities, the effective length used to determine their mode volume and the lengths defining their resonances are different, and also found to diverge appreciably from their geometric length, with the radiation field being strongest within the dielectric mirror itself. Only for cavities much longer than their resonant wavelength does the mode volume asymptotically approach that normally assumed from their geometric length.
More details from the publisher
Details from ORA
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Pushing Purcell enhancement beyond its limits

NEW JOURNAL OF PHYSICS 22:6 (2020) ARTN 063013

Authors:

Thomas D Barrett, Thomas H Doherty, Axel Kuhn
More details from the publisher
Details from ArXiV

Roadmap on STIRAP applications

JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS 52:20 (2019) ARTN 202001

Authors:

Klaas Bergmann, Hanns-Christoph Naegerl, Cristian Panda, Gerald Gabrielse, Eduard Miloglyadov, Martin Quack, Georg Seyfang, Gunther Wichmann, Silke Ospelkaus, Axel Kuhn, Stefano Longhi, Alexander Szameit, Philipp Pirro, Burkard Hillebrands, Xue-Feng Zhu, Jie Zhu, Michael Drewsen, Winfried K Hensinger, Sebastian Weidt, Thomas Halfmann, Hai-Lin Wang, Gheorghe Sorin Paraoanu, Nikolay V Vitanov, Jordi Mompart, Thomas Busch, Timothy J Barnum, David D Grimes, Robert W Field, Mark G Raizen, Edvardas Narevicius, Marcis Auzinsh, Dmitry Budker, Adriana Palffy, Christoph H Keitel
More details from the publisher
Details from ORA

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