Complete hyperentangled Greenberger-Horne-Zeilinger state analysis for polarization and time-bin hyperentanglement

TL;DR

This paper proposes an efficient, two-step scheme for complete analysis of hyperentangled GHZ states in polarization and time-bin degrees of freedom, enhancing quantum communication capabilities.

Contribution

It introduces a novel method combining CPF gates and self-assisted mechanisms for nondestructive, complete hyperentangled GHZ state analysis in multiple photons.

Findings

Complete polarization GHZ state analysis achieved

Time-bin GHZ state analyzed using preserved polarization entanglement

Scheme generalizable to N-photon hyperentangled GHZ states

Abstract

We present an efficient scheme for the complete analysis of hyperentangled Greenberger-Horne-Zeilinger (GHZ) state in polarization and time-bin degrees of freedom with two steps. First, the polarization GHZ state is distinguished completely and nondestructively, resorting to the controlled phase flip (CPF) gate constructed by the cavity-assisted interaction. Subsequently, the time-bin GHZ state is analyzed by using the preserved polarization entanglement. With the help of CPF gate and self-assisted mechanism, our scheme can be directly generalized to the complete N-photon hyperentangled GHZ state analysis, and it may have potential applications in the hyperentanglement-based quantum communication.