Entanglement of two quantum memories via fibres over dozens of kilometres

Yu, Yong; Ma, Fei; Luo, Xisheng; Jing, Bo; Sun, Peng-Fei; Fang, Ren-Zhou; Yang, Chao-Wei; Liu, Hui; Zheng, Ming-Yang; Xie, Xiaozhu; Zhang, Weijun; You, Lixing; Wang, Zhen; Chen, Teng-Yun; Zhang, Qiang; Bao, Xiao‐Hui; Pan, Jian-Wei

doi:10.1038/s41586-020-1976-7

Cited by 260 publications

(139 citation statements)

References 52 publications

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“…One can then use entanglement swapping (ES) [16] and, possibly, entanglement distillation (ED) to establish high fidelity entanglement over long distances. In early implementations of QRs, it is expected that the initial entanglement distribution [17] over elementary links, as well as ES and ED operations to be probabilistic [18]. This can make the whole system too slow as many steps may need to be repeated upon a failure [19].…”

Section: Introductionmentioning

confidence: 99%

Quantum Key Distribution Over Quantum Repeaters with Encoding: Using Error Detection as an Effective Postselection Tool

2020

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Section: Introductionmentioning

confidence: 99%

Quantum Key Distribution Over Quantum Repeaters with Encoding: Using Error Detection as an Effective Postselection Tool

2020

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“…The decoherence of the stationary qubit changes a pure state into a mixed one, and it introduces an additional bit-error rate with the lower bound of p e = [1 − exp(−2L/cT 2 )]/2 ∼ L/cT 2 1, which constraints the communicating distance L for a given T 2 and the light speed c. The two-step QSDC with quantum memory was demonstrated with a fidelity of 0.9 [55]. Very recently, the entanglement between two quantum memories over dozens of kilometres was realized [81]. Their quantum memory setup can be modified to implement our protocol directly.…”

Section: Discussionmentioning

confidence: 99%

Quantum secure direct communication based on single-photon Bell-state measurement

Long

2020

New J. Phys.

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Security loopholes exploiting the flaws of practical apparatus, especially non-ideal photon detectors, are pressing issues in practical quantum communication. We propose a simple quantum secure direct communication protocol based on single-photon Bell-state measurement and remove side-channel attacks on photon detectors. This quantum communication protocol in principle works in a deterministic way, and it does not require the two-photon interference of photons from independent sources. The single-photon Bell-state measurement with a unity efficiency can be constructed with only linear optics, which significantly simplifies its experimental implementation. Furthermore, we prove that our quantum secure direct communication protocol is immune to general detector-side-channel attacks.

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“…Such a quantum memory could be used for the distribution of quantum information over large distances, which represents a great challenge due to photon loss. Several socalled quantum repeater protocols [85,86] based on atomic ensemble memories have been proposed to overcome this challenge, and experiments are progressing rapidly [87,88]. In addition, light-matter interfaces could be harnessed to engineer non-linearities between single photons at the single-particle level.…”

Section: Perspectivesmentioning

confidence: 99%

Quantum computing with neutral atoms

Henriet¹,

Béguin²,

Signoles³

et al. 2020

Quantum

280

167

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The manipulation of neutral atoms by light is at the heart of countless scientific discoveries in the field of quantum physics in the last three decades. The level of control that has been achieved at the single particle level within arrays of optical traps, while preserving the fundamental properties of quantum matter (coherence, entanglement, superposition), makes these technologies prime candidates to implement disruptive computation paradigms. In this paper, we review the main characteristics of these devices from atoms / qubits to application interfaces, and propose a classification of a wide variety of tasks that can already be addressed in a computationally efficient manner in the Noisy Intermediate Scale Quantum\cite{Preskill_NISQ} era we are in. We illustrate how applications ranging from optimization challenges to simulation of quantum systems can be explored either at the digital level (programming gate-based circuits) or at the analog level (programming Hamiltonian sequences). We give evidence of the intrinsic scalability of neutral atom quantum processors in the 100-1,000 qubits range and introduce prospects for universal fault tolerant quantum computing and applications beyond quantum computing.

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Entanglement of two quantum memories via fibres over dozens of kilometres

Cited by 260 publications

References 52 publications

Quantum Key Distribution Over Quantum Repeaters with Encoding: Using Error Detection as an Effective Postselection Tool

Quantum Key Distribution Over Quantum Repeaters with Encoding: Using Error Detection as an Effective Postselection Tool

Quantum secure direct communication based on single-photon Bell-state measurement

Quantum computing with neutral atoms

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