Experimental Determination of Entanglement for Arbitrary Pure States

TL;DR

This paper introduces an experimental method to measure entanglement in arbitrary pure states using local observables, eliminating the need for multiple copies or twin states, thus simplifying the process for multipartite systems.

Contribution

It provides a new approach to determine entanglement in multipartite pure states through local measurements on a single copy, avoiding complex state preparations.

Findings

Efficient measurement of concurrence using local observables.

Applicable to arbitrary multipartite pure states.

Reduces experimental complexity by avoiding twin state preparation.

Abstract

We present a way of experimentally determining the concurrence in terms of the expectation values of local observables for arbitrary multipartite pure states. In stead of the joint measurements on two copies of a state in the experiment for two-qubit systems [S. P. Walborn et al. Nature (London)440, 20(2006)], we only need one copy of the state in every measurement for any arbitrary dimensional multipartite systems, avoiding the preparation of twin states or the imperfect copy of the state.