Single-photon quantum-nondemolition detectors constructed with linear optics and projective measurements

By Pieter Kok, Hwang Lee, Jonathan P. Dowling. 2002

145 citations recorded by the source corpus.

Optical quantum-nondemolition devices can provide essential tools for quantum information processing. Here, we describe several optical interferometers that signal the presence of a single photon in a particular input state without destroying it. We discuss both entanglement-assisted and nonentanglement-assisted interferometers, with ideal and realistic detectors. We found that the existing detectors with 88% quantum efficiency and single-photon resolution can yield output fidelities of up to 89%, depending on the input state. Furthermore, we construct expanded protocols to perform quantum-nondemolition detections of single photons that leave the polarization invariant. For detectors with 88% efficiency, we found polarization-preserving output fidelities of up to 98.5%.

Subfields: Artificial Intelligence, Atomic and Molecular Physics, and Optics

View Paper: https://www.semanticscholar.org/paper/87c8edf627211d7e529c278af2d4c66bf8bffe87

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In Artificial Intelligence

In Atomic and Molecular Physics, and Optics

Citations in the corpus

Linear optical quantum computing with photonic qubits (2005, background): “Several schemes for single-photon QND measurements have been proposed, either with linear optics (Howell and Yeazell 2000a; Kok et al. 2002), optical quantum relays (Jacobs et al. 2002), or other implementations (Brune et al. 1990; Brune et al. 1992; Roch et al. 1997; Munro et al. 2005).”