Abstract
Motivated by the dense coding and teleportation of two-mode squeezed vacuum (TMSV) state, a continuous-variable arbitrated quantum signature (CV-AQS) scheme is proposed. The signer Alice generates the signature by the dense coding and sends it to the verifier Bob. The measurement results of two quadrature components serve for the recovery of the secret message. With the help of the arbitrator Charlie, Bob verifies the validity of the signature. The security of the presented protocol is protected by the calculation of the fidelity parameter and the implementation process of two-mode squeezed vacuum (TMSV) state teleportation. Moreover, the proposed scheme can be correctly implemented in the lossy and lossless transmission with a higher capacity.
Highlights
Digital signature is a basic algorithm of classical cryptography, which is widely applied in e-commerce and e-government
Many signature protocols based on the structure of arbitrated quantum signature (AQS) have been studied by scholars
Inspired by the characteristics of the dense coding and teleportation of quantum two-mode squeezed vacuum (TMSV) states [35], [36], we propose a continuous-variable arbitrated quantum signature (CV-AQS) scheme
Summary
Digital signature is a basic algorithm of classical cryptography, which is widely applied in e-commerce and e-government. Zeng et al [3] proposed an arbitrated quantum signature (AQS) based on GreenbergerHorne-Zeilinger (GHZ) state in 2002. It avoids the ‘‘no-go theorem of quantum signatures’’ and has been proved to be theoretically feasible. The CV quantum cryptography scheme is implemented by applying the amplitude and the phase quadrature components of optical modes It could transmit information with higher efficiency compared with DV quantum states. Inspired by the characteristics of the dense coding and teleportation of quantum two-mode squeezed vacuum (TMSV) states [35], [36], we propose a CV-AQS scheme. The principle of the dense coding and quantum teleportation based on TMSV state is described.
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