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Proceedings Paper

Adaptive quantum metrology under general Markovian dynamics (Conference Presentation)
Author(s): Rafal Demkowicz-Dobrzanski; Pavel Sekatski; Jan Czajkowski
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Paper Abstract

We derive an explicit condition that determines whether in a noisy quantum frequency estimation problem the estimation precision of the most general adaptive quantum metrological protocol cannot reach the Heisenberg-like scaling. The condition is a simple algebraic statement on a relation between the Hamiltonian operator representing the unitary part of the dynamics and the noise operators appearing in the quantum Master equation, and does not require any finite-time integration of the dynamics. In particular these results allow us to understand when application of quantum error correction protocols in order to recover the Heisenberg scaling in quantum metrology is not possible. Additionally, we provide methods to obtain quantitative bounds on achievable precision in the most general adaptive quantum metrological models. Finally, we apply the newly developed tools to prove fundamental bounds in atomic interferometry with many-body effects such as many body losses as well as models involving many-body terms in the Hamiltonian part of the dynamics commonly referred to as non-linear quantum metrology.

Paper Details

Date Published: 19 October 2017
Proc. SPIE 10442, Quantum Information Science and Technology III, 104420I (19 October 2017); doi: 10.1117/12.2279695
Show Author Affiliations
Rafal Demkowicz-Dobrzanski, Univ. of Warsaw (Poland)
Pavel Sekatski, Univ. of Innsbruck (Austria)
Jan Czajkowski, Univ. van Amsterdam (Netherlands)

Published in SPIE Proceedings Vol. 10442:
Quantum Information Science and Technology III
Mark T. Gruneisen; Miloslav Dusek; John G. Rarity, Editor(s)

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