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Quantum gate operations using midinfrared binary shaped pulses on the rovibrational states of carbon monoxide

Source: J. Chem. Phys. 132, 014307 (2010); doi:10.1063/1.3290957

Published 6 January 2010

KEYWORDS and PACS
Keywords
PACS
  • 33.80.-b
    Photon interactions with molecules
  • 03.67.Lx
    Quantum computation architectures and implementations
  • 33.15.Mt
    Molecular rotation, vibration, and vibration-rotation constants
  • YEAR: 2010
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PUBLICATION DATA
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Ryan R. Zaari and Alex Brown
Department of Chemistry, University of Alberta, Edmonton, Alberta T6G 2G2, Canada
Frequency domain shaped binary laser pulses were optimized to perform 2 qubit quantum gate operations in 12C16O. The qubit rovibrational state representation was chosen so that all gate operations consisted of one-photon transitions. The amplitude and phase varied binary pulses were determined using a genetic algorithm optimization routine. Binary pulses have two possible amplitudes, 0 or 1, and two phases, 0 or pi, for each frequency component of the pulse. Binary pulses are the simplest to shape experimentally and provide a minimum fidelity limit for amplitude and phase shaped pulses. With the current choice of qubit representation and using optimized binary pulses, fidelities of 0.80 and as high as 0.97 were achieved for the controlled-NOT and alternative controlled-NOT quantum gates. This indicates that with a judicious choice of qubits, most of the required control can be obtained with a binary pulse. Limited control was observed for 2 qubit NOT and Hadamard gates due to the need to control multiple excitations. The current choice of qubit representation produces pulses with decreased energies and superior fidelities when compared with rovibrational qubit representations consisting of two-photon transitions. The choice of input pulse energy is important and applying pulses of increased energy does not necessarily lead to a better fidelity. ©2010 American Institute of Physics
History: Received 13 October 2009; accepted 18 December 2009; published 6 January 2010
Permalink: http://link.aip.org/link/?JCPSA6/132/014307/1

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