Probing quantum phase transitions in a spin chain with a double quantum dot

Yun-Pil Shim, Sangchul Oh, Jianjia Fei, Xuedong Hu, and Mark Friesen
Phys. Rev. B 87, 155405 – Published 8 April 2013

Abstract

Quantum phase transitions (QPTs) in qubit systems are known to produce singularities in the entanglement, which could in turn be used to probe the QPT. Recent proposals have suggested that the QPT in a spin chain could be probed via the entanglement between external qubits coupled to the spin chain. Such experiments may be technically challenging, because the probe qubits are nonlocal. Here we show that a double quantum dot coupled locally to a spin chain provides an alternative and efficient probe of a QPT. To demonstrate this method in a simple geometry, we propose an experiment to observe a QPT in a triple quantum dot, based on the well-known singlet projection technique.

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  • Received 24 September 2012

DOI:https://doi.org/10.1103/PhysRevB.87.155405

©2013 American Physical Society

Authors & Affiliations

Yun-Pil Shim1,*, Sangchul Oh2, Jianjia Fei1, Xuedong Hu2, and Mark Friesen1

  • 1Department of Physics, University of Wisconsin-Madison, Madison, Wisconsin 53706, USA
  • 2Department of Physics, University at Buffalo, State University of New York, Buffalo, New York 14260, USA

  • *Current address: Laboratory for Physical Sciences, College Park, Maryland 20740, USA.

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Vol. 87, Iss. 15 — 15 April 2013

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