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Quantum-to-Classical Transition of Single-Photon Detectors

Virginia D’Auria

Mercredi 6 octobre 2010

à 11h en salle C. Brot

Optical detectors play a central role in the development of future quantum technologies. Measurement-driven quantum information processing and state engineering critically rely on mastering the detection of single-photon states. To obtain a complete characterisation of a detector, a method for quantum detector tomography has been recently introduced and it provides a signature of the measurement device. Here, we experimentally demonstrate how this signature quantitatively evolves under external parameters, which drive the device away from the quantum regime. We illustrate this effect for two detectors : an avalanche photodiode and a two-channel time-multiplexing detector with photon-number resolution ability. This result highlights the quantum-to-classical transition of optical measurement devices. Moreover, we show how it translates to the heralded preparation of a target state, a paradigm for optical quantum information technology.