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Title: Quantum Logic via the Exchange Blockade in Ultracold Collisions

Abstract

A nuclear spin can act as a quantum switch that turns on or off ultracold collisions between atoms even when there is neither interaction between nuclear spins nor between the nuclear and electron spins. This ''exchange blockade'' is a new mechanism for implementing quantum logic gates that arises from the symmetry of composite identical particles, rather than direct coupling between qubits. We study the implementation of the entangling {radical}(SWAP) gate based on this mechanism for a model system of two atoms, each with ground electronic configuration {sup 1}S{sub 0}, spin 1/2 nuclei, and trapped in optical tweezers. We evaluate a proof-of-principle protocol based on adiabatic evolution of a one-dimensional double Gaussian well, calculating fidelities of operation as a function of interaction strength, gate time, and temperature.

Authors:
;  [1];  [2]
  1. Department of Physics and Astronomy, University of New Mexico, Albuquerque, New Mexico 87131 (United States)
  2. Atomic Physics Division, National Institute of Standards and Technology, Gaithersburg, Maryland 20899-8423 (United States)
Publication Date:
OSTI Identifier:
20955457
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review Letters; Journal Volume: 98; Journal Issue: 7; Other Information: DOI: 10.1103/PhysRevLett.98.070501; (c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; COLLISIONS; ELECTRONIC STRUCTURE; ELECTRONS; QUANTUM MECHANICS; QUBITS; SPIN; SWITCHES; SYMMETRY; TRAPPING

Citation Formats

Hayes, David, Deutsch, Ivan H., and Julienne, Paul S. Quantum Logic via the Exchange Blockade in Ultracold Collisions. United States: N. p., 2007. Web. doi:10.1103/PHYSREVLETT.98.070501.
Hayes, David, Deutsch, Ivan H., & Julienne, Paul S. Quantum Logic via the Exchange Blockade in Ultracold Collisions. United States. doi:10.1103/PHYSREVLETT.98.070501.
Hayes, David, Deutsch, Ivan H., and Julienne, Paul S. Fri . "Quantum Logic via the Exchange Blockade in Ultracold Collisions". United States. doi:10.1103/PHYSREVLETT.98.070501.
@article{osti_20955457,
title = {Quantum Logic via the Exchange Blockade in Ultracold Collisions},
author = {Hayes, David and Deutsch, Ivan H. and Julienne, Paul S.},
abstractNote = {A nuclear spin can act as a quantum switch that turns on or off ultracold collisions between atoms even when there is neither interaction between nuclear spins nor between the nuclear and electron spins. This ''exchange blockade'' is a new mechanism for implementing quantum logic gates that arises from the symmetry of composite identical particles, rather than direct coupling between qubits. We study the implementation of the entangling {radical}(SWAP) gate based on this mechanism for a model system of two atoms, each with ground electronic configuration {sup 1}S{sub 0}, spin 1/2 nuclei, and trapped in optical tweezers. We evaluate a proof-of-principle protocol based on adiabatic evolution of a one-dimensional double Gaussian well, calculating fidelities of operation as a function of interaction strength, gate time, and temperature.},
doi = {10.1103/PHYSREVLETT.98.070501},
journal = {Physical Review Letters},
number = 7,
volume = 98,
place = {United States},
year = {Fri Feb 16 00:00:00 EST 2007},
month = {Fri Feb 16 00:00:00 EST 2007}
}