The Zeno limit in frequency estimation with non-Markovian environments

2014/03/06 by Macieszczak, Katarzyna · 1 citation
#FOS: Physical sciences #Quantum Physics (quant-ph)

paper · doi:10.48550/arxiv.1403.1333

Abstract

We prove the Zeno limit N^3/2 of the quantum Fisher information for frequency estimation with a general initial state of N two-level atoms in the presence of local non-Markovian dephasing noise, which was demonstrated for a GHZ state by A. W. Chin, S. F. Huelga, M. B. Plenio (2012). For collective dephasing we prove that non-Markovian noise allows for better scaling for both correlated and uncorelated states. The quantum enhancement in precision is at least as good as in the local case.

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• Optimal phase estimation in the presence of correlated dephasing

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