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Backaction-free measurement of quantum correlations via quantum time-domain interferometry

Salvatore Castrignano and Jörg Evers
Phys. Rev. A 101, 063842 – Published 29 June 2020

Abstract

Time-domain interferometry (TDI) is a method to probe space-time correlations among particles in condensed matter systems. Applying TDI to quantum systems raises the general question of whether two-time correlations can be reliably measured without an adverse impact of the measurement backaction on the dynamics of the system. Here, we show that a recently developed quantum version of TDI (QTDI) indeed can access the full quantum-mechanical two-time correlations without backaction. We further generalize QTDI to weak classical continuous-mode coherent input states, alleviating the need for single-photon input fields. Finally, we interpret our results by splitting the space-time correlations into two parts. While the first one is associated with projective measurements and thus insensitive to backaction, we identify the second contribution as arising from the coherence properties of the state of the probed target system, such that it is perturbed or even destroyed by measurements on the system.

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  • Received 26 March 2020
  • Accepted 28 May 2020

DOI:https://doi.org/10.1103/PhysRevA.101.063842

Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI. Open access publication funded by the Max Planck Society.

Published by the American Physical Society

Physics Subject Headings (PhySH)

General PhysicsCondensed Matter, Materials & Applied PhysicsAtomic, Molecular & Optical

Authors & Affiliations

Salvatore Castrignano and Jörg Evers

  • Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg, Germany

Article Text

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Issue

Vol. 101, Iss. 6 — June 2020

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