Nonlocal entanglement concentration scheme for partially entangled multipartite systems with nonlinear optics

TL;DR

This paper introduces a nonlocal entanglement concentration method using cross-Kerr nonlinearities that efficiently reconstructs maximally entangled multipartite states from partially entangled states without needing detailed state information or advanced detectors.

Contribution

The scheme is novel in utilizing cross-Kerr nonlinearities for entanglement concentration, avoiding the need for precise state coefficients and sophisticated detectors, thus enhancing practicality and efficiency.

Findings

Higher efficiency and yield than linear optical schemes

Does not require knowledge of state coefficients

Feasible with current technology

Abstract

We present a nonlocal entanglement concentration scheme for reconstructing some maximally entangled multipartite states from partially entangled ones by exploiting cross-Kerr nonlinearities to distinguish the parity of two polarization photons. Compared with the entanglement concentration schemes based on two-particle collective unitary evolution, this scheme does not require the parties to know accurately information about the partially entangled states--i.e., their coefficients. Moreover, it does not require the parties to possess sophisticated single-photon detectors, which makes this protocol feasible with present techniques. By iteration of entanglement concentration processes, this scheme has a higher efficiency and yield than those with linear optical elements. All these advantages make this scheme more efficient and more convenient than others in practical applications.