Intrinsic quantum correlations of weak coherent states for quantum communication

Journal Article · Tue Mar 15 04:00:00 EDT 2011 · Physical Review. A

DOI:https://doi.org/10.1103/PHYSREVA.83.030302· OSTI ID:21537353

Yongmeng, Sua; Scanlon, Erin; Beaulieu, Travis; Bollen, Viktor; Lee, Kim Fook ^[1]

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1. Department of Physics, Michigan Technological University, Houghton, Michigan 49931 (United States)

Intrinsic quantum correlations of weak coherent states are observed between two parties through a novel detection scheme, which can be used as a supplement to the existence decoy-state Bennett-Brassard 1984 protocol and the differential phase-shift quantum key distribution (DPS-QKD) protocol. In a proof-of-principle experiment, we generate bipartite correlations of weak coherent states using weak local oscillator fields in two spatially separated balanced homodyne detections. We employ a nonlinearity of postmeasurement method to obtain the bipartite correlations from two single-field interferences at individual homodyne measurements. This scheme is then used to demonstrate bits correlations between two parties over a distance of 10 km through a transmission fiber. We believe that the scheme can add another physical layer of security to these protocols for quantum key distribution.

• OSTI ID: 21537353
• Journal Information: Physical Review. A, Journal Name: Physical Review. A Journal Issue: 3 Vol. 83; ISSN 1050-2947; ISSN PLRAAN
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ANNIHILATION OPERATORS
COMMUNICATIONS
CORRELATIONS
CRYPTOGRAPHY
EIGENSTATES
ELECTRONIC EQUIPMENT
EQUIPMENT
FIBERS
INFORMATION
INTERFERENCE
MATHEMATICAL OPERATORS
NONLINEAR PROBLEMS
OSCILLATORS
PHASE SHIFT
QUANTUM CRYPTOGRAPHY
QUANTUM INFORMATION
QUANTUM OPERATORS