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物理学前沿：英文版

Continuous variable quantum communication with bright entangled optical beams

Changde Xie, Jing Zhang, Qing Pan, Xiaojun Jia, Kunchi Peng

Published Oct 29, 2006• 4 citations
Publisher
DOI
10.1007/s11467-006-0049-1

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•Apr 18, 2006•4 citations
Bright three-color continuous-variable (CV) entanglement generated by a cascaded sum-frequency process in an optical cavity is investigated. The second- and fourth-harmonic beams can be generated by two quasi-phase-matched cascaded sum-frequency processes in a quasi-periodic optical superlattice. Quantum correlations among the fundamental and second- and fourth-harmonic beams are calculated and discussed by applying a sufficient and necessary inseparability criterion for CV three-mode entanglement. Strong three-color CV entanglement beams with a double frequency interval can be produced in this simple system. It is experimentally feasible and may be very useful for applications in quantum communication and computation networks.
Summary form only given. Recently, a scheme for the generation of bright entangled beams has been suggested. The EPR-like quantum correlations are produced by letting two amplitude-squeezed bright optical fields interfere on a 50:50 beamsplitter. The phase (PM) and amplitude (AM) uncertainty measurements exhibit strong correlations and anticorrelations which can be detected by recording the difference (sum) of the PM (AM) photocurrents. In this paper we present a simple version of the quantum key distribution protocol. We believe that the suggested scheme provides an efficient and novel approach to continuous variable quantum communication.
We observed continuous-variable entanglement between two bright beams emitted above threshold by a phase-difference-locked ultrastable optical parametric oscillator. The amplitude-difference squeezing is -3 dB and the phase-sum one is -1.35 dB. The beams are classically phase-locked at a frequency difference of 161.8273240(5) MHz, continuously tunable by the OPO crystal temperature. Such unprecedented frequency-difference stability paves the way for implementing quantum frequency multiplexing and CV quantum information in the frequency domain.