Scalable quantum computing based on stationary spin qubits in coupled quantum dots inside double-sided optical microcavities

Abstract

Quantum logic gates are the key elements in quantum computing. Here we investigate the possibility of achieving a scalable and compact quantum computing based on stationary electron-spin qubits, by using the giant optical circular birefringence induced by quantum-dot spins in double-sided optical microcavities as a result of cavity quantum electrodynamics. We design the compact quantum circuits for implementing universal and deterministic quantum gates for electron-spin systems, including the two-qubit CNOT gate and the three-qubit Toffoli gate. They are compact and economic, and they do not require additional electron-spin qubits. Moreover, our devices have good scalability and are attractive as they both are based on solid-state quantum systems and the qubits are stationary. They are feasible with the current experimental technology, and both high fidelity and high efficiency can be achieved when the ratio of the side leakage to the cavity decay is low.

12 pages, 5 figures, one column

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• Circuit QED: single-step realization of a multiqubit controlled phase gate with one microwave photonic qubit simultaneously controlling $n-1$ microwave photonic qubits
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• Nonunitary Gate Operations by Dissipation Engineering
• The strange attraction phenomenon in cQED: the intermediate quantum coupling regime
• Effect of phonon coupling on cooperative two-photon emission from two-quantum dots
• Multiple multi-control unitary operations: implementation and applications
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• Quantum repeaters based on individual electron spins and nuclear-spin-ensemble memories in quantum dots