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Quantum-enhanced measurements without entanglement

Braun, Daniel; Adesso, Gerardo; Benatti, Fabio; Floreanini, Roberto; Marzolino, Ugo; Mitchell, Morgan W.; Pirandola, Stefano

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Authors

Daniel Braun

Fabio Benatti

Roberto Floreanini

Ugo Marzolino

Morgan W. Mitchell

Stefano Pirandola



Abstract

Quantum-enhanced measurements exploit quantum mechanical effects for increasing the sensitivity of measurements of certain physical parameters and have great potential for both fundamental science and concrete applications. Most of the research has so far focused on using highly entangled states, which are, however, difficult to produce and to stabilize for a large number of constituents. In the following we review alternative mechanisms, notably the use of more general quantum correlations such as quantum discord, identical particles, or non-trivial Hamiltonians; the estimation of thermodynamical parameters or parameters characterizing non-equilibrium states; and the use of quantum phase transitions. We describe both theoretically achievable enhancements and enhanced sensitivities, not primarily based on entanglement, that have already been demonstrated experimentally, and indicate some possible future research directions.

Citation

Braun, D., Adesso, G., Benatti, F., Floreanini, R., Marzolino, U., Mitchell, M. W., & Pirandola, S. (2018). Quantum-enhanced measurements without entanglement. Reviews of Modern Physics, 90(3), Article 035006. https://doi.org/10.1103/revmodphys.90.035006

Journal Article Type Article
Acceptance Date Jul 5, 2018
Online Publication Date Sep 5, 2018
Publication Date Sep 5, 2018
Deposit Date Sep 6, 2018
Publicly Available Date Mar 29, 2024
Journal Reviews of Modern Physics
Print ISSN 0034-6861
Electronic ISSN 1539-0756
Publisher American Physical Society
Peer Reviewed Peer Reviewed
Volume 90
Issue 3
Article Number 035006
DOI https://doi.org/10.1103/revmodphys.90.035006
Public URL https://nottingham-repository.worktribe.com/output/1063778

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