Physics – Quantum Physics
Scientific paper
2008-12-04
Advanced Science Letters 2, 448 (2009)
Physics
Quantum Physics
16 pages, 7 figures, to be published on Advanced Science Letters
Scientific paper
10.1166/asl.2009.1058
Different procedures have been developed in order to recover entanglement after propagation over a noisy channel. Besides a certain amount of noise, entanglement is completely lost and the channel is called entanglement breaking. Here we investigate both theoretically and experimentally an entanglement concentration protocol for a mixed three-qubit state outgoing from a strong linear coupling of two-qubit maximally entangled polarization state with another qubit in a completely mixed state. Thanks to such concentration procedure, the initial entanglement can be probabilistically recovered. Furthermore, we analyse the case of sequential linear couplings with many depolarized photons showing that thanks to the concentration a full recovering of entanglement is still possible.
Filip} Radim
Gavenda Miroslav
Martini Francesco de
Nagali Eleonora
Sciarrino Fabio
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