Quantum enhanced measurements without entanglement

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


Publication details

JournalReviews of Modern Physics
DateAccepted/In press - 8 Mar 2018
DatePublished (current) - 5 Sep 2018
Original languageEnglish


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.

Bibliographical note

44 pages, including 7 pages of references
© 2018 American Physical Society. This is an author-produced version of the published paper. Uploaded in accordance with the publisher’s self-archiving policy. Further copying may not be permitted; contact the publisher for details

    Research areas

  • quant-ph, cond-mat.mes-hall, cond-mat.quant-gas, physics.optics

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