Experimental demonstration of photonic entanglement collapse and revival

TL;DR

This paper experimentally demonstrates the collapse and revival of entanglement in photon states within a non-Markovian environment, showing entanglement can be revived after sudden death and verifying its quantum nature through Bell's inequality violation.

Contribution

It provides the first all-optical experimental demonstration of entanglement revival in a non-Markovian setting, highlighting the dynamic nature of quantum entanglement.

Findings

Entanglement can be revived after sudden death in a non-Markovian environment.

A maximally revived state violates Bell's inequality with 4.1 standard deviations.

The experiment offers new insights into entanglement dynamics and quantum information processing.

Abstract

We demonstrate the collapse and revival features of the entanglement dynamics of different polarization-entangled photon states in a non-Markovian environment. Using an all-optical experimental setup, we show that entanglement can be revived even after it suffers from sudden death. A maximally revived state is shown to violate a Bell's inequality with 4.1 standard deviations which verifies its quantum nature. The revival phenomenon observed in this experiment provides an intriguing perspective on entanglement dynamics.