6533b85ffe1ef96bd12c2560

RESEARCH PRODUCT

Recovering entanglement by local operations

Giuliano BenentiGiuliano BenentiGiuseppe FalciR. Lo FrancoElisabetta PaladinoAntonio D'arrigo

subject

Quantum information; Entanglement; Decoherence; Open quantum systemsQuantum PhysicsQuantum informationComputer scienceCondensed Matter - SuperconductivityQuantum information; Entanglement; Open quantum systemsGeneral Physics and AstronomyFOS: Physical sciencesQuantum entanglementQuantum PhysicsDecoherenceAction (physics)Settore FIS/03 - Fisica Della MateriaOpen quantum systemsSuperconductivity (cond-mat.supr-con)EntanglementNoiseQubitBipartite graphStatistical physicsQuantum Physics (quant-ph)

description

We investigate the phenomenon of bipartite entanglement revivals under purely local operations in systems subject to local and independent classical noise sources. We explain this apparent paradox in the physical ensemble description of the system state by introducing the concept of "hidden" entanglement, which indicates the amount of entanglement that cannot be exploited due to the lack of classical information on the system. For this reason this part of entanglement can be recovered without the action of non-local operations or back-transfer process. For two noninteracting qubits under a low-frequency stochastic noise, we show that entanglement can be recovered by local pulses only. We also discuss how hidden entanglement may provide new insights about entanglement revivals in non-Markovian dynamics.

yearjournalcountryeditionlanguage
2012-07-13
10.1016/j.aop.2014.07.021http://hdl.handle.net/20.500.11769/15350