Impossibility of Local State Transformation via Hypercontractivity

TL;DR

This paper investigates the limitations of transforming bipartite quantum states using local operations, establishing bounds based on hypercontractivity properties of associated super-operators, highlighting fundamental impossibilities.

Contribution

It introduces bounds on local state transformations using hypercontractivity, providing new theoretical insights into quantum state convertibility.

Findings

Bounds on state transformation possibilities using hypercontractivity

Hypercontractivity measures via super-operator and completely bounded norms

Impossibility results for certain local state transformations

Abstract

Local state transformation is the problem of transforming an arbitrary number of copies of a bipartite resource state to a bipartite target state under local operations. That is, given two bipartite states, is it possible to transform an arbitrary number of copies of one of them to one copy of the other state under local operations only? This problem is a hard one in general since we assume that the number of copies of the resource state is arbitrarily large. In this paper we prove some bounds on this problem using the hypercontractivity properties of some super-operators corresponding to bipartite states. We measure hypercontractivity in terms of both the usual super-operator norms as well as completely bounded norms.