Fast Two-Qubit Gates in Semiconductor Quantum Dots using a Photonic Microcavity

Abstract

Implementations for quantum computing require fast single- and multi-qubit quantum gate operations. In the case of optically controlled quantum dot qubits theoretical designs for long-range two- or multi-qubit operations satisfying all the requirements in quantum computing are not yet available. We have developed a design for a fast, long-range two-qubit gate mediated by a photonic microcavity mode using excited states of the quantum dot-cavity system that addresses these needs. This design does not require identical qubits, it is compatible with available optically induced single qubit operations, and it advances opportunities for scalable architectures. We show that the gate fidelity can exceed 90% in experimentally accessible systems.

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Cited by in corpus (8)

• Quantum control of a spin qubit coupled to a photonic crystal cavity
• Hyper-parallel Toffoli gate on three-photon system with two degrees of freedom assisted by single-sided optical microcavities
• Solvable multistate model of Landau-Zener transitions in cavity QED
• Geometric phase gate for entangling two Bose-Einstein condensates
• Two-qubit quantum gates for defect qubits in diamond and similar systems
• Nuclear Electric Resonance for Spatially-Resolved Spin Control via Pulsed Optical Excitation in the UV-Visible Spectrum
• Excitation spectrum as a resource for efficient two-qubit entangling gates
• Preparation of a three-photon state in a nonlinear cavity - quantum dot system