Work

Detecting strongly non-Gaussian entanglement

Year: 2026

Type: article

Abstract: Efficiently certifying non-Gaussian entanglement in continuous-variable quantum systems is a central challenge for advancing quantum information processing, photonic quantum computing, and metrology. Here, we put forward continuous-variable counterparts to the recently introduced entanglement criteria based on moments of the partially transposed state, together with simple readout schemes that require only a few replicas of the state, passive linear optics, and particle-number measurements. We develop a multicopy method that enables the detection of strongly non-Gaussian entanglement for various relevant state families overlooked by standard approaches, which include the entire class of NOON states. Further, it is robust against realistic experimental constraints (losses, noise, and finite statistics), which we demonstrate by extensive numerical simulations.

Source: Physical Review Research

DOI: 10.1103/297d-3tbj

Authors: Serge Deside, Tobias Haas, Nicolas J. Cerf

Institution: Université Libre de Bruxelles

Language: English

Topic: Quantum Information and Cryptography

Subfield: Artificial Intelligence

Field: Computer Science

Domain: Physical Sciences

Open Access status: gold

Estimated APC paid: $2,625

Funders: European Commission, Fonds De La Recherche Scientifique - FNRS, QuantERA, Fonds pour la Formation à la Recherche dans l’Industrie et dans l’Agriculture