Activation of genuine multipartite entanglement: Beyond the singlecopy paradigm of entanglement characterisation
Abstract
Entanglement shared among multiple parties presents complex challenges for the characterisation of different types of entanglement. One of the most fundamental insights is the fact that some mixed states can feature entanglement across every possible cut of a multipartite system yet can be produced via a mixture of states separable with respect to different partitions. To distinguish states that genuinely cannot be produced from mixing such partitionseparable states, the term genuine multipartite entanglement was coined. All these considerations originate in a paradigm where only a single copy of the state is distributed and locally acted upon. In contrast, advances in quantum technologies prompt the question of how this picture changes when multiple copies of the same state become locally accessible. Here we show that multiple copies unlock genuine multipartite entanglement from partially separable states, i.e., mixtures of the partitionseparable states, even from undistillable ensembles, and even more than two copies can be required to observe this effect. With these findings, we characterise the notion of genuine multipartite entanglement in the paradigm of multiple copies and conjecture a strict hierarchy of activatable states and an asymptotic collapse of the hierarchy.
 Publication:

Quantum
 Pub Date:
 April 2022
 DOI:
 10.22331/q20220425695
 arXiv:
 arXiv:2106.01372
 Bibcode:
 2022Quant...6..695Y
 Keywords:

 Quantum Physics
 EPrint:
 13 pages, 2 figures