Plug-and-play unidimensional continuous-variable quantum key distribution

Zhang, Hang; Ruan, Xinchao; Zhang, Ling; Guo, Ying

doi:10.1007/s11128-019-2241-6

Cited by 7 publications

(2 citation statements)

References 52 publications

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“…In this link structure, it is necessary to ensure accurate orientation between the sender and the receiver, so that the receiver can detect the light beam propagating along the direction of the transmitter. Feedback link can be viewed as a plug-and-play configuration [27,28], in which the signal light emitted by the sender is incident on a mirror, such as a Faraday mirror, and the receiver modulates the received signal light. The quantum information is then loaded onto the reflected light and fed back to the sender via the reverse channel.…”

Section: Description Of the Discrete-modulated Underwater Cv-qkdmentioning

confidence: 99%

Security Analysis of Discrete-Modulated Continuous-Variable Quantum Key Distribution over Seawater Channel

et al. 2019

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We investigate the optical absorption and scattering properties of four different kinds of seawater as the quantum channel. The models of discrete-modulated continuous-variable quantum key distribution (CV-QKD) in free-space seawater channel are briefly described, and the performance of the four-state protocol and the eight-state protocol in asymptotic and finite-size cases is analyzed in detail. Simulation results illustrate that the more complex is the seawater composition, the worse is the performance of the protocol. For different types of seawater channels, we can improve the performance of the protocol by selecting different optimal modulation variances and controlling the extra noise on the channel. Besides, we can find that the performance of the eight-state protocol is better than that of the four-state protocol, and there is little difference between homodyne detection and heterodyne detection. Although the secret key rate of the protocol that we propose is still relatively low and the maximum transmission distance is only a few hundred meters, the research on CV-QKD over the seawater channel is of great significance, which provides a new idea for the construction of global secure communication network.

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Section: Description Of the Discrete-modulated Underwater Cv-qkdmentioning

confidence: 99%

Security Analysis of Discrete-Modulated Continuous-Variable Quantum Key Distribution over Seawater Channel

et al. 2019

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“…In the PP DPMCS scheme, LO is generated by Alice without transmitting through the quantum channel, whereas quantum state is modulated by Bob based on the classical light sent from the source of Alice [39]. Therefore, the loophole resulting from transmitting LO is closed, and the polarization drift of the fiber channel would be compensated automatically [41,42]. However, the transmission of the classical light from Alice to Bob still results in extra excess noise [43] that would reduce the maximum transmission distance.…”

Section: Introductionmentioning

confidence: 99%

Photon Subtraction-Induced Plug-and-Play Scheme for Enhancing Continuous-Variable Quantum Key Distribution with Discrete Modulation

Zou

Mao

et al. 2020

Applied Sciences

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Establishing high-rate secure communications is a potential application of continuous-variable quantum key distribution (CVQKD) but still challenging for the long-distance transmission technology compatible with modern optical communication systems. Here, we propose a photon subtraction-induced plug-and-play scheme for enhancing CVQKD with discrete-modulation (DM), avoiding the traditional loopholes opened by the transmission of local oscillator. A photon subtraction operation is involved in the plug-and-play scheme for detection while resisting the extra untrusted source noise of the DM-CVQKD system. We analyze the relationship between secret key rate, channel losses, and untrusted source noise. The simulation result shows that the photon-subtracted scheme enhances the performance in terms of the maximal transmission distance and make up for the deficiency of the original system effectively. Furthermore, we demonstrate the influence of finite-size effect on the secret key rate which is close to the practical implementation.

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Unidimensional Continuous-variable Quantum Key Distribution Based on Basis-encoding Coherent States Protocol

Guo

Zhao

et al. 2020

Int J Theor Phys

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Plug-and-play unidimensional continuous-variable quantum key distribution

Cited by 7 publications

References 52 publications

Security Analysis of Discrete-Modulated Continuous-Variable Quantum Key Distribution over Seawater Channel

Security Analysis of Discrete-Modulated Continuous-Variable Quantum Key Distribution over Seawater Channel

Photon Subtraction-Induced Plug-and-Play Scheme for Enhancing Continuous-Variable Quantum Key Distribution with Discrete Modulation

Unidimensional Continuous-variable Quantum Key Distribution Based on Basis-encoding Coherent States Protocol

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