Efficient controlled-phase gate for single-spin qubits in quantum dots

Journal article (2011)
Department
QN/Quantum Nanoscience (AS) (TU Delft)
Copyright: American Physical Society
DOI: https://doi.org/doi:10.1103/PhysRevB.83.121403
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Published Date

10-03-2011

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Source:

Physical Review B, 83 (12), 2011

Faculty

Applied Sciences

Department

QN/Quantum Nanoscience

Abstract

Two-qubit interactions are at the heart of quantum information processing. For single-spin qubits in semiconductor quantum dots, the exchange gate has always been considered the natural two-qubit gate. The recent integration of a magnetic field or g-factor gradients in coupled quantum dot systems allows for a one-step, robust realization of the controlled-phase (C-phase) gate instead. We analyze the C-phase gate durations and fidelities that can be obtained under realistic conditions, including the effects of charge and nuclear field fluctuations, and find gate error probabilities of below 10-4, possibly allowing fault-tolerant quantum computation.

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