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Quantum Simulation of a System with Competing Two- and Three-Body Interactions

Source: Phys. Rev. Lett. 103, 140501 (2009); doi:10.1103/PhysRevLett.103.140501

Published 29 September 2009

PACS
  • 03.67.Bg
    Entanglement production and manipulation (quantum information)
  • 03.65.Ud
    Entanglement and quantum nonlocality
  • 64.70.Tg
    Quantum phase transitions
  • 76.60.-k
    Nuclear magnetic resonance and relaxation (condensed matter)
  • YEAR: 2009
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PUBLICATION DATA
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Xinhua Peng,1,2 Jingfu Zhang,2 Jiangfeng Du,1 and Dieter Suter2
1Hefei National Laboratory for Physical Sciences at Microscale and Department of Modern Physics, University of Science and Technology of China, Hefei, Anhui 230026, People's Republic of China
2Fakultät Physik, Technische Universität Dortmund, 44221 Dortmund, Germany
Quantum phase transitions occur at zero temperature, when the ground state of a Hamiltonian undergoes a qualitative change as a function of a control parameter. We consider a particularly interesting system with competing one-, two-, and three-body interactions. Depending on the relative strength of these interactions, the ground state of the system can be a product state, or it can exhibit genuine tripartite entanglement. We experimentally simulate such a system in a NMR quantum simulator and observe the different ground states. By adiabatically changing the strength of one coupling constant, we push the system from one ground state to a qualitatively different ground state. We show that these ground states can be distinguished and the transitions between them observed by measuring correlations between the spins or the expectation values of suitable entanglement witnesses. ©2009 The American Physical Society
History: Received 1 September 2008; published 29 September 2009
Permalink: http://link.aps.org/abstract/PRL/v103/e140501

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