01.40.+n Entanglement as a resource for information processing

Bound Nonlocality and Activation


Nicolas Brunner, Daniel Cavalcanti, Alejo Salles, and Paul Skrzypczyk


Phys. Rev. Lett. 106, 020402 (2011)

We investigate nonlocality distillation using measures of nonlocality based on the Elitzur-Popescu-Rohrlich decomposition. For a certain number of copies of a given nonlocal box, we define two quantities of interest: (i) the nonlocal cost and (ii) the distillable nonlocality. We find that there exist boxes whose distillable nonlocality is strictly smaller than their nonlocal cost. Thus nonlocality displays a form of irreversibility which we term “bound nonlocality.” Finally, we show that nonlocal distillability can be activated.

Experimental demonstration of a hyper-entangled ten-qubit Schrödinger cat state


Wei-Bo Gao, et. al. Nature Physics March 2010. doi:10.1038/nphys1603

Coherent manipulation of a large number of qubits and the generation of entangled states between them has been an important goal and benchmark in quantum information science, leading to various applications such as measurement-based quantum computing and high-precision quantum metrology. However, the experimental preparation of multiparticle entanglement remains challenging. Using atoms, entangled states of up to eight qubits have been created, and up to six photons have been entangled.

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