Quantum discord is not extremalized by Gaussian states

Seungmin Lee; Changsuk Noh; Jiyong Park

doi:10.1007/s11128-025-04693-x

Quantum discord is not extremalized by Gaussian states

Seungmin Lee, Changsuk Noh, Jiyong Park

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

Abstract

Quantum discord is an important measure of quantum correlations that goes beyond the paradigm of quantum entanglement. However, calculating quantum discord involves optimization over measurements, which is computationally challenging and often infeasible. This raises the intriguing question of Gaussian extremality—whether the quantum discord of a reference Gaussian state can provide a meaningful bound to the quantum discord of the original state. In this paper, we investigate this question by comparing the Gaussian discord of a reference Gaussian state with the quantum discord.

Original language	English
Article number	80
Journal	Quantum Information Processing
Volume	24
Issue number	3
DOIs	https://doi.org/10.1007/s11128-025-04693-x
State	Published - Mar 2025

Keywords

Continuous variable quantum system
Gaussian extremality
Quantum discord

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abstract = "Quantum discord is an important measure of quantum correlations that goes beyond the paradigm of quantum entanglement. However, calculating quantum discord involves optimization over measurements, which is computationally challenging and often infeasible. This raises the intriguing question of Gaussian extremality—whether the quantum discord of a reference Gaussian state can provide a meaningful bound to the quantum discord of the original state. In this paper, we investigate this question by comparing the Gaussian discord of a reference Gaussian state with the quantum discord.",

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Quantum discord is not extremalized by Gaussian states

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Keywords

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