Adaptive Quantum Nondemolition Measurement of a Photon Number

B. Peaudecerf, T. Rybarczyk, S. Gerlich, S. Gleyzes, J. M. Raimond, S. Haroche, I. Dotsenko, and M. Brune
Phys. Rev. Lett. 112, 080401 – Published 26 February 2014

Abstract

In many quantum measurements, information is acquired incrementally by the successive interaction of meters with the measured system. Adaptive measurements minimize the use of resources (meters) by adjusting the measurement settings according to available information. We demonstrate an adaptive measurement for nondestructive photon counting in a cavity, based on Ramsey interferometry for Rydberg atoms interacting with the field. Tuning the interferometer in real time, we speed up the measurement by up to 45%. Such adaptive methods are promising for quantum metrology, state preparation, and feedback.

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  • Received 25 September 2013

DOI:https://doi.org/10.1103/PhysRevLett.112.080401

© 2014 American Physical Society

Authors & Affiliations

B. Peaudecerf1, T. Rybarczyk1, S. Gerlich1, S. Gleyzes1, J. M. Raimond1, S. Haroche1,2, I. Dotsenko1,2,*, and M. Brune1,2

  • 1Laboratoire Kastler Brossel, ENS, UPMC-Paris 6, CNRS, Collège de France, 24 rue Lhomond, 75005 Paris, France
  • 2Collège de France, 11 place Marcelin Berthelot, 75005 Paris, France

  • *igor.dotsenko@lkb.ens.fr

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Vol. 112, Iss. 8 — 28 February 2014

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