Quantum Photonic Network: Concept, Basic Tools, and Future Issues

Sasaki, Masahide; Fujiwara, Mikio; Jin, Rui-Bo; Takeoka, Masahiro; Han, Te Sun; Endo, Hisao; Yoshino, K.; Ochi, Takao; Asami, Shione; Tajima, Akio

doi:10.1109/jstqe.2014.2369507

Cited by 40 publications

(24 citation statements)

References 56 publications

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“…Fortunately, quantum key distribution (QKD) provides a highly secure approach to sharing random encryption keys by transmitting single photons [2]. Although QKD has advanced from simple proof-of-principle experiments towards robust long-term demonstrations [3][4][5][6], it has still not obtained wide-scale adoption.…”

mentioning

confidence: 99%

Integrated silicon photonics for high-speed quantum key distribution

Sibson¹,

Kennard²,

Stanisic³

et al. 2017

Optica

230

170

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Integrated photonics offers great potential for quantum communication devices in terms of complexity, robustness and scalability. Silicon photonics in particular is a leading platform for quantum photonic technologies, with further benefits of miniaturisation, cost-effective device manufacture and compatibility with CMOS microelectronics. However, effective techniques for high-speed modulation of quantum states in standard silicon photonic platforms have been limited. Here we overcome this limitation and demonstrate high-speed low-error quantum key distribution modulation with silicon photonic devices combining slow thermo-optic DC biases and fast (10 GHz bandwidth) carrier-depletion modulation. The ability to scale up these integrated circuits and incorporate microelectronics opens the way to new and advanced integrated quantum communication technologies and larger adoption of quantum-secured communications.

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mentioning

confidence: 99%

Integrated silicon photonics for high-speed quantum key distribution

Sibson¹,

Kennard²,

Stanisic³

et al. 2017

Optica

230

170

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“…Here, φ(ρ|W B , q, r) in (24) and φ(−ρ|W E , q, r) in (25) are functions of the given channels W B , W E and the input probability q. For the wiretap channel based on the OOK considered in this paper, these functions are given as in (26) and (27) at the top of the next page. The arbitrary constant r ≥ 0 is optimized so that each exponent be maximized.…”

Section: A Formulationmentioning

confidence: 99%

Numerical Study on Secrecy Capacity and Code Length Dependence of the Performances in Optical Wiretap Channels

et al. 2015

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Secrecy issues of free-space optical links realizing information theoretically secure communications as well as high transmission rates are discussed. We numerically study secrecy communication rates of optical wiretap channel based on onoff keying modulation under typical conditions met in satelliteground links. It is shown that under reasonable degraded conditions on a wiretapper, information theoretically secure communications should be possible in a much wider distance range than a range limit of quantum key distribution, enabling secure optical links between geostationary earth orbit satellites and ground stations with currently available technologies. We also provide the upper bounds on the decoding error probability and the leaked information to estimate a necessary code length for given required levels of performances. This result ensures that a reasonable length wiretap channel code for our proposed scheme must exist.Index Terms-Physical layer security, free space optical communication, secrecy capacity, finite-length analysis.

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“…Against such a serious loophole, we develop its countermeasure which does not require new hardware. Although there are previous works [27][28][29] extending the coverage of the security proofs to accommodate the non-IID cases, a better performance of the QKD system will be achieved by developing more preemptive methods to circumvent correlations and fluctuations, based on the understanding on the real GHz-clocked QKD system [12] characteristics. We experimentally observe this modulation-pattern dependent intensity deviation and provide an efficient countermeasure.…”

Section: Introductionmentioning

confidence: 99%

Quantum key distribution with an efficient countermeasure against correlated intensity fluctuations in optical pulses

Yoshino¹,

Fujiwara²,

Nakata³

et al. 2018

npj Quantum Inf

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Quantum key distribution (QKD) allows two distant parties to share secret keys with the proven security even in the presence of an eavesdropper with unbounded computational power. Recently, GHz-clock decoy QKD systems have been realized by employing ultrafast optical communication devices. However, security loopholes of high-speed systems have not been fully explored yet. Here we point out a security loophole at the transmitter of the GHz-clock QKD, which is a common problem in high-speed QKD systems using practical band-width limited devices. We experimentally observe the inter-pulse intensity correlation and modulation patterndependent intensity deviation in a practical high-speed QKD system. Such correlation violates the assumption of most security theories. We also provide its countermeasure which does not require significant changes of hardware and can generate keys secure over 100 km fiber transmission. Our countermeasure is simple, effective and applicable to wide range of high-speed QKD systems, and thus paves the way to realize ultrafast and security-certified commercial QKD systems.npj Quantum Information (2018) 4:8 ; doi:10.1038/s41534-017-0057-8 INTRODUCTION Quantum key distribution (QKD) 1-3 allows two legitimate parties, Alice and Bob, to establish symmetric keys with the proven security even in the presence of an eavesdropper, Eve, who has unbounded computational power. Thanks to this unique feature, referred to as "information theoretic security", QKD, combined with Vernam's one-time pad cipher, enables the everlasting protection of confidentiality of data transmission, and hence must be an essential element to construct a long-term security system which cannot be realized only by cryptographic schemes based on computational security. Such a system has been exemplified in the literatures 4,5 as a long-term secure storage network consisting of secret sharing, QKD and authentication schemes to deal with highly confidential data such as personal biomedical data, pharmaceutical, and genetic information. Because of growing interest in the confidentiality of those data, this storage network could be one of the killer applications of QKD.Toward its practical realization, tremendous progress has been made during the past decades. Metropolitan QKD networks have been successfully deployed 6-10 and is going to be a continental scale. 11 To provide information theoretically secure keys to real applications securely and seamlessly, an efficient key management system and application program interfaces have been developed. 12 For the QKD device itself, high-speed and stable operation is critical. By employing the ultrafast optical communication devices, high-speed QKD systems stably operated at GHzclock frequency is realized in the installed fiber networks. [13][14][15] Nevertheless, there remains an obstacle that makes the potential users hesitate to adopt this emerging technology; they would not innovate their existing secure communication systems unless convinced that a QKD system at hand is really secure. I...

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Quantum Photonic Network: Concept, Basic Tools, and Future Issues

Cited by 40 publications

References 56 publications

Integrated silicon photonics for high-speed quantum key distribution

Integrated silicon photonics for high-speed quantum key distribution

Numerical Study on Secrecy Capacity and Code Length Dependence of the Performances in Optical Wiretap Channels

Quantum key distribution with an efficient countermeasure against correlated intensity fluctuations in optical pulses

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