Hyperparallel transistor, router and dynamic random access memory with unity fidelities

Liu, Jizhen; Chen, Ning-Yang; Liu, Wenqiang; Wei, Hai‐Rui; Hua, Ming

doi:10.1364/oe.27.021380

Opt. Express

2019

DOI: 10.1364/oe.27.021380

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Hyperparallel transistor, router and dynamic random access memory with unity fidelities

Jizhen Liu

Ning-Yang Chen

Wenqiang Liu

et al.

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Cited by 5 publications

(1 citation statement)

References 90 publications

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“…Moreover, hyperentangled states can be used to complete some tasks which are impossible to achieve with the single DOF, such as entanglement witness, 14) linear optical Bell-state analysis, 15) and one-way quantum computing. 16) Currently, hyperentangled cat states, 17) complete hyperentangled Bell-states and hyperentangled Greenberger-Horne-Zeilinger states analysis, 18,19) hyperentanglement purification 20) and concentration, 21) hyper-repeater, 22,23) and hyper-transistor, 24) and hyper-CNOT and hyper-Toffoli gates [25][26][27][28] have been proposed.…”

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confidence: 99%

Robust-fidelity hyperparallel controlled-phase-flip gate through microcavities

Wei

Zheng

Hua

et al. 2020

Appl. Phys. Express

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Hyperparallel quantum information processing outperforms its traditional parallel one in terms of channel capacity, low loss rate, and processing speed. We present a way for implementing a robust hyper-parallel optical controlled-phase-flip gate through microcavities. The gate acts on polarization and spatial degrees of freedom (DOFs) simultaneously, and the incomplete and undesired interactions between photons and quantum dots are prevented. Interestingly, the unity fidelity of the gate can be achieved in principle, and the success of the gate is heralded by the single-photon detectors.

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mentioning

confidence: 99%

Robust-fidelity hyperparallel controlled-phase-flip gate through microcavities

Wei

Zheng

Hua

et al. 2020

Appl. Phys. Express

Self Cite

View full text Add to dashboard Cite

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Deterministic CNOT gate and complete Bell-state analyzer on quantum-dot-confined electron spins based on faithful quantum nondemolition parity detection

Fan

Cao

2021

J. Opt. Soc. Am. B

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The quantum controlled-NOT (CNOT) gate is a prototypical two-qubit quantum logic gate that provides the basic controlled logic for a set of gates for universal quantum computation. It has been shown that parity checking devices can be used to construct CNOT gates, and the fidelity of a CNOT operation is highly constrained by the fidelity of parity detection with this strategy. In this paper, a scheme to implement a CNOT operation on two stationary electron spins confined in quantum dots (QDs) inside double-sided optical microcavities is presented, based on the faithful parity detection achieved by a heralded and robust two-electron-spin quantum nondemolition (QND) parity detector. The QND parity detector is considerably different from previous implementations and experimentally more realizable, and works in the heralded and repeat-until-success fashion with robust fidelity, which enables our CNOT gate to be implemented deterministically with unity fidelity. Moreover, based on the features of the QND parity detector, a complete Bell-state analysis on two QD-confined electron spins can be realized without wrong judgment or any destruction of the analyzed entangled state. The efficiency of parity detection is also discussed by considering currently achievable system parameters.

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Multipartite quantum entanglement creation for distant stationary systems

Wang

Xia

2020

Opt. Express

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We present efficient protocols for creating multipartite Greenberger-Horne-Zeilinger (GHZ) and W states of distant stationary qubits. The system nonuniformity and/or the non-ideal single-photon scattering usually limit the performance of entanglement creation, and result in the decrease of the fidelity and the efficiency in practical quantum information processing. By using linear optical elements, errors caused by the system nonuniformity and non-ideal photon scattering can be converted into heralded loss in our protocols. Thus, the fidelity of generated multipartite entangled states keeps unchanged and only the efficiency decreases. The GHZ state of distant stationary qubits is created in a parallel way that its generation efficiency considerably increases. In the protocol for creating the W state of N distant stationary qubits, an input single photon is prepared in a superposition state and sent into N paths parallelly. We use the two-spatial-mode interferences to eliminate the “which path” single-photon scattering “knowledge”. As a result, the efficiency of creating the N-qubit W state is independent of the number of stationary qubits rather than exponentially decreases.

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Hyperparallel transistor, router and dynamic random access memory with unity fidelities

Cited by 5 publications

References 90 publications

Robust-fidelity hyperparallel controlled-phase-flip gate through microcavities

Robust-fidelity hyperparallel controlled-phase-flip gate through microcavities

Deterministic CNOT gate and complete Bell-state analyzer on quantum-dot-confined electron spins based on faithful quantum nondemolition parity detection

Multipartite quantum entanglement creation for distant stationary systems

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