Passive state preparation in the Gaussian-modulated coherent-states quantum key distribution

Qi, Bing; Evans, Philip G.; Grice, Warren P.

doi:10.1103/PhysRevA.97.012317

Title: Passive state preparation in the Gaussian-modulated coherent-states quantum key distribution

Journal Article · Mon Jan 01 00:00:00 EST 2018 · Physical Review A

DOI:https://doi.org/10.1103/PhysRevA.97.012317· OSTI ID:1429187

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Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Tennessee, Knoxville, TN (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

In the Gaussian-modulated coherent-states (GMCS) quantum key distribution (QKD) protocol, Alice prepares quantum states actively: For each transmission, Alice generates a pair of Gaussian-distributed random numbers, encodes them on a weak coherent pulse using optical amplitude and phase modulators, and then transmits the Gaussian-modulated weak coherent pulse to Bob. Here we propose a passive state preparation scheme using a thermal source. In our scheme, Alice splits the output of a thermal source into two spatial modes using a beam splitter. She measures one mode locally using conjugate optical homodyne detectors, and transmits the other mode to Bob after applying appropriate optical attenuation. Under normal conditions, Alice's measurement results are correlated to Bob's, and they can work out a secure key, as in the active state preparation scheme. Given the initial thermal state generated by the source is strong enough, this scheme can tolerate high detector noise at Alice's side. Furthermore, the output of the source does not need to be single mode, since an optical homodyne detector can selectively measure a single mode determined by the local oscillator. Preliminary experimental results suggest that the proposed scheme could be implemented using an off-the-shelf amplified spontaneous emission source.

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Research Organization:: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1429187

Alternate ID(s):: OSTI ID: 1417076

Journal Information:: Physical Review A, Vol. 97, Issue 1; ISSN 2469-9926

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 23 works

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Passive-state preparation in continuous-variable measurement-device-independent quantum key distribution Bai, Dongyun; Huang, Peng; Ma, Hongxin Journal of Physics B: Atomic, Molecular and Optical Physics, Vol. 52, Issue 13 https://doi.org/10.1088/1361-6455/ab0b2a	journal	June 2019
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