Quantum-Dot-Based Resonant Exchange Qubit

J. Medford, J. Beil, J. M. Taylor, E. I. Rashba, H. Lu, A. C. Gossard, and C. M. Marcus
Phys. Rev. Lett. 111, 050501 – Published 31 July 2013
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Abstract

We introduce a solid-state qubit in which exchange interactions among confined electrons provide both the static longitudinal field and the oscillatory transverse field, allowing rapid and full qubit control via rf gate-voltage pulses. We demonstrate two-axis control at a detuning sweet spot, where leakage due to hyperfine coupling is suppressed by the large exchange gap. A π/2-gate time of 2.5 ns and a coherence time of 19μs, using multipulse echo, are also demonstrated. Model calculations that include effects of hyperfine noise are in excellent quantitative agreement with experiment.

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  • Received 11 April 2013

DOI:https://doi.org/10.1103/PhysRevLett.111.050501

© 2013 American Physical Society

Authors & Affiliations

J. Medford1, J. Beil2, J. M. Taylor3, E. I. Rashba1, H. Lu4, A. C. Gossard4, and C. M. Marcus2

  • 1Department of Physics, Harvard University, Cambridge, Massachusetts 02138, USA
  • 2Center for Quantum Devices, Niels Bohr Institute, University of Copenhagen, Universitetsparken 5, 2100 Copenhagen, Denmark
  • 3Joint Quantum Institute/NIST, College Park, Maryland 20742, USA
  • 4Materials Department, University of California, Santa Barbara, California 93106, USA

See Also

Electrically Protected Resonant Exchange Qubits in Triple Quantum Dots

J. M. Taylor, V. Srinivasa, and J. Medford
Phys. Rev. Lett. 111, 050502 (2013)

Two-Qubit Gates for Resonant Exchange Qubits

Andrew C. Doherty and Matthew P. Wardrop
Phys. Rev. Lett. 111, 050503 (2013)

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Vol. 111, Iss. 5 — 2 August 2013

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