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Nature Photonics 2, 268–269 (1 May 2008) | doi:10.1038/nphoton.2008.59

Quantum optics: Beyond single-photon counting

Alexander V. Sergienko

Optical quantum information processing is at the frontier of modern physics and optics. It is a topic that relies heavily on manipulating single-photon states: exciting experimental applications, such as quantum cryptography, entanglement swapping and quantum-state teleportation, would be impossible without single-photon-counting detectors.