Entanglement and communication-reducing properties of noisy N-qubit states

Autor(en)

Wieslaw Laskowski, Tomasz Paterek, Caslav Brukner, Marek Zukowski

Abstrakt

We consider properties of states of many qubits, which arise after sending certain entangled states via various noisy channels (white noise, colored noise, local depolarization, dephasing, and amplitude damping). Entanglement of these states and their ability to violate certain classes of Bell inequalities are studied. States which violate them allow a higher than classical efficiency in solving related distributed computational tasks with constrained communication. This is a direct property of such states-not requiring their further modification via stochastic local operations and classical communication such as entanglement purification or distillation procedures. We identify families of multiparticle states which are entangled but nevertheless allow the local realistic description of specific Bell experiments. For some of them, the "gap" between the critical values for entanglement and violation of Bell inequality remains finite even in the limit of infinitely many qubits.

Organisation(en)

Quantenoptik, Quantennanophysik und Quanteninformation

Externe Organisation(en)

University of Gdańsk, Österreichische Akademie der Wissenschaften (ÖAW)

Journal

Physical Review A

Band

81

Anzahl der Seiten

10

ISSN

1050-2947

DOI

https://doi.org/10.1103/PhysRevA.81.042101

Publikationsdatum

2010

Peer-reviewed

Ja

ÖFOS 2012

103025 Quantenmechanik

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/ae6ca590-79e7-4d56-bbcd-67a95e430e4a