Experimental Entanglement Collapse and Revival

Vladimir S. Malinovsky, Ignacio R. Solá

Vladimir S. Malinovsky

Jin‐Shi Xu, Chuan‐Feng Li, Ming Gong +4 more

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.

V.K. Nguyen

Shao-Hua Xiang, Bin Shao, Kehui Song +1 more

We investigate multipartite entanglement properties in a system of driven N quantum dots coupled to a single-mode cavity field by means of state preparation fidelity and multiqubit concurrence. It is shown that the quantum collapse–revival (CR) phenomenon of the fidelity can be generated periodically when the external field is applied, and multipartite system is always in the entangled state as soon as the fidelity exhibits the CR phenomenon. We also discuss the influence of the parameters of the exciton–photon system on the CR phenomenon of the fidelity.

Atle Svandal, J. P. Hansen

We study the long-time dynamics of two entangled ions coupled by a single vibrational mode and two lasers with different frequencies as proposed by M\o{}lmer and S\o{}rensen [Phys. Rev. Lett. 82, 1835 (1999)]. It is shown that the time development involves collapses and revivals well known from the dynamics of a single atom in a cavity or in a trap. The revival time is found to be insensitive to the details of the initial collective vibrational state. Therefore, revival and collapse phenomena are obtained for coherent, thermal as well as other vibrational states.