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A Psychophysics Paradigm for the Collection and Analysis of Similarity Judgments

A Psychophysics Paradigm for the Collection and Analysis of Similarity Judgments

Published on: March 1, 2022

Optimality of Gaussian discord.

Stefano Pirandola¹, Gaetana Spedalieri¹, Samuel L Braunstein¹

¹Computer Science, University of York, York YO10 5GH, United Kingdom.

Physical Review Letters

|October 18, 2014

Summary

This summary is machine-generated.

We show that Gaussian discord is optimal for quantifying quantum correlations in bipartite Gaussian states. This allows computations to be simplified using only local Gaussian measurements, a key finding for quantum information science.

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Area of Science:

Quantum Information Science
Quantum Optics
Quantum Correlations

Background:

Quantum discord quantifies quantum correlations in quantum states.
Bipartite Gaussian states are fundamental in quantum optics and information.
Calculating quantum discord can be computationally intensive.

Purpose of the Study:

To demonstrate the optimality of Gaussian discord for bipartite Gaussian states.
To simplify the computation of quantum discord using local Gaussian measurements.
To characterize quantum correlations in important bosonic states.

Main Methods:

Exploiting the solved conjecture on bosonic minimum output entropy.
Proving optimality for a large family of Gaussian states, including two-mode squeezed thermal states.
Analyzing Gaussian states as Choi matrices of Gaussian channels.

Main Results:

Gaussian discord is proven to be optimal for a broad class of Gaussian states.
Quantum discord computation for these states can be restricted to local Gaussian measurements.
Complete characterization of quantum correlations for key bosonic states is achieved.

Conclusions:

The study establishes a significant simplification for calculating quantum discord in important quantum systems.
Findings pave the way for more efficient analysis of quantum correlations in experimental settings.
This work advances the understanding of quantum correlations in quantum optics and information.