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Related Experiment Video

Updated: Jun 8, 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

Gaussian quantum discord.

Paolo Giorda1, Matteo G A Paris

  • 1ISI Foundation, I-10133 Torino, Italy. giorda@isi.it

Physical Review Letters
|September 28, 2010
PubMed
Summary
This summary is machine-generated.

We extended quantum discord to continuous variable systems, finding it minimized by generalized measurements for squeezed-thermal states. This quantum information measure helps distinguish entangled states in noisy channels.

Related Experiment Videos

Last Updated: Jun 8, 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
  • Quantum Optics
  • Continuous Variable Systems

Background:

  • Quantum discord quantifies quantum correlations beyond entanglement.
  • Extending quantum discord to continuous variable (CV) systems is crucial for quantum information processing.
  • Gaussian states are fundamental in CV quantum information.

Purpose of the Study:

  • To extend the definition of quantum discord to continuous variable systems.
  • To evaluate Gaussian quantum discord for bipartite Gaussian states, particularly squeezed-thermal states.
  • To analyze the role of state parameters and noisy channels on quantum discord.

Main Methods:

  • Developing a framework for quantum discord in continuous variable systems.
  • Calculating Gaussian quantum discord for bipartite Gaussian states.
  • Maximizing extractable information over Gaussian measurements for squeezed-thermal states.

Main Results:

  • Gaussian quantum discord was explicitly calculated for squeezed-thermal states.
  • The minimum quantum discord was found to be achieved by generalized measurements, not projective ones.
  • Squeezed-thermal states exhibit non-zero Gaussian discord, indicating quantum correlations.
  • A threshold of C(ϱ) = 1 was identified: states below this can be separable or entangled, while states above are always entangled.

Conclusions:

  • Quantum discord is a valuable tool for characterizing quantum correlations in continuous variable systems.
  • Generalized measurements play a key role in minimizing quantum discord.
  • The study provides insights into the relationship between entanglement, separability, and quantum discord in noisy environments.