Experimental demonstration of the DPTS QKD protocol over a 170 km fiber link

Lio, Beatrice Da; Bacco, Davide; Cozzolino, Daniele; Ding, Yunhong; Dalgaard, Kjeld; Rottwitt, Karsten; Oxenløwe, Leif Katsuo

doi:10.1063/1.5049659

Cited by 18 publications

(7 citation statements)

References 25 publications

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“…Time-bin encoding of weak coherent laser pulses is the most popular technique for implementing QKD over single-mode fibers [9,10,11]. Recent demonstrations of high-dimensional temporal encoding showed a significant key rate improvement [12,13,14].…”

Section: Introductionmentioning

confidence: 99%

Fast and Simple One-Way High-Dimensional Quantum Key Distribution

Sulimany¹,

Dudkiewicz²,

Korenblit³

et al. 2021

Preprint

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High-dimensional quantum key distribution (QKD) provides ultimate secure communication with secure key rates that cannot be obtained by QKD protocols with binary encoding. However, so far the proposed protocols required additional experimental resources, thus raising the cost of practical high-dimensional systems and limiting their use. Here, we analyze and demonstrate a novel scheme for fiber-based arbitrary-dimensional QKD, based on the most popular commercial hardware for binary time bins encoding. Quantum state transmission is tested over 40 km channel length of standard single-mode fiber, exhibiting a two-fold enhancement of the secret key rate in comparison to the binary Coherent One Way (COW) protocol, without introducing any hardware modifications. This work holds a great potential to enhance the performance of already installed QKD systems by software update alone.

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Section: Introductionmentioning

confidence: 99%

Fast and Simple One-Way High-Dimensional Quantum Key Distribution

Sulimany¹,

Dudkiewicz²,

Korenblit³

et al. 2021

Preprint

View full text Add to dashboard Cite

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“…Therefore, in order to improve the secret key rate of RRDPS protocol, by enhancing its tolerance with respect to the instability of the apparatus, we propose a round-robin differential phase-time-shifting (RRDPTS) protocol, in which the time of arrival and the relative phase of light pulses are used to encode two secret key bits in each L-pulse signal. This protocol is an extension of the DPTS protocol introduced by Bacco et al in [13,14], belonging to the DPR family. The security analysis of the RRDPTS protocol under collective attacks is derived for different photon number statistics.…”

Section: Introductionmentioning

confidence: 99%

Round-robin differential phase-time-shifting protocol for quantum key distribution: theory and experiment

Wang,

Vagniluca,

Zhang

et al. 2021

Preprint

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Quantum key distribution (QKD) allows the establishment of common cryptographic keys among distant parties. Many of the QKD protocols that were introduced in the past, involve the challenge of monitoring the signal disturbance over the communication line, in order to evaluate the information leakage to a potential eavesdropper. Recently, a QKD protocol that circumvents the need for monitoring signal disturbance, has been proposed and demonstrated in initial experiments. Here, we propose a new version of this so-called round-robin differential phase-shifting (RRDPS) protocol, in which both time and phase degrees-of-freedom are utilized to enlarge the Hilbert space dimensionality, without increasing experimental complexity or relaxing security assumptions. We derive the security proofs of the round-robin differential phase-time-shifting (RRDPTS) protocol in the collective attack scenario, and benchmark the new protocol against RRDPS for different experimental parameters. Furthermore, a proof-of-concept experiment of the RRDPTS protocol, using weak coherent pulses and decoy state method, is demonstrated over 80 km of fiber link. Our results show that the RRDPTS protocol can achieve higher secret key rate in comparison with the RRDPS, in the condition of high quantum bit error rate.

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“…The result is an increase in the secret key rate achievable by high-dimensional QKD, as compared with standard QKD protocols with binary encoding (d = 2), at least until the overall losses are low enough to keep negligible the random dark counts at the receiver [8][9][10]. Although there are many degrees of freedom to be exploited to send more than one bit per photon [11][12][13][14][15], time-bin and time-energy encoding are the ones more suitable for single-mode fiber propagation, and thus more compatible with the already existing and widespread fiber networks [16][17][18][19][20][21][22][23]. Recent demonstrations of one-way fiber-based QKD include the record-breaking key rate of 26.2 Mbit/s at 4 dB channel loss [19], achieved with a 4-dimensional time-bin protocol with two decoy states, which is proven to be robust against the most general (or coherent) attacks as well as finite-size effects.…”

Section: Introductionmentioning

confidence: 99%

Efficient time-bin encoding for practical high-dimensional quantum key distribution

Vagniluca,

Da Lio,

Rusca

et al. 2020

Preprint

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High-dimensional quantum key distribution (QKD) allows to achieve information-theoretic secure communications, providing high key generation rates which cannot in principle be obtained by QKD protocols with binary encoding. Nonetheless, the amount of experimental resources needed increases as the quantum states to be detected belong to a larger Hilbert space, thus raising the costs of practical high-dimensional systems. Here, we present a novel scheme for fiber-based 4-dimensional QKD, with time and phase encoding and one-decoy state technique. Quantum states transmission is tested over different channel lengths up to 145 km of standard single-mode fiber, evaluating the enhancement of the secret key rate in comparison to the three-state 2-dimensional BB84 protocol, which is tested with the same experimental setup. Our scheme allows to measure the 4-dimensional states with a simplified and compact receiver, where only two single-photon detectors are necessary, thus making it a cost-effective solution for practical and fiber-based QKD.

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Experimental demonstration of the DPTS QKD protocol over a 170 km fiber link

Cited by 18 publications

References 25 publications

Fast and Simple One-Way High-Dimensional Quantum Key Distribution

Fast and Simple One-Way High-Dimensional Quantum Key Distribution

Round-robin differential phase-time-shifting protocol for quantum key distribution: theory and experiment

Efficient time-bin encoding for practical high-dimensional quantum key distribution

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