Information geometry and entanglement under phase-space deformation through nonsymplectic congruence transformation

TL;DR

This paper explores how phase-space deformations via nonsymplectic transformations can induce entanglement in bipartite Gaussian systems, linking geometric transformations to quantum entanglement and noncommutative phase-space effects.

Contribution

It demonstrates that nonsymplectic congruence transformations, like Bopp's shift, can generate entanglement in Gaussian states and provides a quantitative analysis of this effect.

Findings

Nonsymplectic transformations induce entanglement in Gaussian states.

Phase-space deformation parameters influence the separability of bipartite systems.

A trade-off exists between initial correlations and deformation parameters.

Abstract

The Fisher-Rao (FR) information matrix is a central object in multiparameter quantum estimation theory. The geometry of a quantum state can be envisaged through the Riemannian manifold generated by the FR-metric corresponding to the quantum state. Interestingly, any congruence transformation $GL(2n,\mathbb{R})$ in phase-space leaves the FR-distance for Gaussian states invariant. In the present paper, we investigate whether this isometry affects the entanglement in the bipartite system. It turns out that, even a simple choice of a congruence transformation, induces the entanglement in a bipartite Gaussian system. To make our study relevant to physical systems, we choose Bopp's shift in phase-space as an example of $GL(2n,\mathbb{R})$, so that the results can be interpreted in terms of noncommutative (NC) phase-space deformation. We explicitly provide a quantitative measure of the dependence of separability on NC parameters. General expressions for the metric structure are also provided. The crucial point in the present piece of study is the identification of the connection of phase-space deformation-induced entanglement through a general class of congruence transformation and the identification of a trade-off relationship between the initial correlations and deformation parameters.