Nondestructive Photon Detection The click of a photon detector is the usual method for detecting a photon and can be sufficiently sensitive to detect even a single photon. Such a detection process is, however, destructive—the photon is annihilated. Reiserer et al. (p. 1349, published online 14 November) describe an experimental system capable of detecting a single photon without destroying it. An atom in a cavity can be used for the nondestructive detection of optical photons. All optical detectors to date annihilate photons upon detection, thus excluding repeated measurements. Here, we demonstrate a robust photon detection scheme that does not rely on absorption. Instead, an incoming photon is reflected from an optical resonator containing a single atom prepared in a superposition of two states. The reflection toggles the superposition phase, which is then measured to trace the photon. Characterizing the device with faint laser pulses, a single-photon detection efficiency of 74% and a survival probability of 66% are achieved. The efficiency can be further increased by observing the photon repeatedly. The large single-photon nonlinearity of the experiment should enable the development of photonic quantum gates and the preparation of exotic quantum states of light.
Nondestructive Detection of an Optical Photon
A. Reiserer,S. Ritter,G. Rempe
Published 2013 in Science
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- Publication year
2013
- Venue
Science
- Publication date
2013-11-14
- Fields of study
Medicine, Physics
- Identifiers
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Semantic Scholar, PubMed
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