Work

Quantum entanglement in phase space

Year: 2026

Type: article

Abstract: While commonly used entanglement criteria for continuous variable systems are based on quadrature measurements, here we study entanglement detection from measurements of the Wigner function. These are routinely performed in platforms such as trapped ions and circuit QED, where homodyne measurements are difficult to be implemented. We provide complementary criteria which we show to be tight for a variety of experimentally relevant Gaussian and non-Gaussian states. Our results show novel approaches to detect entanglement in continuous variable systems and shed light on interesting connections between known criteria and the Wigner function.

Source: Quantum

DOI: 10.22331/q-2026-03-23-2040

Authors: Shuheng Liu, Jiajie Guo, Qiongyi He, Matteo Fadel

Institutions: Peking University, Collaborative Innovation Center of Quantum Matter, State Key Laboratory of Artificial Microstructure and Mesoscopic Physics, Shanxi University, ETH Zurich

Language: English

Topic: Quantum Information and Cryptography

Subfield: Artificial Intelligence

Field: Computer Science

Domain: Physical Sciences

Open Access status: gold

Estimated APC paid: $215