Quantum Metrology in Non-Markovian Environments

Details Quantum Metrology in Non-Markovian Environments Quantum Metrology in Non-Markovian Environments

2011-03-07

arxiv.org/abs/1103.1219v1

Physics

Quantum Physics

Scientific paper

We analyze optimal bounds for precision spectroscopy in the presence of general, non-Markovian phase noise. We demonstrate that the metrological equivalence of product and maximally entangled states that holds under Markovian dephasing fails in the non-Markovian case. Using an exactly solvable model of a physically realistic finite band-width dephasing environment, we show that the ensuing non-Markovian dynamics enables quantum correlated states to outperform metrological strategies based on uncorrelated states but otherwise identical resources. We show that this conclusion is a direct result of the coherent dynamics of the global state of the system and environment and, as a result, possesses general validity that goes beyond specific models.

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