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

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

doi:10.1364/oe.4.000383

Cited by 99 publications

(48 citation statements)

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“…The key generation rate as a function of distance Figure 6: Here, we compare various protocols using the parameters in KTH [14], listed in Table 1. …”

Section: Resultsmentioning

confidence: 99%

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Decoy State Quantum Key Distribution

2005

Quantum Information Science

153

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Decoy states have recently been proposed as a useful method for substantially improving the performance of quantum key distribution. Here, we present a general theory of the decoy state protocol based on only two decoy states and one signal state. We perform optimization on the choice of intensities of the two decoy states and the signal state. Our result shows that a decoy state protocol with only two types of decoy states--the vacuum and a weak decoy state-asymptotically approaches the theoretical limit of the most general type of decoy state protocols (with an infinite number of decoy states). Moreover, we provide estimations on the effects of statistical fluctuations and suggest that, even for long distance (larger than 100km) QKD, our two-decoy-state protocol can be implemented with only a few hours of experimental data. In conclusion, decoy state quantum key distribution is highly practical.

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“…The key generation rate as a function of distance Figure 6: Here, we compare various protocols using the parameters in KTH [14], listed in Table 1. …”

Section: Resultsmentioning

confidence: 99%

“…We illustrate this fact in Figure 6 by using the data from the KTH experiment [14]. We find the optimal ν's for each fiber length by numerically solving Eqs.…”

Section: Simulationmentioning

confidence: 99%

Decoy State Quantum Key Distribution

2005

Quantum Information Science

153

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“…The spike-cancellation single-photon detection at the optimized temperature eventually produces a ratio P dark /η ≈ 1.7×10 −6 . By using such high-performance singlephoton detectors, a "plug and play" (P&P) single-photon routing has been realized in 155-km optical fibres with the average photon number 〈n〉 = 0.1 per pulse and a fringe contrast of 87% [41][42][43][44]. Figure 7 is the schematic diagram of short-pulse gated single-photon detectors with balanced outputs by using transformer-based spike cancellation.…”

Section: Efficient Non-linear Control Of Single Photonsmentioning

confidence: 99%

Generation and Detection of Infrared Single Photons and their Applications

Zeng

et al. 2006

Front. Phys. China

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Unbreakable secret communication has been a dream from ancient time. It is quantum physics that gives us hope to turn this wizardly dream into reality. The rapid development of quantum cryptography may put an end to the history of eavesdropping. This will be largely due to the advanced techniques related to single quanta, especially infrared single photons. In this paper, we report on our research works on single-photon control for quantum cryptography, ranging from single-photon generation to single-photon detection and their applications.

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“…In the figure, we put α(α ′ ) = 11(degree) which is almost optimum, and experimental data is taken from KTH [26]. For the secret key gain of BB84 protocol in the figures, we used the formula for the single-photon case in [13],…”

Section: Secret Key Gainmentioning

confidence: 99%

Security of the Bennett 1992 quantum-key distribution protocol against individual attack over a realistic channel

2003

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The security of two-state quantum key distribution against individual attack is estimated when the channel has losses and noises. We assume that Alice and Bob use two nonorthogonal single-photon polarization states. To make our analysis simple, we propose a modified B92 protocol in which Alice and Bob make use of inconclusive results and Bob performs a kind of symmetrization of received states. Using this protocol, Alice and Bob can estimate Eve's information gain as a function of a few parameters which reflect the imperfections of devices or Eve's disturbance. In some parameter regions, Eve's maximum information gain shows counter-intuitive behavior, namely, it decreases as the amount of disturbances increases. For a small noise rate Eve can extract perfect information in the case where the angle between Alice's two states is small or large, while she cannot extract perfect information for intermediate angles. We also estimate the secret key gain which is the net growth of the secret key per one pulse. We show the region where the modified B92 protocol over a realistic channel is secure against individual attack.

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

Abstract: An interferometric quantum cryptographic system at 1550nm wavelength using gated InGaAs Avalanche Photo Diodes as single-photon receivers is demonstrated for a transmission distance up to 40 km.

Cited by 99 publications

References 0 publications

Decoy State Quantum Key Distribution

Decoy State Quantum Key Distribution

Generation and Detection of Infrared Single Photons and their Applications

Security of the Bennett 1992 quantum-key distribution protocol against individual attack over a realistic channel

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