Continuous-variable quantum key distribution with non-Gaussian quantum catalysis

Guo, Ying; Ye, Wei; Zhong, Hai; Liao, Qin

doi:10.1103/physreva.99.032327

Cited by 109 publications

(57 citation statements)

References 53 publications

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“…Note that despite the absolute device security of MDI-QKD, its transmission distance is unsatisfactory, and thus it is difficult to be implemented in harsh environments like seawater. Fortunately, to lengthen the transmission distance, the non-Gaussian operations [ 22 ] like single photon subtraction (SPS) [ 23 ] and zero-photon catalysis (ZPC) [ 24 ] are the most commonly used means. One article has put forward a plan of operating single photon subtraction (SPS) in the fiber-based CVQKD [ 25 ].…”

Section: Introductionmentioning

confidence: 99%

Improving Underwater Continuous-Variable Measurement-Device-Independent Quantum Key Distribution via Zero-Photon Catalysis

Wang

Zou

Mao

et al. 2020

Entropy

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Underwater quantumkey distribution (QKD) is tough but important formodern underwater communications in an insecure environment. It can guarantee secure underwater communication between submarines and enhance safety for critical network nodes. To enhance the performance of continuous-variable quantumkey distribution (CVQKD) underwater in terms ofmaximal transmission distance and secret key rate as well, we adopt measurement-device-independent (MDI) quantum key distribution with the zero-photon catalysis (ZPC) performed at the emitter of one side, which is the ZPC-based MDI-CVQKD. Numerical simulation shows that the ZPC-involved scheme, which is a Gaussian operation in essence, works better than the single photon subtraction (SPS)-involved scheme in the extreme asymmetric case. We find that the transmission of the ZPC-involved scheme is longer than that of the SPS-involved scheme. In addition, we consider the effects of temperature, salinity and solar elevation angle on the system performance in pure seawater. The maximal transmission distance decreases with the increase of temperature and the decrease of sunlight elevation angle, while it changes little over a broad range of salinity

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Section: Introductionmentioning

confidence: 99%

Improving Underwater Continuous-Variable Measurement-Device-Independent Quantum Key Distribution via Zero-Photon Catalysis

Wang

Zou

Mao

et al. 2020

Entropy

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“…The dealer achieves {x h , p h } by measuring the amplitude and phase quadratures of the end quantum state via double homodyne detection. [32]. All participants abandon the disclosed data.…”

Section: The Gmcs-involved (T N) Scheme For Cvqssmentioning

confidence: 99%

Improving Continuous Variable Quantum Secret Sharing with Weak Coherent States

et al. 2020

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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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“…Currently, photon catalysis (PC) [21][22][23][24], which is a kind of non-Gaussian operations in essence, has been demonstrated to extend the transmission distance of the CVQKD system due to the fact that a suitable photon catalyzing operation would increase the entanglement degree of the entangled system and thereby increase the correlation between two output modes of the states [21]. Since the entanglement-based (EB) CVQKD is equivalent to the prepare-and-measure (PM) one, this operation can be implemented in practical protocols using coherent states with existing technologies.…”

Section: Introductionmentioning

confidence: 99%

Discrete Modulation Source Enhancement for Continuous Variable Quantum Key Distribution through Photon Catalyzing

Zhou¹,

Zou²,

Mao³

et al. 2020

Preprint

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Establishing global high-rate secure communications is a potential application of continuous-variable quantum key distribution (CVQKD) but also challenging for long-distance transmissions in metropolitan areas. The discrete modulation(DM) can make up for the shortage of transmission distance that has a unique advantage against all side-channel attacks, however its further performance improvement requires source preparation in the presence of noise and loss. Here, we consider the effects of photon catalysis (PC) on the DM-involved source preparation for lengthening the maximal transmission distance of the CVQKD system. We address a zero-photon catalysis (ZPC)-based source preparation for enhancing the DM-CVQKD system. The statistical fluctuation due to the finite length of data is taken into account for the practical security analysis. Numerical simulations show that the ZPC-based DM-CVQKD system can not only achieve the extended maximal transmission distance, but also contributes to the reasonable increase of the secret key rate. This approach enables the DM-CVQKD to tolerate lower reconciliation efficiency, which may promote the practical implementation solutions compatible with classical optical communications using state-of-the-art technology.

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Continuous-variable quantum key distribution with non-Gaussian quantum catalysis

Cited by 109 publications

References 53 publications

Improving Underwater Continuous-Variable Measurement-Device-Independent Quantum Key Distribution via Zero-Photon Catalysis

Improving Underwater Continuous-Variable Measurement-Device-Independent Quantum Key Distribution via Zero-Photon Catalysis

Improving Continuous Variable Quantum Secret Sharing with Weak Coherent States

Discrete Modulation Source Enhancement for Continuous Variable Quantum Key Distribution through Photon Catalyzing

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