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Reduced Sensitivity to Charge Noise in Semiconductor Spin Qubits via Symmetric Operation

M. D. Reed, B. M. Maune, R. W. Andrews, M. G. Borselli, K. Eng, M. P. Jura, A. A. Kiselev, T. D. Ladd, S. T. Merkel, I. Milosavljevic, E. J. Pritchett, M. T. Rakher, R. S. Ross, A. E. Schmitz, A. Smith, J. A. Wright, M. F. Gyure, and A. T. Hunter
Phys. Rev. Lett. 116, 110402 – Published 16 March 2016
Physics logo See Synopsis: Even-Handed Control of Quantum Dot Qubits
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Abstract

We demonstrate improved operation of exchange-coupled semiconductor quantum dots by substantially reducing the sensitivity of exchange operations to charge noise. The method involves biasing a double dot symmetrically between the charge-state anticrossings, where the derivative of the exchange energy with respect to gate voltages is minimized. Exchange remains highly tunable by adjusting the tunnel coupling. We find that this method reduces the dephasing effect of charge noise by more than a factor of 5 in comparison to operation near a charge-state anticrossing, increasing the number of observable exchange oscillations in our qubit by a similar factor. Performance also improves with exchange rate, favoring fast quantum operations.

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  • Received 5 August 2015

DOI:https://doi.org/10.1103/PhysRevLett.116.110402

This article is available under the terms of the Creative Commons Attribution 3.0 License. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI.

Published by the American Physical Society

Physics Subject Headings (PhySH)

General PhysicsCondensed Matter, Materials & Applied PhysicsQuantum Information, Science & Technology

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Even-Handed Control of Quantum Dot Qubits

Published 16 March 2016

A new way to control the coupling of spins between adjacent quantum dots produces qubits that are less susceptible to electronic noise.

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See Also

Filter function formalism beyond pure dephasing and non-Markovian noise in singlet-triplet qubits

Edwin Barnes, Mark S. Rudner, Frederico Martins, Filip K. Malinowski, Charles M. Marcus, and Ferdinand Kuemmeth
Phys. Rev. B 93, 121407(R) (2016)

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Vol. 116, Iss. 11 — 18 March 2016

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