Weak measurement and control of entanglement generation

Charles Hill and Jason Ralph
Phys. Rev. A 77, 014305 – Published 25 January 2008

Abstract

In this paper we show how weak measurement and local feedback can be used to control entanglement generation between two qubits. To do this, we make use of a decoherence free subspace. Weak measurement and feedback can be used to drive the system into this subspace rapidly. Once within the subspace, feedback can generate entanglement rapidly, or turn off entanglement generation dynamically. We also consider, in the context of weak measurement, some of the differences between purification and generating entanglement.

  • Figure
  • Received 27 September 2007

DOI:https://doi.org/10.1103/PhysRevA.77.014305

©2008 American Physical Society

Authors & Affiliations

Charles Hill* and Jason Ralph

  • Department of Electrical Engineering and Electronics, University of Liverpool, Brownlow Hill, Liverpool, L69 3GJ, United Kingdom

  • *charles.hill@liverpool.ac.uk
  • jfralph@liverpool.ac.uk

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Issue

Vol. 77, Iss. 1 — January 2008

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