An approach to constructing genuinely entangled subspaces of maximal dimension

TL;DR

This paper presents a new method for constructing genuinely entangled subspaces of maximal dimension, enhancing the understanding and application of entanglement in quantum information science.

Contribution

It introduces an approach to build maximal dimension GESs, improving upon previous methods that produced smaller subspaces, with examples and mathematical connections.

Findings

Constructed GESs of maximal dimension in small systems

Connected GES construction to matrix space and numerical range problems

Demonstrated the method with illustrative examples

Abstract

Genuinely entangled subspaces (GESs) are the class of completely entangled subspaces that contain only genuinely multiparty entangled states. They constitute a particularly useful notion in the theory of entanglement but also have found an application, for instance, in quantum error correction and cryptography. In a recent study (Demianowicz and Augusiak in Phys Rev A 98:012313, 2018), we have shown how GESs can be efficiently constructed in any multiparty scenario from the so-called unextendible product bases. The provided subspaces, however, are not of maximal allowable dimensions, and our aim here is to put forward an approach to building such. The method is illustrated with few examples in small systems. Connections with other mathematical problems, such as spaces of matrices of equal rank and the numerical range, are discussed.