Optimality of Gaussian Discord

Stefano Pirandola; Gae Spedalieri; Samuel Leon Braunstein; Nicolas J. Cerf; Seth Lloyd

doi:10.1103/PhysRevLett.113.140405

Optimality of Gaussian Discord

Stefano Pirandola, Gae Spedalieri, Samuel Leon Braunstein, Nicolas J. Cerf, Seth Lloyd

Computer Science

Research output: Contribution to journal › Article › peer-review

Abstract

In this Letter we exploit the recently solved conjecture on the bosonic minimum output entropy to show the optimality of Gaussian discord, so that the computation of quantum discord for bipartite Gaussian states can be restricted to local Gaussian measurements. We prove such optimality for a large family of Gaussian states, including all two-mode squeezed thermal states, which are the most typical Gaussian states realized in experiments. Our family also includes other types of Gaussian states and spans their entire set in a suitable limit where they become Choi matrices of Gaussian channels. As a result, we completely characterize the quantum correlations possessed by some of the most important bosonic states in quantum optics and quantum information

Original language	English
Article number	140405
Number of pages	5
Journal	Physical Review Letters
Volume	113
Issue number	14
DOIs	https://doi.org/10.1103/PhysRevLett.113.140405
Publication status	Published - 3 Oct 2014

Bibliographical note

ReVTEX. 4 pages + 4 pages (Supplemental Material). Comments are welcome

Keywords

quant-ph
cond-mat.stat-mech
math-ph
math.MP
physics.optics

Access to Document

10.1103/PhysRevLett.113.140405

http://arxiv.org/abs/1309.2215

Samuel Leon Braunstein
- sam.braunsteinyork.acuk
- Computer Science - Professor
Person: Academic

Quantum Discrimination for data retrieval (qDATA)
Pirandola, S.
EPSRC
23/04/14 → 21/07/16
Project: Research project (funded) › Research
Quantum probing of biological samples
Pirandola, S.
1/07/13 → 31/05/15
Project: Research project (funded) › Research
High Rate Coherent Quantum Channels
Braunstein, S. L. (Principal investigator) & Pirandola, S. (Co-investigator)
EPSRC
1/12/11 → 30/11/14
Project: Research project (funded) › Research

Cite this

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title = "Optimality of Gaussian Discord",

abstract = "In this Letter we exploit the recently solved conjecture on the bosonic minimum output entropy to show the optimality of Gaussian discord, so that the computation of quantum discord for bipartite Gaussian states can be restricted to local Gaussian measurements. We prove such optimality for a large family of Gaussian states, including all two-mode squeezed thermal states, which are the most typical Gaussian states realized in experiments. Our family also includes other types of Gaussian states and spans their entire set in a suitable limit where they become Choi matrices of Gaussian channels. As a result, we completely characterize the quantum correlations possessed by some of the most important bosonic states in quantum optics and quantum information",

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Optimality of Gaussian Discord

Abstract

Bibliographical note

Keywords

Access to Document

Profiles

Samuel Leon Braunstein

Projects

Quantum Discrimination for data retrieval (qDATA)

Quantum probing of biological samples

High Rate Coherent Quantum Channels

Cite this