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Related Experiment Video

Updated: May 9, 2026

Generation and Coherent Control of Pulsed Quantum Frequency Combs
06:42

Generation and Coherent Control of Pulsed Quantum Frequency Combs

Published on: June 8, 2018

Quantum discord cannot be shared.

Alexander Streltsov1, Wojciech H Zurek

  • 1Heinrich-Heine-Universität Düsseldorf, Institut für Theoretische Physik III, D-40225 Düsseldorf, Germany. streltsov@thphy.uni-duesseldorf.de

Physical Review Letters
|August 13, 2013
PubMed
Summary
This summary is machine-generated.

Niels Bohr's idea that measurement outcomes become classical when communicated classically is confirmed. Nonclassical measurement devices lead to information loss, quantified by quantum discord, even without entanglement.

Related Experiment Videos

Last Updated: May 9, 2026

Generation and Coherent Control of Pulsed Quantum Frequency Combs
06:42

Generation and Coherent Control of Pulsed Quantum Frequency Combs

Published on: June 8, 2018

Area of Science:

  • Quantum Information Theory
  • Foundations of Quantum Mechanics
  • Quantum Measurement Theory

Background:

  • Bohr's correspondence principle posits that classicality arises from communicable measurement outcomes.
  • Classical communication limits the perfect transfer of information from quantum systems.
  • Quantum information theory provides novel tools to analyze quantum measurement.

Purpose of the Study:

  • To revisit and validate Bohr's postulate using contemporary quantum information theory.
  • To quantify information loss in classical communication of quantum measurement results.
  • To explore the role of quantum discord in the classicality of measurement outcomes.

Main Methods:

  • Application of quantum information theory tools to analyze measurement processes.
  • Investigation of information transfer from nonclassical measurement apparatus states.
  • Mathematical formulation of information loss in classical communication channels.

Main Results:

  • Confirmation that nonclassical measurement states prevent perfect classical communication of results.
  • Identification of quantum discord as the measure of lost information.
  • Demonstration that information loss occurs even without system-apparatus entanglement.

Conclusions:

  • Bohr's postulate is rigorously confirmed by modern quantum information theory.
  • Quantum discord quantifies the information irrevocably lost during classical communication of nonclassical measurements.
  • The study generalizes Bohr's postulate, highlighting limitations of quantum communication in multi-recipient scenarios.