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Title: Experimental detection of nonclassical correlations in mixed-state quantum computation

Abstract

We report on an experiment to detect nonclassical correlations in a highly mixed state. The correlations are characterized by the quantum discord and are observed using four qubits in a liquid-state nuclear magnetic resonance quantum information processor. The state analyzed is the output of a DQC1 computation, whose input is a single quantum bit accompanied by n maximally mixed qubits. This model of computation outperforms the best known classical algorithms and, although it contains vanishing entanglement, it is known to have quantum correlations characterized by the quantum discord. This experiment detects nonvanishing quantum discord, ensuring the existence of nonclassical correlations as measured by the quantum discord.

Authors:
; ;  [1];  [1]
  1. Institute for Quantum Computing and Department of Physics, University of Waterloo, Waterloo, Ontario, N2L 3G1 (Canada)
Publication Date:
OSTI Identifier:
22093412
Resource Type:
Journal Article
Journal Name:
Physical Review. A
Additional Journal Information:
Journal Volume: 84; Journal Issue: 4; Other Information: (c) 2011 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 1050-2947
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; ALGORITHMS; CALCULATION METHODS; CORRELATIONS; MIXED STATE; NUCLEAR MAGNETIC RESONANCE; QUANTUM COMPUTERS; QUANTUM ENTANGLEMENT; QUANTUM MECHANICS; QUBITS

Citation Formats

Passante, G., Moussa, O., Trottier, D. A., Laflamme, R., and Perimeter Institute for Theoretical Physics, Waterloo, Ontario, N2J 2W9. Experimental detection of nonclassical correlations in mixed-state quantum computation. United States: N. p., 2011. Web. doi:10.1103/PHYSREVA.84.044302.
Passante, G., Moussa, O., Trottier, D. A., Laflamme, R., & Perimeter Institute for Theoretical Physics, Waterloo, Ontario, N2J 2W9. Experimental detection of nonclassical correlations in mixed-state quantum computation. United States. https://doi.org/10.1103/PHYSREVA.84.044302
Passante, G., Moussa, O., Trottier, D. A., Laflamme, R., and Perimeter Institute for Theoretical Physics, Waterloo, Ontario, N2J 2W9. Sat . "Experimental detection of nonclassical correlations in mixed-state quantum computation". United States. https://doi.org/10.1103/PHYSREVA.84.044302.
@article{osti_22093412,
title = {Experimental detection of nonclassical correlations in mixed-state quantum computation},
author = {Passante, G. and Moussa, O. and Trottier, D. A. and Laflamme, R. and Perimeter Institute for Theoretical Physics, Waterloo, Ontario, N2J 2W9},
abstractNote = {We report on an experiment to detect nonclassical correlations in a highly mixed state. The correlations are characterized by the quantum discord and are observed using four qubits in a liquid-state nuclear magnetic resonance quantum information processor. The state analyzed is the output of a DQC1 computation, whose input is a single quantum bit accompanied by n maximally mixed qubits. This model of computation outperforms the best known classical algorithms and, although it contains vanishing entanglement, it is known to have quantum correlations characterized by the quantum discord. This experiment detects nonvanishing quantum discord, ensuring the existence of nonclassical correlations as measured by the quantum discord.},
doi = {10.1103/PHYSREVA.84.044302},
url = {https://www.osti.gov/biblio/22093412}, journal = {Physical Review. A},
issn = {1050-2947},
number = 4,
volume = 84,
place = {United States},
year = {2011},
month = {10}
}