Practical high-speed light source for decoy-state quantum key distribution

With heralded pair coherent states (HPCS), orbital angular momentum (OAM) states and pulse position modulation (PPM) technology, a decoy-state measurement-device-independent quantum key distribution (MDI-QKD) protocol is proposed. OAM states and PPM technology are used to realize the coding of the signal states in the HPCS light source. The use of HPCS light source, OAM coding and PPM coding cannot only reduce the error rate but also improve the key generation rate and communication distance. The new MDI-QKD protocol also employs three-intensity decoy states to avoid the attacks against the light source. By calculating the error rate and key generation rate, the performance of the MDI-QKD protocol is analyzed. Numerical simulation shows that the protocol has very low error rate and very high key generation rate. Moreover, the maximum communication distance can reach 455 km.

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Decoy-state quantum key distribution with practical light source

Acta Physica Sinica ◽

10.7498/aps.60.110303 ◽

2011 ◽

Vol 60 (11) ◽

pp. 110303

Author(s):

Jiao Rong-Zhen ◽

Zhang Chao ◽

Ma Hai-Qiang

Keyword(s):

Light Source ◽

Quantum Key Distribution ◽

Key Distribution ◽

Decoy State

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Practical non-Poissonian light source for passive decoy state quantum key distribution

Optics Letters ◽

10.1364/ol.35.003393 ◽

2010 ◽

Vol 35 (20) ◽

pp. 3393 ◽

Cited By ~ 6

Author(s):

Yang Zhang ◽

Wei Chen ◽

Shuang Wang ◽

Zhen-Qiang Yin ◽

Fang-Xing Xu ◽

...

Keyword(s):

Light Source ◽

Quantum Key Distribution ◽

Key Distribution ◽

Decoy State

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Intensity modulator for secure, stable, and high-performance decoy-state quantum key distribution

npj Quantum Information ◽

10.1038/s41534-021-00418-x ◽

2021 ◽

Vol 7 (1) ◽

Author(s):

Feng-Yu Lu ◽

Xing Lin ◽

Shuang Wang ◽

Guan-Jie Fan-Yuan ◽

Peng Ye ◽

...

Keyword(s):

Quantum Key Distribution ◽

High Speed ◽

High Performance ◽

Key Distribution ◽

Experimental Result ◽

Modulation Method ◽

Decoy State ◽

Intensity Modulator ◽

State Method ◽

Decoy State Method

AbstractThe decoy-state method substantially improves the performance of quantum key distribution (QKD) and perfectly solves crucial issues caused by multiphoton pulses. In recent years, the decoy-state method has occupied a key position in practicality, and almost all the QKD systems have employed the decoy-state method. However, the imperfections of traditional intensity modulators limit the performance of the decoy-state method and bring side channels. In this work, a special intensity modulator and its accompanying modulation method are designed and experimentally verified for the secure, stable, and high-performance decoy-state QKDs. The experimental result indicates that its stable and adjustable intensities, convenient two-level modulation, inherently high speed, and compact structure is extremely fit for future trends and will help the decoy-state method to be perfectly applied to QKD systems.

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Security of quantum key distribution with intensity correlations

Quantum ◽

10.22331/q-2021-12-07-602 ◽

2021 ◽

Vol 5 ◽

pp. 602

Author(s):

Víctor Zapatero ◽

Álvaro Navarrete ◽

Kiyoshi Tamaki ◽

Marcos Curty

Keyword(s):

Quantum Key Distribution ◽

High Speed ◽

Single Photon ◽

Security Analysis ◽

Key Distribution ◽

Necessary Condition ◽

Secret Key ◽

General Technique ◽

Decoy State ◽

Maximum Relative Deviation

The decoy-state method in quantum key distribution (QKD) is a popular technique to approximately achieve the performance of ideal single-photon sources by means of simpler and practical laser sources. In high-speed decoy-state QKD systems, however, intensity correlations between succeeding pulses leak information about the users' intensity settings, thus invalidating a key assumption of this approach. Here, we solve this pressing problem by developing a general technique to incorporate arbitrary intensity correlations to the security analysis of decoy-state QKD. This technique only requires to experimentally quantify two main parameters: the correlation range and the maximum relative deviation between the selected and the actually emitted intensities. As a side contribution, we provide a non-standard derivation of the asymptotic secret key rate formula from the non-asymptotic one, in so revealing a necessary condition for the significance of the former.

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Novel High-Speed Polarization Source for Decoy-State BB84 Quantum Key Distribution Over Free Space and Satellite Links

Journal of Lightwave Technology ◽

10.1109/jlt.2013.2249040 ◽

2013 ◽

Vol 31 (9) ◽

pp. 1399-1408 ◽

Cited By ~ 10

Author(s):

Zhizhong Yan ◽

Evan Meyer-Scott ◽

Jean-Philippe Bourgoin ◽

Brendon L. Higgins ◽

Nikolay Gigov ◽

...

Keyword(s):

Free Space ◽

Quantum Key Distribution ◽

High Speed ◽

Key Distribution ◽

Decoy State ◽

Satellite Links

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Measurement-device-independent quantum key distribution with leaky sources

Scientific Reports ◽

10.1038/s41598-021-81003-2 ◽

2021 ◽

Vol 11 (1) ◽

Author(s):

Weilong Wang ◽

Kiyoshi Tamaki ◽

Marcos Curty

Keyword(s):

Quantum Key Distribution ◽

Communication Systems ◽

Signal Transmission ◽

Information Leakage ◽

Key Distribution ◽

Time Frame ◽

Measurement Device ◽

Decoy State ◽

Unrealistic Assumption ◽

Measurement Device Independent

AbstractMeasurement-device-independent quantum key distribution (MDI-QKD) can remove all detection side-channels from quantum communication systems. The security proofs require, however, that certain assumptions on the sources are satisfied. This includes, for instance, the requirement that there is no information leakage from the transmitters of the senders, which unfortunately is very difficult to guarantee in practice. In this paper we relax this unrealistic assumption by presenting a general formalism to prove the security of MDI-QKD with leaky sources. With this formalism, we analyze the finite-key security of two prominent MDI-QKD schemes—a symmetric three-intensity decoy-state MDI-QKD protocol and a four-intensity decoy-state MDI-QKD protocol—and determine their robustness against information leakage from both the intensity modulator and the phase modulator of the transmitters. Our work shows that MDI-QKD is feasible within a reasonable time frame of signal transmission given that the sources are sufficiently isolated. Thus, it provides an essential reference for experimentalists to ensure the security of implementations of MDI-QKD in the presence of information leakage.

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