Asymptotically Optimal Prepare-Measure Quantum Key Distribution Protocol

Shu, Hao

doi:10.1007/s10773-023-05447-0

Cited by 3 publications

(1 citation statement)

References 38 publications

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“…It is worth noting how, in the case of 10 Hz of DCR with an efficiency of 0.9, we can extract a key over 250 km of distance, the QBER will be much higher than 11%, that is the security threshold the BB84 protocol [24], hence, we must discard the key. Finally, we can also estimate, the communication performance over a metropolitan area, taking, as reference distance 50 km, using efficiency and dark counts shown in the device characterization section, adding, for example, a DCR of 10 Hz to simulate a noisy system.…”

Section: Simulationmentioning

confidence: 99%

High Performance Superconducting Nanowire Single Photon Detectors for QKD Applications

Bruscino,

Ercolano,

Salvoni

et al. 2024

IEEE Trans. Appl. Supercond.

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The forthcoming era of quantum computers can be a threat to the conventional cryptography and data security. Quantum Key Distribution (QKD) provides unconditional security under real-life conditions with several protocols over long distances in fibre and free space communication. Superconducting Nanowire Single Photon Detectors (SNSPDs) are becoming a dominant technology for QKD thanks to their unique characteristics, such as a near-unity efficiency in the infrared, low dark counts and picoseconds time resolution. Where the detector is typically a weakness of QKD, these SNSPDs characteristics make exploitation difficult. In this work, we characterized NbN SNSPDs at 2.2 K, using a CW laser source at 1550 nm, varying both bias currents and input photon rates to prove their high efficiency at low dark counts with a high counting rate, consistent with the requirements for QKD over long distances or with a high secure key rate.

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Section: Simulationmentioning

confidence: 99%

High Performance Superconducting Nanowire Single Photon Detectors for QKD Applications

Bruscino,

Ercolano,

Salvoni

et al. 2024

IEEE Trans. Appl. Supercond.

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Enhancing Quantum Key Distribution Performance in the Presence of Noise

Harraz,

Wang,

Cong

2024

Int J Theor Phys

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Solve single photon detector problems

Shu

2023

Quantum

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Single photon detector(SPD) problems arise in most quantum tasks, especially for measuring states going through high-lost channels. They are particularly prominent in quantum key distribution(QKD), which could be the most significant application in quantum information theory. In recent years, QKD distance has been improved dramatically but is still restricted because the bit error rate(QBER) caused by SPD dark counts will be out of control as the distance increases. If this problem can be solved, QKD can be implemented over arbitrarily long distances. However, previous solutions often result in impractical requirements such as superconductors while they can only reduce the dark count rate to finite low levels. In this paper, we solve SPD problems with today's technologies only. Although it is the no-cloning theorem that prevents a state from being measured multiple times to obtain a more reliable result, we propose a scheme circumventing the no-cloning theorem in certain tasks to allow a single state to be employed several times. The scheme demonstrates that imperfect detectors can provide nearly perfect results, namely, the QBER caused by dark counts can be reduced to arbitrarily low while in the meantime, detective efficiency can be improved to arbitrarily high. Consequently, QKD distance is not limited by the imperfect SPD anymore and can be improved from hundreds of kilometers to thousands without high-technology detectors. Furthermore, similar schemes can be applied for reducing measurement errors or improving the performance of sources. Finally, it is worth noting that although the paper is mainly discussed in the context of QKD, our scheme is an independent scheme that could be employed in other protocols wherever SPD are employed.

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Asymptotically Optimal Prepare-Measure Quantum Key Distribution Protocol

Cited by 3 publications

References 38 publications

High Performance Superconducting Nanowire Single Photon Detectors for QKD Applications

High Performance Superconducting Nanowire Single Photon Detectors for QKD Applications

Enhancing Quantum Key Distribution Performance in the Presence of Noise

Solve single photon detector problems

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