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

Castrignano, S., & Evers, J. (2020). Backaction-free measurement of quantum correlations via quantum time-domain interferometry. Physical Review A, 101(6): 063842.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-002D-BB5A-C Version Permalink: http://hdl.handle.net/21.11116/0000-0006-C356-D
Genre: Journal Article

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2003.11900.pdf (Preprint), 705KB
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https://doi.org/10.1103/PhysRevA.101.063842 (Supplementary material)
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 Creators:
Castrignano, Salvatore1, Author              
Evers, Jörg1, Author              
Affiliations:
1Division Prof. Dr. Christoph H. Keitel, MPI for Nuclear Physics, Max Planck Society, ou_904546              

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Free keywords: Quantum Physics, quant-ph
 MPINP: Research group J. Evers – Division C. H. Keitel
 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, whether two-time correlations can be reliably measured without adverse impact of the measurement backaction onto 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 to 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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 Dates: 2020-06-29
 Publication Status: Published online
 Pages: 13 pages, 2 figures
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: arXiv: 2003.11900
 Degree: -

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Title: Physical Review A
  Other : Physical Review A: Atomic, Molecular, and Optical Physics
  Other : Phys. Rev. A
Source Genre: Journal
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Publ. Info: New York, NY : American Physical Society
Pages: - Volume / Issue: 101 (6) Sequence Number: 063842 Start / End Page: - Identifier: ISSN: 1050-2947
CoNE: https://pure.mpg.de/cone/journals/resource/954925225012_2