Related Experiment Video
Updated: Jun 1, 2026

Measurement of Quantum Interference in a Silicon Ring Resonator Photon Source
Published on: April 4, 2017
Linking quantum discord to entanglement in a measurement
Alexander Streltsov1, Hermann Kampermann, Dagmar Bruss
1Heinrich-Heine-Universität Düsseldorf, Institut für Theoretische Physik III, Düsseldorf, Germany. streltsov@thphy.uni-duesseldorf.de
Abstract:
We show that a von Neumann measurement on a part of a composite quantum system unavoidably creates distillable entanglement between the measurement apparatus and the system if the state has nonzero quantum discord. The minimal distillable entanglement is equal to the one-way information deficit. The quantum discord is shown to be equal to the minimal partial distillable entanglement that is the part of entanglement which is lost, when we ignore the subsystem which is not measured. We then show that any entanglement measure corresponds to some measure of quantum correlations. This powerful correspondence also yields necessary properties for quantum correlations. We generalize the results to multipartite measurements on a part of the system and on the total system.
Related Concept Videos
The de Broglie Wavelength
The Uncertainty Principle
The Quantum-Mechanical Model of an Atom
The Entropy as a State Function
Quantum Numbers
Entropy
