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

Journal Article · Thu Apr 15 04:00:00 EDT 2010 · Physical Review. A

DOI:https://doi.org/10.1103/PHYSREVA.81.042101· OSTI ID:21408556

Laskowski, Wieslaw ^[1]; Paterek, Tomasz ^[2]; Brukner, Caslav ^[3]; Zukowski, Marek ^[1]

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1. Institute of Theoretical Physics and Astrophysics, University of Gdansk, PL-80-952 Gdansk (Poland)
2. Institute for Quantum Optics and Quantum Information, Austrian Academy of Sciences, A-1090 Vienna (Austria)
3. Faculty of Physics, University of Vienna, A-1090 Vienna (Austria)

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.

• OSTI ID: 21408556
• Journal Information: Physical Review. A, Journal Name: Physical Review. A Journal Issue: 4 Vol. 81; ISSN 1050-2947; ISSN PLRAAN
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
AMPLITUDES
BELL THEOREM
COMMUNICATIONS
DAMPING
DEPOLARIZATION
EFFICIENCY
INFORMATION
MODIFICATIONS
NOISE
PURIFICATION
QUANTUM ENTANGLEMENT
QUANTUM INFORMATION
QUBITS
STOCHASTIC PROCESSES