Year: 2025
Type: article
Abstract: Multi-copy activation of genuine multipartite entanglement (GME) is a phenomenon whereby multiple copies of biseparable but fully inseparable states can exhibit GME. This was shown to be generically possible in finite dimensions. Here, we extend this analysis to infinite dimensions. We provide examples of GME-activatable non-Gaussian states. For Gaussian states, we apply a necessary biseparability criterion for the covariance matrix and show that it cannot detect GME activation. We further identify fully inseparable Gaussian states that satisfy the criterion but show that multiple and, in some cases, even single copies are GME. Thus, we show that the covariance-matrix biseparability criterion is not sufficient even for Gaussian states.
Source: Quantum
Institutions: TU Wien, Palacký University Olomouc
Language: English
Subfield: Artificial Intelligence
Field: Computer Science
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $215
Awards: Exploiting infinite dimensions for quantum information, Continuous-Variable Multi-User Quantum Key Distribution for 5G and distributed storage applications, Hybrid-dimensional quantum correlations, G434337789, G5324842966, QuantERA ERA-NET Cofund in Quantum Technologies, Entanglement-Based Certification of Quantum Technologies, QuantERA II ERA-NET Cofund in Quantum Technologies, G6213417093, G7002019391, G7290050789, G8653124682
OpenAlex ID: W4409282704