In recent years, several estimation strategies have been formulated to determine the value of an unknown parameter in the most precise way, taking into account the presence of noise. These strategies typically rely on the use of quantum entanglement between the sensing probes and they have been shown to be optimal in the asymptotic limit in the number of probes, as long as one performs measurements on shorter and shorter time scales. Here, we present a different approach to frequency estimation, which exploits quantum coherence in the state of each sensing particle in the long time limit and is obtained by properly engineering the environment. By means of a commonly used master equation, we show that our strategy can overcome the precision achievable with entanglement-based strategies for a finite number of probes. We discuss a possible implementation of the scheme in a realistic setup that uses trapped ions as quantum sensors.

Improving the precision of frequency estimation via long-time coherences / A. Smirne, A. Lemmer, M.B. Plenio, S.F. Huelga. - In: QUANTUM SCIENCE AND TECHNOLOGY. - ISSN 2058-9565. - 4:2(2019), pp. 025004.1-025004.11. [10.1088/2058-9565/aaf43d]

Improving the precision of frequency estimation via long-time coherences

A. Smirne
;
2019

Abstract

In recent years, several estimation strategies have been formulated to determine the value of an unknown parameter in the most precise way, taking into account the presence of noise. These strategies typically rely on the use of quantum entanglement between the sensing probes and they have been shown to be optimal in the asymptotic limit in the number of probes, as long as one performs measurements on shorter and shorter time scales. Here, we present a different approach to frequency estimation, which exploits quantum coherence in the state of each sensing particle in the long time limit and is obtained by properly engineering the environment. By means of a commonly used master equation, we show that our strategy can overcome the precision achievable with entanglement-based strategies for a finite number of probes. We discuss a possible implementation of the scheme in a realistic setup that uses trapped ions as quantum sensors.
open quantum systems; quantum coherence; Quantum metrology
Settore FIS/03 - Fisica della Materia
Settore FIS/02 - Fisica Teorica, Modelli e Metodi Matematici
https://iopscience.iop.org/article/10.1088/2058-9565/aaf43d/pdf
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2434/676173
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