Efficient Time-Bin Encoding for Practical High-Dimensional Quantum Key Distribution

Vagniluca, Ilaria; Lio, Beatrice Da; Rusca, Davide; Cozzolino, Daniele; Ding, Yunhong; Zbinden, Hugo; Zavatta, Alessandro; Oxenløwe, Leif Katsuo; Bacco, Davide

doi:10.1103/physrevapplied.14.014051

Cited by 67 publications

(42 citation statements)

References 27 publications

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“…Besides potential increases in noise tolerance, highdimensional systems afford other advantages, namely that greater communication efficiency is possible per signal (meaning potentially more bits may be sent per signal due to the increased dimension). Such systems are experimentally feasible also through, for example, time-bin encoding [42], [43], or space division multiplexing [44] just to list some examples. Finally, some protocols, such as the so-called "round-robin" protocol [38] actually allow users to bound Eve's information based only on the dimension instead of the observed noise.…”

Section: Transactions On Ieeementioning

confidence: 99%

High-Dimensional Semiquantum Cryptography

Iqbal

Krawec

2020

IEEE Trans. Quantum Eng.

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A semiquantum key distribution (SQKD) protocol allows two users, one of whom is restricted in their quantum capabilities to being nearly classical, to establish a shared secret key, secure against an all-powerful adversary. The study of such protocols helps to answer the fundamental question of "how quantum" must a protocol be to gain an advantage over classical communication. In this article, we design a new SQKD protocol using high-dimensional quantum states and conduct an information theoretic security analysis. We show that, similar to the fully quantum key distribution case, high-dimensional systems can increase the noise tolerance in the semiquantum case. Furthermore, we prove several general security results which are applicable to other (S)QKD protocols (both high-dimensional ones and standard qubit-based protocols) utilizing a two-way quantum channel.

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Section: Transactions On Ieeementioning

confidence: 99%

High-Dimensional Semiquantum Cryptography

Iqbal

Krawec

2020

IEEE Trans. Quantum Eng.

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“…In order to increase the signal to noise ratio, that is, the contrast with respect to the background of the photons emitted in CW, it is often necessary to set up a cascade of two intensity modulators, with a consequent doubling of the carving signals, which need to be perfectly synchronized to enable their tandem operation. [82,83] The use of mode-locked lasers would therefore simplify the source [84,85] but still this implementation would suffer of the second drawback, that is, the phase coherence between the train of pulses. As explained in Section 1, phase randomization is central for the secure implementation of the WCP BB84 protocol.…”

Section: Phase Randomized Pulse Sources For Qrngs and Qkdmentioning

confidence: 99%

Advanced Laser Technology for Quantum Communications (Tutorial Review)

et al. 2021

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Quantum communications is the art of exchanging and manipulating information beyond the capabilities of our conventional technologies using the laws of quantum mechanics. With applications ranging from quantum computing to cryptographic systems with information-theoretic security, there is strong incentive to introduce quantum communications into many areas of our society. However, an important challenge is to develop viable technologies meeting the stringent requirements of low noise and high coherence for quantum state encoding, of high bit rate and low power for the integration with classical communication networks and of scalable and low-cost production for a practical wide-deployment. This tutorial presents recent advances in laser modulation technologies that have enabled the development of efficient and versatile light sources for quantum communications, with a particular focus on quantum key distribution (QKD). Such approaches have been successfully used to demonstrate several QKD protocols with state-of-the-art performance. The applications and experimental results are reviewed and interpreted in the light of a complete theoretical background, allowing the reader to model and simulate such sources.

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“…The equation for the secret key length is [34]: The secret key length is defined as the number of secret key bits that are created in a privacy amplification block of length n Z . The terms D Z 0 and D Z 1 are the lower bounds for the vacuum and single-photons events in the Z basis, respectively; the function H(•) is the high dimensional entropy; the term φ Z represents the upper bound on the phase error in the Z basis; λ EC is the number of discarded bits during the error correction procedure, and the terms sec and cor are the secrecy and correctness parameters.…”

Section: Quantum Protocolmentioning

confidence: 99%

Stable Transmission of High-Dimensional Quantum States Over a 2-km Multicore Fiber

Lio

Oxenløwe

Bacco

et al. 2020

IEEE J. Select. Topics Quantum Electron.

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High-dimensional quantum states have already settled their advantages in different quantum technology applications. However, their reliable transmission in fiber links remains an open challenge that must be addressed to boost their application, e.g. in the future quantum internet. Here, we prove how path encoded high-dimensional quantum states can be reliably transmitted over a 2 km long multicore fiber, taking advantage of a phase-locked loop system guaranteeing a stable interferometric detection.Index Terms-Quantum communication, quantum key distribution, high-dimensional path encoding, multicore fiber

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Efficient Time-Bin Encoding for Practical High-Dimensional Quantum Key Distribution

Cited by 67 publications

References 27 publications

High-Dimensional Semiquantum Cryptography

High-Dimensional Semiquantum Cryptography

Advanced Laser Technology for Quantum Communications (Tutorial Review)

Stable Transmission of High-Dimensional Quantum States Over a 2-km Multicore Fiber

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