A heralded and error-rejecting three-photon hyper-parallel quantum gate through cavity-assisted interactions

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

doi:10.1038/s41598-018-20148-z

Cited by 9 publications

(2 citation statements)

References 75 publications

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“…In 2016, another proposal for errordetected generating and complete analysing of hyperentangled Bell states with quantum dot (QD)-double-sided system was proposed. [54] Subsequently, several error-rejecting schemes for quantum repeaters, [55][56][57][58][59][60] quantum logic gates, [61][62][63][64][65] and entanglement generation [66] have been proposed, in which computational errors are heralded by single photon detections, resulting a unity operation fidelity, which is a highly desirable feature for quantum communication or computation.…”

Section: Introductionmentioning

confidence: 99%

Error-detected single-photon quantum routing using a quantum dot and a double-sided microcavity system

et al. 2019

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Based on a hybrid system consisting of a quantum dot coupled with a double-sided micropillar cavity, we investigate the implementation of an error-detected photonic quantum routing controlled by the other photon. The computational errors from unexpected experimental imperfections are heralded by single photon detections, resulting in a unit fidelity for the present scheme, so that this scheme is intrinsically robust. We discuss the performance of the scheme with currently achievable experimental parameters. Our results show that the present scheme is efficient. Furthermore, our scheme could provide a promising building block for quantum networks and distributed quantum information processing in the future.

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Section: Introductionmentioning

confidence: 99%

Error-detected single-photon quantum routing using a quantum dot and a double-sided microcavity system

et al. 2019

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“…Based on that, quantum gates on electron-spin qubits [49][50][51][52][53][54][55] or on hybrid photon-spin systems [56,57] could be implemented. Also, the QD-cavity systems can be used to assist photonic QIP, such as photonic entanglement generation [58][59][60], complete Bell-state analysis [59][60][61][62][63], entanglement purification and concentration [64][65][66][67], deterministic quantum repeaters [68][69][70], and quantum gates [71][72][73][74][75][76]. In 2013, Ren et al [71] constructed a deterministic hyper-CNOT gate operating in both the polarization and spatial-mode DOFs for a photon pair simultaneously, assisted by a QD inside a single-sided optical microcavity.…”

Section: Introductionmentioning

confidence: 99%

Universal photonic three-qubit quantum gates with two degrees of freedom assisted by charged quantum dots inside single-sided optical microcavities

et al. 2018

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Although universal quantum computation can be realized with two-qubit controlled-not (CNOT) gates and single-qubit rotations, it would be convenient to have resource-efficient and robust multiqubit quantum gates in practical quantum information processing. Here we present two new schemes to determinately implement three-qubit Toffoli gate and Fredkin gate on photon systems with two degrees of freedom (DOFs), assisted by charged quantum dots (QDs) inside single-sided optical microcavities. In contrast to the traditional Toffoli and Fredkin gates operating in photonic one DOF, the gates presented here with two DOFs can reduce the photon numbers required to implement the gate operations. Compared with the ones synthesized by CNOT and single-qubit gates, the present gates can reduce the complexity in experiment. Our schemes exploit the robust giant circular birefringence induced by a singleelectron spin in a QD-cavity system, which do not require photon indistinguishability or photon interference as demanded by other schemes using linear optics. Moreover, additional ancillary photons are not required in the schemes. We discuss the feasibility of our schemes, concluding that they can be realized with current or near-future technologies.

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High‐Fidelity Universal Quantum Controlled Gates on Electron‐Spin Qubits in Quantum Dots Inside Single‐Sided Optical Microcavities

et al. 2019

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Semiconductor quantum‐dot (QD) spins hold great promise in quantum information science and technology. The implementation of high‐fidelity quantum gates on QD‐spin qubits is of great importance. Here, two schemes are presented to implement two universal quantum controlled gates, that is, the two‐qubit controlled‐not gate and the three‐qubit Toffoli gate, on stationary electron‐spin qubits in QDs inside single‐sided optical microcavities, based on the cavity‐assisted photon scattering under the balance condition. Compared with the previous schemes based on the ideal giant circular birefringence, the present schemes use the balance condition of the single‐sided QD‐cavity system, which can be achieved in both the weak‐ and strong‐coupling regimes of cavity quantum electrodynamics. Under the balance condition, the noise caused by the unbalanced reflectance between the coupled and uncoupled QD‐cavity systems can be efficiently depressed, so that the fidelity of each quantum gate operation can be increased to unity in principle. The schemes exhibit the possibility of realizing high‐fidelity and scalable quantum computing with single QD spins and single photons using the feasible and robust light–matter quantum interface. These high‐fidelity quantum controlled gates can lead to more efficient construction of quantum circuits for quantum computing, and provide a convenient avenue for quantum networking.

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A heralded and error-rejecting three-photon hyper-parallel quantum gate through cavity-assisted interactions

Cited by 9 publications

References 75 publications

Error-detected single-photon quantum routing using a quantum dot and a double-sided microcavity system

Error-detected single-photon quantum routing using a quantum dot and a double-sided microcavity system

Universal photonic three-qubit quantum gates with two degrees of freedom assisted by charged quantum dots inside single-sided optical microcavities

High‐Fidelity Universal Quantum Controlled Gates on Electron‐Spin Qubits in Quantum Dots Inside Single‐Sided Optical Microcavities

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