"Circular type" quantum key distribution

Nishioka, Takahiro; Ishizuka, Hirotaka; Hasegawa, Tetsuya; Abe, Junichi

doi:10.1109/68.992616

Cited by 46 publications

(23 citation statements)

References 11 publications

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“…There are significant theoretical developments and experimental schemes demonstrated, to name a few of them, see, e.g., [2][3][4][5][6][7][8][9][10] We have complemented and improved performance of QKD network over existing demonstrations in several aspects. This mainly includes all-pass optical switching, novel QKD terminals, 60∼130 km inter-city links, with the help of scalable hybrid network topology.…”

Section: Introductionmentioning

confidence: 99%

Metropolitan all-pass and inter-city quantum communication network

et al. 2010

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Abstract:We have demonstrated a metropolitan all-pass quantum communication network in field fiber for four nodes. Any two nodes of them can be connected in the network to perform quantum key distribution (QKD). An optical switching module is presented that enables arbitrary 2-connectivity among output ports. Integrated QKD terminals are worked out, which can operate either as a transmitter, a receiver, or even both at the same time. Furthermore, an additional link in another city of 60 km fiber (up to 130 km) is seamless integrated into this network based on a trusted relay architecture. On all the links, we have implemented protocol of decoy state scheme. All of necessary electrical hardware, synchronization, feedback control, network software, execution of QKD protocols are made by tailored designing, which allow a completely automatical and stable running. Our system has been put into operation in Hefei in August 2009, and publicly demonstrated during an evaluation conference on quantum network organized by the Chinese Academy of Sciences on August 29, 2009. Real-time voice telephone with one-time pad encoding between any two of the five nodes (four all-pass nodes plus one additional node through relay) is successfully established in the network within 60km. 793-795 (1997). 3. T. Nishioka, H. Ishizuka, T. Hasegawa, and J. Abe, "'Circular type' quantum key distribution," Photon. Technol.Lett., IEEE 14, 576-578 (2002). 4. F. Grosshans, G. V. Assche, J. Wenger, R. Brouri, N. J. Cerf, and P. Grangier, "Quantum key distribution using Gaussian-modulated coherent states," Nature 421, 238-241 (2003). 5. C. Gobby, Z. L. Yuan, and A. J. Shields, "Quantum key distribution over 122 km of standard telecom fiber," Appl. Phys. Lett. 84, 3762-3764 (2004 1155-1163 (1995). 14. P. D. Townsend, "Quantum cryptography on multi-user optical fibre networks," Nature 385, 47-49 (1997).

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Section: Introductionmentioning

confidence: 99%

Metropolitan all-pass and inter-city quantum communication network

et al. 2010

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“…Like the "plug & play" system, the Sagnac loop also offers phase stability and polarization stability, as the two interfering signals travel through the same path, but its structure is in principle much simpler than the "plug & play" scheme [10][11][12][13]. However, all reported Sagnac QKD systems employed polarization-sensitive phase modulators, requiring complicated polarization controls, which makes this scheme unattractive.…”

Section: Introductionmentioning

confidence: 99%

Polarization insensitive phase modulator for quantum cryptosystems

Qi¹,

Huang²,

Lo³

et al. 2006

Opt. Express

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Abstract-We present a design for a quantum key distribution (QKD) system in a Sagnac loop configuration, employing a novel phase modulation scheme based on frequency shift, and demonstrate stable BB84 QKD operation with high interference visibility and low quantum bit error rate (QBER). The phase modulation is achieved by sending two light pulses with a fixed time delay (or a fixed optical path delay) through a frequency shift element and by modulating the amount of frequency shift. The relative phase between two light pulses upon leaving the frequency-shift element is determined by both the time delay (or the optical path delay) and the frequency shift, and can therefore be controlled by varying the amount of frequency shift. To demonstrate its operation, we used an acousto-optic modulator (AOM) as the frequency-shift element, and vary the driving frequency of the AOM to encode phase information. The interference visibility for a 40km and a 10km fiber loop is 96% and 99%, respectively, at single photon level. We ran BB84 protocol in a 40-km Sagnac loop setup continuously for one hour and the measured QBER remained within the 2%∼5% range. A further advantage of our scheme is that both phase and amplitude modulation can be achieved simultaneously by frequency and amplitude modulation of the AOM's driving signal, allowing our QKD system the capability of implementing other protocols, such as the decoy-state QKD and the continuous-variable QKD. We also briefly discuss a new type of Eavesdropping strategy ("phaseremapping" attack) in bidirectional QKD system.

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“…Hong et al proposed an enhanced MQKD using entanglement swapping and a distributor [3]. Nishioka expressed the possibility of constructing multiparty architecture by extending one to many link architecture and looped networks [4]. He demonstrated circular type interferometer system for two parties.…”

Section: Related Workmentioning

confidence: 99%

Simple Post Quantum Scheme for Higher Key Rate Multiparty Quantum Key Distribution

Buhari¹

2012

IJNSA

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We propose a multi-party quantum key distribution protocol which enables all the receivers can convert their respective private shared key into common secret key without use of entanglement. The main component of our protocol is a simple post quantum scheme for achieving the higher secret key rate. Efficiency of the extracted key rate is almost 100%. We assume that sender established the pre-shared private secret keys and a common secret number with the receivers. Our proposed scheme sends n strings of number to n receivers in the public channel to convert their respective shared secret key into common secret key in the presence of Eve. We also analyze the complexity of attack by the adversary to guess the secret key.

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"Circular type" quantum key distribution

Cited by 46 publications

References 11 publications

Metropolitan all-pass and inter-city quantum communication network

Metropolitan all-pass and inter-city quantum communication network

Polarization insensitive phase modulator for quantum cryptosystems

Simple Post Quantum Scheme for Higher Key Rate Multiparty Quantum Key Distribution

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