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Removal of a single photon by adaptive absorption

Calsamiglia, John and Barnett, Stephen M. and Lütkenhaus, Norbert and Suominen, Kalle-Antti (2001) Removal of a single photon by adaptive absorption. Physical Review A, 64 (4). 043814-1. ISSN 1094-1622

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We present a method to remove, using only linear optics, exactly one photon from a field mode. This is achieved by putting the system in contact with an absorbing environment, which is under continuous monitoring. A feedback mechanism then decouples the system from the environment as soon as the first photon is absorbed. We propose a possible scheme to implement this process and provide the theoretical tools to describe it.