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Demonstration of open-quantum-system optimal control in dynamic nuclear polarization

S. Sheldon and D. G. Cory
Phys. Rev. A 92, 042102 – Published 6 October 2015

Abstract

Dynamic nuclear polarization (DNP) is used in nuclear magnetic resonance to transfer polarization from electron spins to nuclear spins. The resulting nuclear polarization enhancement can, in theory, be two or three orders of magnitude depending on the sample. In solid-state systems, however, there are competing mechanisms of DNP, which, when occurring simultaneously, reduce the net polarization enhancement of the nuclear spin. We present a simple quantum description of DNP and apply optimal control theory (OCT) with an open-quantum-system framework to design pulses that select one DNP process and suppress the others. We demonstrate experimentally an order of magnitude improvement in the DNP enhancement using OCT pulses.

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  • Received 10 July 2015

DOI:https://doi.org/10.1103/PhysRevA.92.042102

©2015 American Physical Society

Authors & Affiliations

S. Sheldon1,2,3,* and D. G. Cory2,4,5,6

  • 1Department of Nuclear Science and Engineering, MIT, Cambridge, Massachusetts 02139, USA
  • 2Institute for Quantum Computing, University of Waterloo, Waterloo, Ontario, Canada N2L 3G1
  • 3IBM T.J. Watson Research Center, Yorktown Heights, New York 10598, USA
  • 4Canadian Institute for Advanced Research, Toronto, Ontario, Canada M5G 1Z8
  • 5Department of Chemistry, University of Waterloo, Waterloo, Ontario, Canada N2L 3G1
  • 6Perimeter Institute for Theoretical Physics, Waterloo, Ontario, Canada N2L 2Y5

  • *ssheldo@us.ibm.com

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Vol. 92, Iss. 4 — October 2015

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