Gaussian-modulated coherent-state measurement-device-independent quantum key distribution

Ma, Xiang-Chun; Sun, Shi-Hai; Jiang, Mu-Sheng; Gui, Ming; Liang, Lin-Mei

doi:10.1103/physreva.89.042335

Cited by 96 publications

(51 citation statements)

References 42 publications

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“…The observed phase-noise variance is 0.04 (rad 2 ), which is small enough to enable secure key distribution. This technology also opens the door for other novel quantum communication protocols, such as the measurement-device-independent (MDI) CV-QKD protocol [25][26][27], where independent light sources are employed by different users. This paper is organized as follows: In Sec.…”

Section: Introductionmentioning

confidence: 99%

Generating the Local Oscillator “Locally” in Continuous-Variable Quantum Key Distribution Based on Coherent Detection

et al. 2015

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Continuous-variable quantum key distribution (CV-QKD) protocols based on coherent detection have been studied extensively in both theory and experiment. In all the existing implementations of CV-QKD, both the quantum signal and the local oscillator (LO) are generated from the same laser and propagate through the insecure quantum channel. This arrangement may open security loopholes and limit the potential applications of CV-QKD. In this paper, we propose and demonstrate a pilot-aided feedforward data recovery scheme that enables reliable coherent detection using a "locally" generated LO. Using two independent commercial laser sources and a spool of 25-km optical fiber, we construct a coherent communication system. The variance of the phase noise introduced by the proposed scheme is measured to be 0.04 (rad 2 ), which is small enough to enable secure key distribution. This technology also opens the door for other quantum communication protocols, such as the recently proposed measurement-device-independent CV-QKD, where independent light sources are employed by different users.

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Section: Introductionmentioning

confidence: 99%

Generating the Local Oscillator “Locally” in Continuous-Variable Quantum Key Distribution Based on Coherent Detection

et al. 2015

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“…There are cases when the two trusted QKD parties prepared quantum states while the measurement was conducted by a dishonest player, a scenario as in measurement-device-independent (MDI) QKD [46]. In these cases, the security proof and key rate formulas developed in CV MDI-QKD [47][48][49] could be applied directly. We remark that the existing schemes of CV MDI-QKD require a highly efficient homodyne detector and are more sensitive to channel losses.…”

Section: Discussionmentioning

confidence: 99%

Quantum secret sharing using weak coherent states

Grice

2019

Phys. Rev. A

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Secret sharing allows a trusted party (the dealer) to distribute a secret to a group of players, who can only access the secret cooperatively. Quantum secret sharing (QSS) protocols could provide unconditional security based on fundamental laws in physics. While the general security proof has been established recently in an entanglement-based QSS protocol, the tolerable channel loss is unfortunately rather small. Here we propose a continuous variable QSS protocol using conventional laser sources and homodyne detectors. In this protocol, a Gaussian-modulated coherent state (GMCS) prepared by one player passes through the secure stations of the other players sequentially, and each of the other players injects a locally prepared, independent GMCS into the circulating optical mode. Finally, the dealer measures both the amplitude and the phase quadratures of the receiving optical mode using double homodyne detectors. Collectively, the players can use their encoded random numbers to estimate the measurement results of the dealer and further generate a shared key. We prove the unconditional security of the proposed protocol against both eavesdroppers and dishonest players in the presence of high channel loss, and discuss various practical issues. a

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“…Finally, since HD blinding attack is a detector-based attack, MDI CV-QKD [55][56][57] can be a potential solution to defeat such attack. Although a proof-of-principle demonstration of MDI CV-QKD has been already performed in experiment [57], there is still a large gap between practical implementation and theoretical proposal.…”

Section: Countermeasuresmentioning

confidence: 99%

Homodyne-detector-blinding attack in continuous-variable quantum key distribution

et al. 2018

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We propose an efficient strategy to attack a continuous-variable quantum key distribution (CV-QKD) system, that we call homodyne detector blinding. This attack strategy takes advantage of a generic vulnerability of homodyne receivers: a bright light pulse sent on the signal port can lead to a saturation of the detector electronics. While detector saturation has already been proposed to attack CV-QKD, the attack we study in this paper has the additional advantage of not requiring an eavesdropper to be phase locked with the homodyne receiver. We show that under certain conditions, an attacker can use a simple laser, incoherent with the homodyne receiver, to generate bright pulses and bias the excess noise to arbitrary small values, fully comprising CV-QKD security. These results highlight the feasibility and the impact of the detector blinding attack. We finally discuss how to design countermeasures in order to protect against this attack.

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Gaussian-modulated coherent-state measurement-device-independent quantum key distribution

Cited by 96 publications

References 42 publications

Generating the Local Oscillator “Locally” in Continuous-Variable Quantum Key Distribution Based on Coherent Detection

Generating the Local Oscillator “Locally” in Continuous-Variable Quantum Key Distribution Based on Coherent Detection

Quantum secret sharing using weak coherent states

Homodyne-detector-blinding attack in continuous-variable quantum key distribution

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