Scalable photonic quantum computing assisted by quantum-dot spin in double-sided optical microcavity

Abstract

We investigate the possibility to achieve scalable photonic quantum computing by the giant optical circular birefringence induced by a quantum-dot spin in a double-sided optical microcavity as a result of cavity quantum electrodynamics. We construct a deterministic controlled-not gate on two photonic qubits by two single-photon input-output processes and the readout on an electron-medium spin confined in an optical resonant microcavity. This idea could be applied to multi-qubit gates on photonic qubits and we give the quantum circuit for a three-photon Toffoli gate. High fidelities and high efficiencies could be achieved when the side leakage to the cavity loss rate is low. It is worth pointing out that our devices work in both the strong and the weak coupling regimes.

13 pages, 5 figures

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• Universal quantum gates on microwave photons assisted by circuit quantum electrodynamics
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• Hyper-parallel Toffoli gate on three-photon system with two degrees of freedom assisted by single-sided optical microcavities
• Self-error-corrected hyperparallel photonic quantum computation working with both the polarization and the spatial-mode degrees of freedom
• Can A Universal Quantum Cloner Be Used to Design an Experimentally Feasible Near-Deterministic CNOT Gate ?
• Universal distributed quantum computing on superconducting qutrits with dark photons
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• Multiple multi-control unitary operations: implementation and applications
• CNOT gate on reverse photon modes in ring cavity
• Universal quantum gates for photon-atom hybrid systems assisted by bad cavities
• Universal quantum gates on electron-spin qubits with quantum dots inside single-side optical microcavities