Experiments on long wavelength (1550 nm) "plug and play" quantum cryptography systems

Bourennane, Mohamed; Gibson, Frank W.; Hening, Alexandru; Jönsson, Per; Tsegaye, T.; Ljunggren, Daniel; Sundberg, E.

doi:10.1109/qels.1999.807380

Cited by 19 publications

(29 citation statements)

References 3 publications

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“…2), those that are shown to be insecure [5,6] (the area outside of the two bound curves). Note that the area between the 'coherent' line and the two bounds is the area We use the parameters of Bourennane et al [20] for 1.5µm to show the secure gain rate per time slot using our results ('coherent'). For comparison, the corresponding results for security against individual attack [6] are given.…”

Section: Theoremmentioning

confidence: 99%

Unconditional security of practical quantum key distribution

Inamori¹,

2007

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Section: Theoremmentioning

confidence: 99%

Unconditional security of practical quantum key distribution

Inamori¹,

2007

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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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“…1 Ekert then presented the E91 protocol, 2 which was simplified by Bennett, Brassad, and Mermin in 1992, and has become known as the BB92 protocol. 3 Current QKD systems are implemented using weak coherent sources [4][5][6] and entangled photon sources.…”

Section: Introductionmentioning

confidence: 99%

PPLN-waveguide-based polarization entangled QKD simulator

Gariano

Djordjević

2017

Quantum Communications and Quantum Imaging XV

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We have developed a comprehensive simulator to study the polarization entangled quantum key distribution (QKD) system, which takes various imperfections into account. We assume that a type-II SPDC source using a PPLN-based nonlinear optical waveguide is used to generate entangled photon pairs and implements the BB84 protocol, using two mutually unbiased basis with two orthogonal polarizations in each basis. The entangled photon pairs are then simulated to be transmitted to both parties; Alice and Bob, through the optical channel, imperfect optical elements and onto the imperfect detector. It is assumed that Eve has no control over the detectors, and can only gain information from the public channel and the intercept resend attack. The secure key rate (SKR) is calculated using an upper bound and by using actual code rates of LDPC codes implementable in FPGA hardware. After the verification of the simulation results, such as the pair generation rate and the number of error due to multiple pairs, for the ideal scenario, available in the literature, we then introduce various imperfections. Then, the results are compared to previously reported experimental results where a BBO nonlinear crystal is used, and the improvements in SKRs are determined for when a PPLN-waveguide is used instead.

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Experiments on long wavelength (1550 nm) "plug and play" quantum cryptography systems

Cited by 19 publications

References 3 publications

Unconditional security of practical quantum key distribution

Unconditional security of practical quantum key distribution

Quantum key distribution with entangled photon sources

PPLN-waveguide-based polarization entangled QKD simulator

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