Experimental generation of genuine four-partite entangled states with total three-party correlation for continuous variables

TL;DR

This paper reports the experimental creation of a new type of four-partite continuous variable entangled state with unique three-party correlations, differing from known GHZ and cluster states, and suitable for quantum information applications.

Contribution

The authors experimentally generate a novel four-partite entangled state with three-party correlations, expanding the types of continuous variable entanglement beyond existing states.

Findings

Successfully prepared a new four-partite entangled state

Measured correlation variances satisfy inseparability criteria

State exhibits unique three-party quantum correlations

Abstract

We experimentally prepare a new type of continuous variable genuine four-partite entangled states, the quantum correlation property of which is different from that of the four-mode GHZ and cluster states, and which has not any qubit counterpart to be proposed at present. In the criterion inequalities for the full inseparability of the genuine four-partite entangled states, the amplitude and phase quadrature correlation variances totally consisting of three-party combination from the four entangled modes are involved. The measured correlation variances among the quadratures of the prepared entangled states satisfy the sufficient requirements for the full inseparability. The type of entangled states has especially potential application in quantum information with continuous quantum variables.