Coherent State Transfer between an Electron and Nuclear Spin in N15@C60

Richard M. Brown, Alexei M. Tyryshkin, Kyriakos Porfyrakis, Erik M. Gauger, Brendon W. Lovett, Arzhang Ardavan, S. A. Lyon, G. Andrew D. Briggs, and John J. L. Morton
Phys. Rev. Lett. 106, 110504 – Published 14 March 2011
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Abstract

Electron spin qubits in molecular systems offer high reproducibility and the ability to self-assemble into larger architectures. However, interactions between neighboring qubits are “always on,” and although the electron spin coherence times can be several hundred microseconds, these are still much shorter than typical times for nuclear spins. Here we implement an electron-nuclear hybrid scheme which uses coherent transfer between electron and nuclear spin degrees of freedom in order to both effectively turn on or off interqubit coupling mediated by dipolar interactions and benefit from the long nuclear spin decoherence times (T2n). We transfer qubit states between the electron and N15 nuclear spin in N15@C60 with a two-way process fidelity of 88%, using a series of tuned microwave and radio frequency pulses and measure a nuclear spin coherence lifetime of over 100 ms.

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  • Received 23 November 2010

DOI:https://doi.org/10.1103/PhysRevLett.106.110504

© 2011 American Physical Society

Authors & Affiliations

Richard M. Brown1,*, Alexei M. Tyryshkin2, Kyriakos Porfyrakis1, Erik M. Gauger1, Brendon W. Lovett3,1, Arzhang Ardavan4, S. A. Lyon2, G. Andrew D. Briggs1, and John J. L. Morton1,4

  • 1Department of Materials, Oxford University, Oxford OX1 3PH, United Kingdom
  • 2Department of Electrical Engineering, Princeton University, Princeton, New Jersey 08544, USA
  • 3School of Engineering and Physical Sciences, Heriot Watt University, Edinburgh EH14 4AS, United Kingdom
  • 4CAESR, Clarendon Laboratory, Department of Physics, Oxford University, Oxford OX1 3PU, United Kingdom

  • *richard.brown@materials.ox.ac.uk

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Vol. 106, Iss. 11 — 18 March 2011

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