Davide Girolami
Quantum discord determines the interferometric power of quantum states
Girolami, Davide; Souza, Alexandre M.; Giovannetti, Vittorio; Tufarelli, Tommaso; Filgueiras, Jefferson G.; Sarthour, Roberto S.; Soares-Pinto, Diogo O.; Oliveira, Ivan S.; Adesso, Gerardo
Authors
Alexandre M. Souza
Vittorio Giovannetti
TOMMASO TUFARELLI TOMMASO.TUFARELLI@NOTTINGHAM.AC.UK
Assistant Professor
Jefferson G. Filgueiras
Roberto S. Sarthour
Diogo O. Soares-Pinto
Ivan S. Oliveira
Professor GERARDO ADESSO gerardo.adesso@nottingham.ac.uk
Professor of Mathematical Physics
Abstract
Quantum metrology exploits quantum mechanical laws to improve the precision in estimating technologically relevant parameters such as phase, frequency, or magnetic fields. Probe states are usually tailored to the particular dynamics whose parameters are being estimated. Here we consider a novel framework where quantum estimation is performed in an interferometric configuration, using bipartite probe states prepared when only the spectrum of the generating Hamiltonian is known. We introduce a figure of merit for the scheme, given by the worst-case precision over all suitable Hamiltonians, and prove that it amounts exactly to a computable measure of discord-type quantum correlations for the input probe. We complement our theoretical results with a metrology experiment, realized in a highly controllable room-temperature nuclear magnetic resonance setup, which provides a proof-of-concept demonstration for the usefulness of discord in sensing applications. Discordant probes are shown to guarantee a nonzero phase sensitivity for all the chosen generating Hamiltonians, while classically correlated probes are unable to accomplish the estimation in a worst-case setting. This work establishes a rigorous and direct operational interpretation for general quantum correlations, shedding light on their potential for quantum technology.
Citation
Girolami, D., Souza, A. M., Giovannetti, V., Tufarelli, T., Filgueiras, J. G., Sarthour, R. S., …Adesso, G. (2014). Quantum discord determines the interferometric power of quantum states. Physical Review Letters, 112(21), https://doi.org/10.1103/PhysRevLett.112.210401
Journal Article Type | Article |
---|---|
Acceptance Date | Mar 27, 2014 |
Publication Date | May 27, 2014 |
Deposit Date | Oct 12, 2017 |
Publicly Available Date | Oct 12, 2017 |
Journal | Physical Review Letters |
Print ISSN | 0031-9007 |
Electronic ISSN | 1079-7114 |
Publisher | American Physical Society |
Peer Reviewed | Peer Reviewed |
Volume | 112 |
Issue | 21 |
DOI | https://doi.org/10.1103/PhysRevLett.112.210401 |
Public URL | https://nottingham-repository.worktribe.com/output/728152 |
Publisher URL | https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.112.210401 |
Additional Information | ©2014 American Physical Society |
Files
14PRL_112_210401.pdf
(662 Kb)
PDF
Copyright Statement
Copyright information regarding this work can be found at the following address: http://eprints.nottingham.ac.uk/end_user_agreement.pdf
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