Four-dimensionally multiplexed eight-state continuous-variable quantum key distribution over turbulent channels

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12 Citations (Scopus)

Abstract

We experimentally demonstrate an eight-state continuous-variable quantum key distribution (CV-QKD) over atmospheric turbulence channels. The high secret key rate (SKR) is enabled by four-dimensional multiplexing of 96 channels, i.e., 6-channel wavelength-division multiplexing, 4-channel orbital angular momentum multiplexing, 2-channel polarization multiplexing, and 2-channel spatial-position multiplexing. The atmospheric turbulence channel is emulated by a spatial light modulator (SLM) on which a series of azimuthal phase patterns yielding Andrews’ spectrum are recorded. A commercial coherent receiver is implemented at Bob’s side, followed by a phase noise cancellation (PNC) stage, where channel transmittance can be monitored accurately and phase noise can be effectively eliminated. Compared to four-state CV-QKD, eight-state CV-QKD protocol potentially provides a better performance by offering higher SKR, better excess noise tolerance, and longer secure transmission distance. In our proposed CV-QKD system, the minimum transmittances of 0.24 and 0.26 are required for OAM states of 2 (or -2) and 6 (or -6), respectively, to guarantee the secure transmission. A maximum SKR of 3.744 Gb/s is experimentally achievable, while a total SKR of 960 Mb/s can be obtained in case of mean channel transmittances.

Original languageEnglish (US)
JournalIEEE Photonics Journal
DOIs
StateAccepted/In press - Nov 22 2017

Fingerprint

Quantum cryptography
Multiplexing
Atmospheric turbulence
Phase noise
multiplexing
Angular momentum
transmittance
Wavelength division multiplexing
atmospheric turbulence
Polarization
noise tolerance
wavelength division multiplexing
light modulators
cancellation
angular momentum
receivers
orbitals

Keywords

  • Continuous-variable quantum key distribution
  • discrete modulation
  • free-space optical communication
  • Modulation
  • multiplexing
  • Optical attenuators
  • Phase noise
  • Protocols
  • Receivers
  • Wavelength division multiplexing

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Electrical and Electronic Engineering

Cite this

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title = "Four-dimensionally multiplexed eight-state continuous-variable quantum key distribution over turbulent channels",
abstract = "We experimentally demonstrate an eight-state continuous-variable quantum key distribution (CV-QKD) over atmospheric turbulence channels. The high secret key rate (SKR) is enabled by four-dimensional multiplexing of 96 channels, i.e., 6-channel wavelength-division multiplexing, 4-channel orbital angular momentum multiplexing, 2-channel polarization multiplexing, and 2-channel spatial-position multiplexing. The atmospheric turbulence channel is emulated by a spatial light modulator (SLM) on which a series of azimuthal phase patterns yielding Andrews’ spectrum are recorded. A commercial coherent receiver is implemented at Bob’s side, followed by a phase noise cancellation (PNC) stage, where channel transmittance can be monitored accurately and phase noise can be effectively eliminated. Compared to four-state CV-QKD, eight-state CV-QKD protocol potentially provides a better performance by offering higher SKR, better excess noise tolerance, and longer secure transmission distance. In our proposed CV-QKD system, the minimum transmittances of 0.24 and 0.26 are required for OAM states of 2 (or -2) and 6 (or -6), respectively, to guarantee the secure transmission. A maximum SKR of 3.744 Gb/s is experimentally achievable, while a total SKR of 960 Mb/s can be obtained in case of mean channel transmittances.",
keywords = "Continuous-variable quantum key distribution, discrete modulation, free-space optical communication, Modulation, multiplexing, Optical attenuators, Phase noise, Protocols, Receivers, Wavelength division multiplexing",
author = "Zhen Qu and Djordjevic, {Ivan B}",
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doi = "10.1109/JPHOT.2017.2777261",
language = "English (US)",
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AU - Qu, Zhen

AU - Djordjevic, Ivan B

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N2 - We experimentally demonstrate an eight-state continuous-variable quantum key distribution (CV-QKD) over atmospheric turbulence channels. The high secret key rate (SKR) is enabled by four-dimensional multiplexing of 96 channels, i.e., 6-channel wavelength-division multiplexing, 4-channel orbital angular momentum multiplexing, 2-channel polarization multiplexing, and 2-channel spatial-position multiplexing. The atmospheric turbulence channel is emulated by a spatial light modulator (SLM) on which a series of azimuthal phase patterns yielding Andrews’ spectrum are recorded. A commercial coherent receiver is implemented at Bob’s side, followed by a phase noise cancellation (PNC) stage, where channel transmittance can be monitored accurately and phase noise can be effectively eliminated. Compared to four-state CV-QKD, eight-state CV-QKD protocol potentially provides a better performance by offering higher SKR, better excess noise tolerance, and longer secure transmission distance. In our proposed CV-QKD system, the minimum transmittances of 0.24 and 0.26 are required for OAM states of 2 (or -2) and 6 (or -6), respectively, to guarantee the secure transmission. A maximum SKR of 3.744 Gb/s is experimentally achievable, while a total SKR of 960 Mb/s can be obtained in case of mean channel transmittances.

AB - We experimentally demonstrate an eight-state continuous-variable quantum key distribution (CV-QKD) over atmospheric turbulence channels. The high secret key rate (SKR) is enabled by four-dimensional multiplexing of 96 channels, i.e., 6-channel wavelength-division multiplexing, 4-channel orbital angular momentum multiplexing, 2-channel polarization multiplexing, and 2-channel spatial-position multiplexing. The atmospheric turbulence channel is emulated by a spatial light modulator (SLM) on which a series of azimuthal phase patterns yielding Andrews’ spectrum are recorded. A commercial coherent receiver is implemented at Bob’s side, followed by a phase noise cancellation (PNC) stage, where channel transmittance can be monitored accurately and phase noise can be effectively eliminated. Compared to four-state CV-QKD, eight-state CV-QKD protocol potentially provides a better performance by offering higher SKR, better excess noise tolerance, and longer secure transmission distance. In our proposed CV-QKD system, the minimum transmittances of 0.24 and 0.26 are required for OAM states of 2 (or -2) and 6 (or -6), respectively, to guarantee the secure transmission. A maximum SKR of 3.744 Gb/s is experimentally achievable, while a total SKR of 960 Mb/s can be obtained in case of mean channel transmittances.

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