Long-term field demonstration of WDM quantum key distribution system with stabilization control

Yoshino, K.; Ochi, Takao; Fujiwara, Mikio; Tomita, Akira; Sasaki, Masahide; Tajima, Akio

doi:10.1109/cleopr.2013.6600228

Cited by 2 publications

(3 citation statements)

References 13 publications

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“…Many research groups have been dedicated to make this technique practical [3] and commercialized. Several quantum networks through installed fiber have been reported [4][5][6][7]. Though the technology is demonstrated in university laboratories, maintainability and integration in commercial network still has to be verified.…”

Section: Introductionmentioning

confidence: 99%

TDM-based Interferometric Technique for Maintain-reduced WDM Quantum Key Distribution Network

Zhan

Sun

et al. 2014

Asia Communications and Photonics Conference 2014

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Section: Introductionmentioning

confidence: 99%

TDM-based Interferometric Technique for Maintain-reduced WDM Quantum Key Distribution Network

Zhan

Sun

et al. 2014

Asia Communications and Photonics Conference 2014

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“…Note, however, that this last requirement could be avoided by using either the universal squash idea [30] or the detector-decoy method [31]. That is, by including an additional phase modulator on Bob's side (to perform the Y-basis measurement) one could enhance the performance of several practical systems that generate such four states, e.g., those based on the BB84 protocol [4] or on the coherent-one-way (COW) scheme [32].…”

mentioning

confidence: 99%

“…The field of QKD has progressed very rapidly over the last years, and it now offers practical systems that can operate in realistic environments [3,4].…”

mentioning

confidence: 99%

Loss-tolerant quantum cryptography with imperfect sources

Tamaki

Curty

Kato³

et al. 2014

Phys. Rev. A

189

287

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In principle, quantum key distribution (QKD) offers unconditional security based on the laws of physics. In practice, flaws in the state preparation undermine the security of QKD systems, as standard theoretical approaches to deal with state preparation flaws are not loss-tolerant. An eavesdropper can enhance and exploit such imperfections through quantum channel loss, thus dramatically lowering the key generation rate. Crucially, the security analyses of most existing QKD experiments are rather unrealistic as they typically neglect this effect. Here, we propose a novel and general approach that makes QKD loss-tolerant to state preparation flaws. Importantly, it suggests that the state preparation process in QKD can be significantly less precise than initially thought. Our method can widely apply to other quantum cryptographic protocols.PACS numbers: 03.67.Dd, 03.67.-a Introduction.-Quantum key distribution (QKD) [1] allows two distant parties, Alice and Bob, to distribute a secret key, which is essential to achieve provable secure communications [2]. The field of QKD has progressed very rapidly over the last years, and it now offers practical systems that can operate in realistic environments [3,4].Crucially, QKD provides unconditional security based on the laws of physics, i.e., despite the computational power of the eavesdropper, Eve. Indeed, the security of QKD has been promptly demonstrated for different scenarios [5][6][7][8][9][10][11][12]. Importantly, Gottesman, Lo, Lütkenhaus and Preskill [13] (henceforth referred to as GLLP) proved the security of QKD when Alice's and Bob's devices are flawed, as is the case in practical implementations. Unfortunately, however, GLLP has a severe limitation, namely, it is not loss-tolerant; it assumes the worst case scenario where Eve can enhance flaws in the state preparation by exploiting channel loss. As a result, the key generation rate and achievable distance of QKD are dramatically reduced [14]. Notice that most existing QKD experiments simply ignore state preparation imperfections in their key rate formula, which renders their results unrealistic and not really secure.In this Letter, we show that GLLP's worst case assumption is far too conservative, i.e., in sharp contrast to GLLP, we present a security proof for QKD that is loss-tolerant. Indeed, for the case of modulation errors, an important flaw in real-life QKD systems, we show that Eve cannot exploit channel loss to enhance such imperfections. The intuition here is rather simple: in this type of state preparation flaws the signals sent out by Alice are still qubits, i.e., there is no side-channel for Eve to exploit

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Long-term field demonstration of WDM quantum key distribution system with stabilization control

Cited by 2 publications

References 13 publications

TDM-based Interferometric Technique for Maintain-reduced WDM Quantum Key Distribution Network

TDM-based Interferometric Technique for Maintain-reduced WDM Quantum Key Distribution Network

Loss-tolerant quantum cryptography with imperfect sources

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