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

Journal Article · Sun Dec 01 04:00:00 EST 2002 · Physical Review. A

DOI:https://doi.org/10.1103/PhysRevA.66.063814· OSTI ID:20632492

Kok, Pieter; Lee, Hwang; Dowling, Jonathan P ^[1]

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1. Quantum Computing Technologies Group, Section 367, Jet Propulsion Laboratory, California Institute of Technology, Mail Stop 126-347, 4800 Oak Grove Drive, Pasadena, California 91109 (United States)

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%.

• OSTI ID: 20632492
• Journal Information: Physical Review. A, Journal Name: Physical Review. A Journal Issue: 6 Vol. 66; ISSN 1050-2947; ISSN PLRAAN
• Country of Publication: United States
• Language: English

Related Subjects

74 ATOMIC AND MOLECULAR PHYSICS
DATA PROCESSING
INFORMATION THEORY
INTERFEROMETERS
OPTICS
PHOTODETECTORS
PHOTONS
POLARIZATION
QUANTUM EFFICIENCY
QUANTUM MECHANICS
RESOLUTION
VISIBLE RADIATION
YIELDS