Geometric descriptions of entangled states by auxiliaries varieties

TL;DR

This paper introduces a geometric framework using algebraic geometry to classify multipartite entangled states, providing new insights and an algorithm for identifying states within specific geometric subvarieties.

Contribution

It offers a novel geometric description of entangled states via algebraic varieties and extends existing classifications with new examples and an invariant-based algorithm.

Findings

Geometric classification of multipartite entanglement states.

Extension of known classifications to new quantum systems.

An algorithm to determine state subvarieties in Hilbert space.

Abstract

The aim of the paper is to propose geometric descriptions of multipartite entangled states using algebraic geometry. In the context of this paper, geometric means each stratum of the Hilbert space, corresponding to an entangled state, is an open subset of an algebraic variety built by classical geometric constructions (tangent lines, secant lines) from the set of separable states. In this setting we describe well-known classifications of multipartite entanglement such as $2\times 2\times(n+1)$, for $n\geq 1$, quantum systems and a new example with the $2\times 3\times 3$ quantum system. Our description completes the approach of Miyake and makes stronger connections with recent work of algebraic geometers. Moreover for the quantum systems detailed in this paper we propose an algorithm, based on the classical theory of invariants, to decide to which subvariety of the Hilbert space a given state belongs.