Faraday–Michelson system for quantum cryptography

Mo, Xinxin; Zhu, Bing; Han, Zheng‐Fu; Gui, Youzhen; Guo, Guang‐Can

doi:10.1364/ol.30.002632

Cited by 189 publications

(115 citation statements)

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“…Throughout this paper, we call this implementation as coherent state QKD. Many coherent state QKD experiments have been performed since the first QKD experiment [14], see for example [15,16,17,18,19,20].…”

Section: Introductionmentioning

confidence: 99%

Quantum key distribution with entangled photon sources

2007

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A parametric down-conversion (PDC) source can be used as either a triggered single photon source or an entangled photon source in quantum key distribution (QKD). The triggering PDC QKD has already been studied in the literature. On the other hand, a model and a post-processing protocol for the entanglement PDC QKD are still missing. In this paper, we fill in this important gap by proposing such a model and a post-processing protocol for the entanglement PDC QKD.Although the PDC model is proposed to study the entanglement-based QKD, we emphasize that our generic model may also be useful for other non-QKD experiments involving a PDC source.Since an entangled PDC source is a basis independent source, we apply Koashi-Preskill's security analysis to the entanglement PDC QKD. We also investigate the entanglement PDC QKD with two-way classical communications. We find that the recurrence scheme increases the key rate and Gottesman-Lo protocol helps tolerate higher channel losses. By simulating a recent 144km open-air PDC experiment, we compare three implementations -entanglement PDC QKD, triggering PDC QKD and coherent state QKD. The simulation result suggests that the entanglement PDC QKD can tolerate higher channel losses than the coherent state QKD. The coherent state QKD with decoy states is able to achieve highest key rate in the low and medium-loss regions. By applying Gottesman-Lo two-way post-processing protocol, the entanglement PDC QKD can tolerate up to 70dB combined channel losses (35dB for each channel) provided that the PDC source is placed in between Alice and Bob. After considering statistical fluctuations, the PDC setup can tolerate up to 53dB channel losses.

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Section: Introductionmentioning

confidence: 99%

Quantum key distribution with entangled photon sources

2007

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“…Therefore, standardized design of QKD devices was tried before deployment of the wide area QKD network, especially for the symmetry among QKD devices which will be discussed later. All P2P QKD devices adopted the Faraday-Michelson interferometer (FMI) system [11] to implement phase coding BB84 protocol [54] with the decoy state method [55][56][57]. And, all parts of each QKD devices were housed in a standardized 3.5U rack mount case (15.6×44×40, H×W×D, cm), in which the optics, associated electronics, the single photon detector, and one computer with a displayer and a keyboard were all included.…”

Section: P2p Qkd Devices In the Wide Area Qkd Networkmentioning

confidence: 99%

“…Instead of adding stabilization mechanism, we adopted two measures to automatically compensate these two types of variations of channels respectively. By using phase coding system based on FMI, QKD devices were insensitive to the polarization disturbance of channels [11]. The other measure was multiplexing quantum and sync signals in the same fiber with only 1.6 nm wavelength interval to compensate changes in optical path length, which led to drift of synchronization between the QKD-Transmitter and QKD-Receiver.…”

Section: The Influence From Weather and Measures For Qkdmentioning

confidence: 99%

“…Different from the ways employing mathematical techniques to avoid eavesdroppers, the unconditional security of QKD originates from quantum physics, and has been theoretically proved [1,2]. Since Muller et al successfully implemented the first QKD experiment over 23 km installed optical fiber under Lake Geneva [3], several groups have demonstrated their QKD experiments in field environments [4][5][6][7][8][9][10][11][12][13]. QKD has moved far beyond laboratory experiments.…”

Section: Introductionmentioning

confidence: 99%

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Field and long-term demonstration of a wide area quantum key distribution network

Wang¹,

Chen²,

Yin³

et al. 2014

Opt. Express

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260

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Abstract:A wide area quantum key distribution (QKD) network deployed on communication infrastructures provided by China Mobile Ltd. is demonstrated. Three cities and two metropolitan area QKD networks were linked up to form the Hefei-Chaohu-Wuhu wide area QKD network with over 150 kilometers coverage area, in which Hefei metropolitan area QKD network was a typical full-mesh core network to offer all-to-all interconnections, and Wuhu metropolitan area QKD network was a representative quantum access network with point-to-multipoint configuration. The whole wide area QKD network ran for more than 5000 hours, from 21 December 2011 to 19 July 2012, and part of the network stopped until last December. To adapt to the complex and volatile field environment, the Faraday-Michelson QKD system with several stability measures was adopted when we designed QKD devices. Through standardized design of QKD devices, resolution of symmetry problem of QKD devices, and seamless switching in dynamic QKD network, we realized the effective integration between point-to-point QKD techniques and networking schemes. 449-449 (1995). 4. R. J. Hughes, G. G. Luther, G. L. Morgan, C. G. Peterson, and C. Simmons, "Quantum cryptography over underground optical fibers," Lecture Notes in Computer Science, 1109, 329-342 (1996).5. P. D. Townsend, "Simultaneous quantum cryptographic key distribution and conventional data transmission over installed fibre using wavelength-division multiplexing," Electron. Lett. 33, 188-190 (1997

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“…Interferometers have been investigated in relation to their applications in fields such as metrology [1] , optical sensing [2] , optical communication [3,4] , quantum information processing [5] , and biomedical engineering [6] . A number of schemes have been proposed to improve the performance of interferometers [7] , such as using photonic crystal structures to minimize the size of on-chip devices [8] , utilizing the dispersive property of semiconductor to enhance the spectral sensitivity of interferometers [9,10] , utilizing slow light medium to enhance the resolution of Fourier transform interferometer [11] , exploiting fast light medium or slow light structure to increase the rotation sensitivity of a Sagnac interferometer [12,13] , enhancing the transmittance of the Mach-Zehnder interferometer (MZI) in the slow light region by gratings [14] , and using liquid crystal light valve to derive high sensitivity interferometers [15] .…”

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confidence: 99%