Work

Quantum discord is not extremalized by Gaussian states

Year: 2025

Type: article

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.

Source: Quantum Information Processing

DOI: 10.1007/s11128-025-04693-x

Authors: Seungmin Lee, Changsuk Noh, Jiyong Park

Institutions: Kyungpook National University, Hanbat National University

Language: English

Topic: Quantum Information and Cryptography

Subfield: Artificial Intelligence

Field: Computer Science

Domain: Physical Sciences

Open Access status: hybrid

Estimated APC paid: $2,990

Funder: National Research Foundation of Korea