scholarly journals Practical continuous-variable quantum secret sharing using plug-and-play dual-phase modulation

2022 ◽  
Author(s):  
qin liao ◽  
haijie liu ◽  
Yupeng Gong ◽  
zheng wang ◽  
qingquan peng ◽  
...  
Keyword(s):  
Secret Sharing ◽  
Phase Modulation ◽  
Quantum Secret Sharing ◽  
Continuous Variable ◽  
Dual Phase ◽  
Plug And Play

scholarly journals Continuous variable (2, 3) threshold quantum secret sharing schemes

2003 ◽  
Vol 5 ◽  
pp. 4-4 ◽  
Author(s):  
Andrew M Lance ◽  
Thomas Symul ◽  
Warwick P Bowen ◽  
Tomás Tyc ◽  
Barry C Sanders ◽  
...  
Keyword(s):  
Secret Sharing ◽  
Quantum Secret Sharing ◽  
Continuous Variable ◽  
Secret Sharing Schemes

scholarly journals Improving Continuous Variable Quantum Secret Sharing with Weak Coherent States

2020 ◽  
Vol 10 (7) ◽  
pp. 2411
Author(s):  
Yijun Wang ◽  
Bing Jia ◽  
Yun Mao ◽  
Xuelin Wu ◽  
Ying Guo
Keyword(s):  
Secret Sharing ◽  
Coherent States ◽  
Security Analysis ◽  
Quantum Secret Sharing ◽  
Continuous Variable ◽  
Quantum Systems ◽  
Phase Modulators ◽  
Security Proof ◽  
Optical Modes ◽  
Threshold Schemes

Quantum secret sharing (QSS) can usually realize unconditional security with entanglement of quantum systems. While the usual security proof has been established in theoretics, how to defend against the tolerable channel loss in practices is still a challenge. The traditional ( t , n ) threshold schemes are equipped in situation where all participants have equal ability to handle the secret. Here we propose an improved ( t , n ) threshold continuous variable (CV) QSS scheme using weak coherent states transmitting in a chaining channel. In this scheme, one participant prepares for a Gaussian-modulated coherent state (GMCS) transmitted to other participants subsequently. The remaining participants insert independent GMCS prepared locally into the circulating optical modes. The dealer measures the phase and the amplitude quadratures by using double homodyne detectors, and distributes the secret to all participants respectively. Special t out of n participants could recover the original secret using the Lagrange interpolation and their encoded random numbers. Security analysis shows that it could satisfy the secret sharing constraint which requires the legal participants to recover message in a large group. This scheme is more robust against background noise due to the employment of double homodyne detection, which relies on standard apparatuses, such as amplitude and phase modulators, in favor of its potential practical implementations.

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