Coherently Opening a High-Q Cavity

Tommaso Tufarelli, Alessandro Ferraro, Alessio Serafini, Sougato Bose, and M. S. Kim
Phys. Rev. Lett. 112, 133605 – Published 4 April 2014
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Abstract

We propose a general framework to effectively “open” a high-Q resonator, that is, to release the quantum state initially prepared in it in the form of a traveling electromagnetic wave. This is achieved by employing a mediating mode that scatters coherently the radiation from the resonator into a one-dimensional continuum of modes such as a waveguide. The same mechanism may be used to “feed” a desired quantum field to an initially empty cavity. Switching between an open and “closed” resonator may then be obtained by controlling either the detuning of the scatterer or the amount of time it spends in the resonator. First, we introduce the model in its general form, identifying (i) the traveling mode that optimally retains the full quantum information of the resonator field and (ii) a suitable figure of merit that we study analytically in terms of the system parameters. Then, we discuss two feasible implementations based on ensembles of two-level atoms interacting with cavity fields. In addition, we discuss how to integrate traditional cavity QED in our proposal using three-level atoms.

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  • Received 5 September 2013

DOI:https://doi.org/10.1103/PhysRevLett.112.133605

© 2014 American Physical Society

Authors & Affiliations

Tommaso Tufarelli1,*, Alessandro Ferraro2, Alessio Serafini3, Sougato Bose3, and M. S. Kim1

  • 1QOLS, Blackett Laboratory, Imperial College London, London SW7 2BW, United Kingdom
  • 2School of Mathematics and Physics, Queen’s University Belfast, Belfast BT7 1NN, United Kingdom
  • 3Department of Physics and Astronomy, University College London, Gower Street, London WC1E 6BT, United Kingdom

  • *tommaso.tufarelli@gmail.com

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Issue

Vol. 112, Iss. 13 — 4 April 2014

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