Parameter estimation with cluster states

Matthias Rosenkranz and Dieter Jaksch
Phys. Rev. A 79, 022103 – Published 4 February 2009

Abstract

We propose a scheme for parameter estimation with cluster states. We find that phase estimation with cluster states under a many-body Hamiltonian and separable measurements leads to a precision at the Heisenberg limit. As noise models we study the dephasing, depolarizing, and pure damping channels. Decoherence reduces the sensitivity but our scheme remains superior over several reference schemes with states such as maximally entangled states and product states. For small cluster states and fixed evolution times it remains at the Heisenberg limit for approximately 2 times as many qubits than alternative schemes.

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  • Received 9 December 2008

DOI:https://doi.org/10.1103/PhysRevA.79.022103

©2009 American Physical Society

Authors & Affiliations

Matthias Rosenkranz* and Dieter Jaksch

  • Clarendon Laboratory, University of Oxford, Parks Road, Oxford OX1 3PU, United Kingdom and Keble College, Parks Road, Oxford OX1 3PG, United Kingdom

  • *m.rosenkranz@physics.ox.ac.uk
  • URL: http://www.physics.ox.ac.uk/qubit/

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Issue

Vol. 79, Iss. 2 — February 2009

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