Self-error-rejecting multipartite entanglement purification for electron systems assisted by quantum-dot spins in optical microcavities

Liu, Yong-Ting; Wu, Yiming; Du, Fangfang

doi:10.1088/1674-1056/ac4489

Cited by 7 publications

(4 citation statements)

References 67 publications

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“…[42] It is considered one of the most promising candidates for realizing nonlinear interactions in solid-state quantum systems. [43,44] QD-cavity coupled system enables various quantum information processing tasks, including entanglement generation, [45,46] entanglement analysis, [47,48] entanglement swapping, [49,50] entanglement purification, [51,52] entanglement concentration, [35,53] quantum repeaters, [54,55] and quantum gates. [35,[56][57][58][59][60] An electron-system PCG was constructed in two optical microcavities.…”

Section: Introductionmentioning

confidence: 99%

A Two‐Step Entanglement Concentration for the Less‐Entangled Four‐Photon Cluster States

Yang,

Xiu,

et al. 2024

Adv Quantum Tech

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Entanglement concentration serves as an essential tool to obtain the maximally entangled states from the less‐entangled states in quantum information processing tasks. An efficient two‐step entanglement concentration protocol (ECP) is proposed to concentrate the less‐entangled four‐photon cluster states with four unknown coefficients into the maximally entangled states in this paper. The protocol utilizes parity‐check gate and photon‐polarized controlled‐Z gate, constructed with a single semiconductor quantum dot in a single optical microcavity (quantum dot‐cavity coupled system) and several linear optical elements. The discarded quantum states can be recycled in the next round concentration to achieve a higher success probability. Under conditions of strong coupling and weak side leakage rate, the ECP can tend toward ideal fidelity and efficiency. Compared to the previously proposed ECPs that utilize various auxiliary tools such as additional entangled states and complex quantum logic gates, the ECP significantly simplifies the analysis process and enables efficient implementation. Thus, the ECP is more economical and feasible in future optical systems.

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Section: Introductionmentioning

confidence: 99%

A Two‐Step Entanglement Concentration for the Less‐Entangled Four‐Photon Cluster States

Yang,

Xiu,

et al. 2024

Adv Quantum Tech

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“…One trenchant method to prevent the degradation of entanglement is entanglement concentration protocol (ECP), which is used to distill maximally entangled states from partially entangled pure states, in particular the imperfect entangled source or decoherence of entanglement from the storage process. Another efficacious one is entanglement purification protocol (EPP), which is used to increase the fidelity of required maximally entangled state in mixed entangled state, including EPPs based on controlled-not gate (or parity check gate, PCG) [24][25][26][27][28][29][30][31][32][33][34][35], deterministic EPPs [36][37][38], measurementbased EPPs [39][40][41][42][43], and hyperentanglement-assisted EPPs [44][45][46], which is applied to get maximally entangled states with higher fidelity from the mixed entangled states.…”

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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“…However, when it turns into realistic condition, the practical scattering becomes imperfect, which would lead to computation errors appearing in the result of the quantum gate in company with the reduced fidelity [73] and may accordingly reduce the quality of the entanglement distillation accomplished with quantum gates. [74,75] That is to say, the performance of the quantum gates is restricted by the realistic condition such as coupling strength, cavity leakage and frequency difference. For improving the performance of quantum gates in the realistic condition and relaxing the requirement for experiment, it is worthy to seek ways for implementing quantum gates working with fewer computation errors and higher fidelity in the realistic condition via different methods.…”

Section: Introductionmentioning

confidence: 99%

High-fidelity universal quantum gates for hybrid systems via the practical photon scattering

Luo

Wang

2023

Chinese Phys. B

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High-fidelity quantum logic gates are essential in quantum computation, and both photons and electron spins in quantum dots (QDs) have their own unique advantages in implementing quantum computation. It is of critical significance to achieve high-fidelity quantum gates for photon-QD hybrid systems. Here, we propose two schemes for implementing high-fidelity universal quantum gates including Toffoli gate and Fredkin gate for photon-QD hybrid systems, utilizing the practical scattering of a single photon off a QD-cavity system. The computation errors from the imperfections involved in the practical scattering are detected and prevented from arising in the final results of the two gates. Accordingly, the unity fidelity of each quantum gate is obtained in the nearly realistic condition, and the requirement for experimental realization is relaxed. Furthermore, the quantum circuits for the two gates are compact and no auxiliary qubits are required, which would be also the advantages regarding their experimental feasibility. These features indicate that our schemes may be useful in the practical quantum computation tasks.

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Self-error-rejecting multipartite entanglement purification for electron systems assisted by quantum-dot spins in optical microcavities

Cited by 7 publications

References 67 publications

A Two‐Step Entanglement Concentration for the Less‐Entangled Four‐Photon Cluster States

A Two‐Step Entanglement Concentration for the Less‐Entangled Four‐Photon Cluster States

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

High-fidelity universal quantum gates for hybrid systems via the practical photon scattering

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