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Quantum frequency estimation with conditional states of continuously monitored independent dephasing channels




TekijätFrancesco Albarelli, Matteo A. C. Rossi, Marco G. Genoni

KustantajaWorld Scientific Publishing Co. Pte. Ltd.

Julkaisuvuosi2020

JournalInternational Journal of Quantum Information

Artikkelin numero1941013

Vuosikerta18

Numero1

eISSN1793-6918

DOIhttps://doi.org/10.1142/S0219749919410132

Verkko-osoitehttps://www.worldscientific.com/doi/abs/10.1142/S0219749919410132

Rinnakkaistallenteen osoitehttps://research.utu.fi/converis/portal/detail/Publication/45415139


Tiivistelmä

We discuss the problem of estimating a frequency via N-qubit probes undergoing independent dephasing channels that can be continuously monitored via homodyne or photo-detection. We derive the corresponding analytical solutions for the conditional states, for generic initial states and for arbitrary efficiency of the continuous monitoring. For the detection strategies considered, we show that: (i) in the case of perfect continuous detection, the quantum Fisher information (QFI) of the conditional states is equal to the one obtained in the noiseless dynamics; (ii) for smaller detection efficiencies, the QFI of the conditional state is equal to the QFI of a state undergoing the (unconditional) dephasing dynamics, but with an effectively reduced noise parameter.


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Last updated on 2024-26-11 at 11:41