Multiqubit W states lead to stronger nonclassicality than Greenberger-Horne-Zeilinger states

Journal Article · Mon Dec 01 00:00:00 EST 2003 · Physical Review. A

DOI:https://doi.org/10.1103/PhysRevA.68.062306· OSTI ID:20640457

Sen, Aditi; Sen, Ujjwal; Zukowski, Marek ^[1]; Wiesniak, Marcin ^[2]; Kaszlikowski, Dagomir ^[3]

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1. Instytut Fizyki Teoretycznej i Astrofizyki, Uniwersytet Gdanski, PL-80-952 Gdansk (Poland)
2. Wydzial Matematyki i Fizyki, Uniwersytet Gdanski, PL-80-952 Gdansk (Poland)
3. Department of Physics, National University of Singapore, Singapore 117542 (Singapore)

The N-qubit states of the W class, for N>10, lead to more robust (against noise admixture) violations of local realism, than the Greenberger-Horne-Zeilinger (GHZ) states. These violations are most pronounced for correlations for a pair of qubits, conditioned on specific measurement results for the remaining N-2 qubits. The considerations provide us with a qualitative difference between the W state and GHZ state in the situation when they are separately sent via depolarizing channels. For sufficiently high amount of noise in the depolarizing channel, the GHZ states cannot produce a distillable state between two qubits, whereas the W states can still produce a distillable state in a similar situation.

• OSTI ID: 20640457
• Journal Information: Physical Review. A, Vol. 68, Issue 6; Other Information: DOI: 10.1103/PhysRevA.68.062306; (c) 2003 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 1050-2947
• Country of Publication: United States
• Language: English

Related Subjects

74 ATOMIC AND MOLECULAR PHYSICS
CORRELATIONS
DEPOLARIZATION
ENERGY LEVELS
INFORMATION THEORY
NOISE
QUANTUM MECHANICS