Measuring errors in single-qubit rotations by pulsed electron paramagnetic resonance

John J. L. Morton, Alexei M. Tyryshkin, Arzhang Ardavan, Kyriakos Porfyrakis, S. A. Lyon, and G. Andrew D. Briggs

Phys. Rev. A 71, 012332 – Published 26 January 2005

Abstract

The ability to measure and reduce systematic errors in single-qubit logic gates is crucial when evaluating quantum computing implementations. We describe pulsed electron paramagnetic resonance (EPR) sequences that can be used to measure precisely even small systematic errors in rotations of electron-spin-based qubits. Using these sequences we obtain values for errors in the rotation angle and axis for single-qubit rotations using a commercial EPR spectrometer. We conclude that errors in qubit operations by pulsed EPR are not limiting factors in the implementation of electron-spin-based quantum computers.

Received 4 March 2004

DOI:https://doi.org/10.1103/PhysRevA.71.012332

Authors & Affiliations

John J. L. Morton^1,*, Alexei M. Tyryshkin², Arzhang Ardavan^1,3, Kyriakos Porfyrakis¹, S. A. Lyon², and G. Andrew D. Briggs¹

¹Department of Materials, Oxford University, Oxford OX1 3PH, United Kingdom
²Department of Electrical Engineering, Princeton University, Princeton, New Jersey 08544, USA
³Clarendon Laboratory, Department of Physics, Oxford University, Oxford OX1 3PU, United Kingdom

^*Electronic address: john.morton@materials.ox.ac.uk

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Vol. 71, Iss. 1 — January 2005

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