In recent experiment, CAS Key Lab of Quantum Information experimentally investigate the collapse and revival of entanglement of two photons with one of them passing through a birefringent non-Markovian environment, which is simulated by a special designed Fabry-Perot (FP) cavity followed by quartz plates. They observe the revival of entanglement after it suffers from sudden death. This achievement was published in Physical Review Letters. [Jin-Shi Xu, Chuan-Feng Li, Ming Gong, Xu-Bo Zou, Cheng-Hao Shi, Geng Chen, and Guang-Can Guo, Physical Review Letters 104, 100502 (2010)]
With the deepening of Quantum Information, transmission process of entangled state in the channel has attracted increasing interests. It relates to reconsidering some key problems from nonlocal view.
Previous research showed sudden death in entanglement state evolution in a noisy environment. If the noise channel has non-Markovian effects, entanglement can revival after sudden collapse. This has great significance to quantum storage.
CAS Key Lab of Quantum Information 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, they 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.