A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä

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

Julkaisun tekijät: Francesco Albarelli, Matteo A. C. Rossi, Marco G. Genoni

Kustantaja: World Scientific Publishing Co. Pte. Ltd.

Julkaisuvuosi: 2020

Journal: International Journal of Quantum Information

Volyymi: 18

Julkaisunumero: 1

eISSN: 1793-6918

DOI: http://dx.doi.org/10.1142/S0219749919410132

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


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 2021-10-08 at 09:29