Algorithm for State-of-Polarization Generation in Polarization-Encoding Quantum Key Distribution

In this work, the results of quantum key distribution through an urban fiber communication line with a length of 30.6[Formula: see text]km and losses of 11.7[Formula: see text]dB, obtained by both phase and polarization encoding-based devices, are presented. For phase encoding, a two-pass auto-compensating optical scheme, commonly called “plug&play”, was used. For polarization encoding, a self-developed unconventional optical scheme was made. A continuous key distribution with a sifted key generation rate of 1.0[Formula: see text]kbit/s and a quantum bit error rate of 5.7% was implemented when using “plug&play” device, whereas 0.1[Formula: see text]kbit/s and 5.5% was observed when using one with polarization encoding. The features and conveniences of both implementations are discussed.

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Intrinsically stable phase-modulated polarization encoding system for quantum key distribution

Physics Letters A ◽

10.1016/j.physleta.2008.10.081 ◽

2008 ◽

Vol 373 (1) ◽

pp. 54-57 ◽

Cited By ~ 3

Author(s):

Xiaobao Liu ◽

Changjun Liao ◽

Jinglong Mi ◽

Jindong Wang ◽

Songhao Liu

Keyword(s):

Quantum Key Distribution ◽

Key Distribution ◽

Stable Phase ◽

Polarization Encoding

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Experimental demonstration of polarization encoding quantum key distribution system based on intrinsically stable polarization-modulated units

Optics Express ◽

10.1364/oe.24.008302 ◽

2016 ◽

Vol 24 (8) ◽

pp. 8302 ◽

Cited By ~ 10

Author(s):

Jindong Wang ◽

Xiaojuan Qin ◽

Yinzhu Jiang ◽

Xiaojing Wang ◽

Liwei Chen ◽

...

Keyword(s):

Distribution System ◽

Quantum Key Distribution ◽

Key Distribution ◽

Experimental Demonstration ◽

Polarization Encoding

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Semi-quantum key distribution protocol based on the hyperentanglement Bell state of polarization-spatial mode

Modern Physics Letters B ◽

10.1142/s0217984920503534 ◽

2020 ◽

Vol 34 (31) ◽

pp. 2050353

Author(s):

Ling Xu

Keyword(s):

Quantum Key Distribution ◽

High Capacity ◽

Bell State ◽

Key Distribution ◽

Degree Of Freedom ◽

Bell States ◽

Spatial Mode ◽

Security Systems ◽

State Of Polarization ◽

Quantum Key Distribution Protocol

The semi-quantum key distribution protocol based on the hyperentanglement Bell state of polarization-spatial mode is presented in this paper. This protocol is utilized to share the session keys and construct key hierarchy of security systems in high capacity between the legitimate users securely. Different from the previous protocols, two quantum non-demolition detectors are constructed with cross-Kerr nonlinearities and different phase shifts for distinguishing the Bell states in spatial mode degree of freedom. Meanwhile, this protocol can improve the capacity and efficiency when the legitimate users share the session keys. And the technology of the hyperentanglement purification and hyperentanglement concentration can enhance the robustness and stability of this protocol. At last, this protocol proposed in this paper can withstand several kinds of attacks.

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