Real-time quantum feedback prepares and stabilizes photon number states

Clément Sayrin, Igor Dotsenko, Xingxing Zhou, Bruno Peaudecerf, Théo Rybarczyk, Sébastien Gleyzes, Pierre Rouchon, Mazyar Mirrahimi, Hadis Amini, Michel Brune, Jean-Michel Raimond and Serge Haroche ()
Additional contact information
Clément Sayrin: Laboratoire Kastler Brossel, ENS, UPMC–Paris 6, CNRS, 24 rue Lhomond
Igor Dotsenko: Laboratoire Kastler Brossel, ENS, UPMC–Paris 6, CNRS, 24 rue Lhomond
Xingxing Zhou: Laboratoire Kastler Brossel, ENS, UPMC–Paris 6, CNRS, 24 rue Lhomond
Bruno Peaudecerf: Laboratoire Kastler Brossel, ENS, UPMC–Paris 6, CNRS, 24 rue Lhomond
Théo Rybarczyk: Laboratoire Kastler Brossel, ENS, UPMC–Paris 6, CNRS, 24 rue Lhomond
Sébastien Gleyzes: Laboratoire Kastler Brossel, ENS, UPMC–Paris 6, CNRS, 24 rue Lhomond
Pierre Rouchon: Centre Automatique et Systèmes, Mathématiques et Systèmes, Mines ParisTech, 60 Boulevard Saint-Michel
Mazyar Mirrahimi: INRIA Paris-Rocquencourt, Domaine de Voluceau, BP 105
Hadis Amini: Centre Automatique et Systèmes, Mathématiques et Systèmes, Mines ParisTech, 60 Boulevard Saint-Michel
Michel Brune: Laboratoire Kastler Brossel, ENS, UPMC–Paris 6, CNRS, 24 rue Lhomond
Jean-Michel Raimond: Laboratoire Kastler Brossel, ENS, UPMC–Paris 6, CNRS, 24 rue Lhomond
Serge Haroche: Laboratoire Kastler Brossel, ENS, UPMC–Paris 6, CNRS, 24 rue Lhomond

Nature, 2011, vol. 477, issue 7362, 73-77

Abstract: Quantum feedback Feedback loops are central to most classical control procedures. Generalizing this approach to quantum states is complicated by the fact that sensor measurements of the output cause a random back-action on the system. Serge Haroche and colleagues overcome this problem using weak measurements, demonstrating a real-time, stabilizing quantum feedback scheme. In this system, information about the photon number is obtained from a weak quantum non-demolition measurement of the field state with Rydberg atoms crossing the cavity one by one. This represents a significant step towards the implementation of complex quantum information operations.

Date: 2011
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DOI: 10.1038/nature10376

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