Error-detected three-photon hyperparallel Toffoli gate with state-selective reflection

Wu, Yiming; Fan, Gang; Du, Fangfang

doi:10.1007/s11467-022-1172-3

Cited by 25 publications

(8 citation statements)

References 68 publications

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“…This is the reason why, even today, the intrinsic springs of what, without a doubt, constitutes the most interesting and useful phenomenon in physics, i.e., entanglement, are unknown in all its magnitude. However, even with incomplete knowledge of it, the twenty-first century has become the moment of the birth of the so-called quantum information science 6 , of which quantum computation [7][8][9][10][11] , and quantum communications [12][13][14][15] represent the most promising verticals, both having entanglement as an essential tool for their development. The advances produced in this area intrinsically imply small and important steps, due to the need to avoid a certain number of obstacles grouped in a family of no-go theorems 6 , of which the most conspicuous is without a doubt the no-cloning theorem 16 .…”

Section: Mario Mastrianimentioning

confidence: 99%

Simplified entanglement swapping protocol for the quantum Internet

Mastriani

2023

Sci Rep

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In this study, a simplified version of the entanglement-swapping protocol, commonly used in the deployment of quantum networks, is presented. Quantum repeaters are essential in extending the range of quantum networks, especially when they are implemented through the laying of optical fiber. The simplified version of the entanglement-swapping protocol does not require the use of unitary transforms to finish characterizing the shared Bell state at both ends to be connected, as happens in the traditional version of the protocol, facilitating and reducing costs in quantum repeater implementations. Both a theoretical demonstration and an experimental one on an optical table, based on two revealing experiments, show the excellent performance of the presented protocol.

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Section: Mario Mastrianimentioning

confidence: 99%

Simplified entanglement swapping protocol for the quantum Internet

Mastriani

2023

Sci Rep

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“…[22] So far, hyperentanglement presents lots of unique opportunities for new kinds of QIP. For instance, it can be used to greatly improve the channel capacity and the security of quantum communication in linear photonic superdense coding, [26] entanglement witness, [27] quantum key distribution, [28] one-way quantum computing, [29] complete and deterministic Bell-state analysis, [30,31] teleportation-based quantum networking, [32] linear-optics heralded amplification, [33] hyperparallel quantum gates, [34][35][36][37][38][39] etc.…”

Section: Introductionmentioning

confidence: 99%

Faithful and efficient hyperentanglement purification for spatial-polarization-time-bin photon system

Du¹,

Fan²,

Wu³

et al. 2023

Chinese Phys. B

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We present a faithful and efficient hyperentanglement purification protocol (hyper-EPP) for nonlocal two-photon systems in spatial-polarization-time-bin hyperentangled Bell states. As the single-photon detectors can detect and herald the undesirable properties caused by the side leakage and the finite coupling strength, the parity-check gates and SWAP gates of our hyper-EPP in the spatial, the polarization, and the time-bin modes degrees of freedom (DoFs) work faithfully. The qubit-flip errors on photon systems in three DoFs can be corrected effectively with the faithful parity-check gates and the photon pairs can reuse to distill high-fidelity ones by introducing the faithful SWAP gates, which greatly increases the efficiency of our hyper-EPP. Further, the maximal hyperentanglement can be obtained in principle by operating the hyper-EPP multiple rounds.

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“…Quantum entanglement is an extremely characteristic phenomenon in quantum information processing (QIP) and constitutes a fascinating resource in very remote quantum communication networks based on different functionalities, especially quantum teleportation [1], quantum gates [2][3][4][5][6][7][8], quantum dense coding [9,10], quantum key distribution [11][12][13], quantum secret sharing [14], and quantum secure direct communication [15][16][17][18][19][20][21]. Unfortunately, the quality of nonlocal entangled quantum systems may be diminished by the * Author to whom any correspondence should be addressed.…”

Section: Introductionmentioning

confidence: 99%

Compact entanglement concentration for three-electron-spin W states with error-detected parity-check gates

Fan¹,

Ren²,

Du³

2023

Laser Phys.

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We present a compact entanglement concentration protocol (ECP) for unknown less-entangled three-electron-spin W states, resorting to the interaction rules between the circularly polarized photon and cavity-quantum-dot (QD) system. In the first step of our ECP, the parties utilize two less-entangled three-electron-spin systems not only to obtain one partially entangled three-electron-spin system with two unknown parameters if the odd-parity occurs with the parity-check gate (PCG) but also to get one entangled two-electron-spin system if the even-parity occurs. By exploiting the above three-electron-spin and two-electron-spin systems as the resource for the second step of our ECP, the parties can obtain a standard three-electron-spin W state if the odd parity occurs. Meanwhile, the systems in the even-parity instance can be used as the resource in the next round of our ECP. As the imperfect performances originated from the side leakage and the limited coupling strength of the cavity-QD system can be reflected by clicking the single-photon detectors, the fidelity of the PCG is unit, in principle, immune to strong coupling-strength restriction. Moreover, the success of our ECP not only is heralded by the detectors but also its efficiency further is improved by repeating the operation processes. Therefore, our ECP is useful in the quantum communication network.

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Error-detected three-photon hyperparallel Toffoli gate with state-selective reflection

Cited by 25 publications

References 68 publications

Simplified entanglement swapping protocol for the quantum Internet

Simplified entanglement swapping protocol for the quantum Internet

Faithful and efficient hyperentanglement purification for spatial-polarization-time-bin photon system

Compact entanglement concentration for three-electron-spin W states with error-detected parity-check gates

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