Skip to main content

Research Repository

Advanced Search

Experimental entanglement activation from discord in a programmable quantum measurement

Adesso, Gerardo; D’Ambrosio, Vincenzo; Nagali, Eleonora; Piani, Marco; Sciarrino, Fabio

Authors

Vincenzo D’Ambrosio

Eleonora Nagali

Marco Piani

Fabio Sciarrino



Abstract

In quantum mechanics, observing is not a passive act. Consider a system of two quantum particles A and B: if a measurement apparatus M is used to make an observation on B, the overall state of the system AB will typically be altered. When this happens, no matter which local measurement is performed, the two objects A and B are revealed to possess peculiar correlations known as quantum discord. Here, we demonstrate experimentally that the very act of local observation gives rise to an activation protocol which converts discord into distillable entanglement, a stronger and more useful form of quantum correlations, between the apparatus M and the composite system AB. We adopt a flexible two-photon setup to realize a three-qubit system (A, B, M) with programmable degrees of initial correlations, measurement interaction, and characterization processes. Our experiment demonstrates the fundamental mechanism underpinning the ubiquitous act of observing the quantum world and establishes the potential of discord in entanglement generation.

Citation

Adesso, G., D’Ambrosio, V., Nagali, E., Piani, M., & Sciarrino, F. (2014). Experimental entanglement activation from discord in a programmable quantum measurement. Physical Review Letters, 112(14), https://doi.org/10.1103/PhysRevLett.112.140501

Journal Article Type Article
Acceptance Date Feb 7, 2014
Publication Date Apr 7, 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 14
DOI https://doi.org/10.1103/PhysRevLett.112.140501
Public URL http://eprints.nottingham.ac.uk/id/eprint/47219
Publisher URL https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.112.140501
Copyright Statement Copyright information regarding this work can be found at the following address: http://eprints.nottingh.../end_user_agreement.pdf
Additional Information ©2014 American Physical Society

Files

14PRL_112_140501.pdf (1.2 Mb)
PDF

Copyright Statement
Copyright information regarding this work can be found at the following address: http://eprints.nottingham.ac.uk/end_user_agreement.pdf





You might also like



Downloadable Citations