Nonclassical correlation in NMR quadrupolar systems

Journal Article · Tue Jun 15 00:00:00 EDT 2010 · Physical Review. A

DOI:https://doi.org/10.1103/PHYSREVA.81.062118· OSTI ID:21407900

Soares-Pinto, D O; Auccaise, R; Azevedo, E R. de; Bonagamba, T J ^[1]; Celeri, L C; Maziero, J; Serra, R M ^[2]; Fanchini, F F ^[3]

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1. Instituto de Fisica de Sao Carlos, Universidade de Sao Paulo, Post Office Box 369, 13560-970 Sao Carlos, Sao Paulo (Brazil)
2. Centro de Ciencias Naturais e Humanas, Universidade Federal do ABC, R. Santa Adelia 166, 09210-170 Santo Andre, Sao Paulo (Brazil)
3. Instituto de Fisica Gleb Wataghin, Universidade Estadual de Campinas, Post Office Box 6165, 13083-970 Campinas, Sao Paulo (Brazil)

The existence of quantum correlation (as revealed by quantum discord), other than entanglement and its role in quantum-information processing (QIP), is a current subject for discussion. In particular, it has been suggested that this nonclassical correlation may provide computational speedup for some quantum algorithms. In this regard, bulk nuclear magnetic resonance (NMR) has been successfully used as a test bench for many QIP implementations, although it has also been continuously criticized for not presenting entanglement in most of the systems used so far. In this paper, we report a theoretical and experimental study on the dynamics of quantum and classical correlations in an NMR quadrupolar system. We present a method for computing the correlations from experimental NMR deviation-density matrices and show that, given the action of the nuclear-spin environment, the relaxation produces a monotonic time decay in the correlations. Although the experimental realizations were performed in a specific quadrupolar system, the main results presented here can be applied to whichever system uses a deviation-density matrix formalism.

• OSTI ID: 21407900
• Journal Information: Physical Review. A, Vol. 81, Issue 6; Other Information: DOI: 10.1103/PhysRevA.81.062118; (c) 2010 The American Physical Society; ISSN 1050-2947
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALGORITHMS
CORRELATIONS
CURRENTS
DECAY
DENSITY MATRIX
NUCLEAR MAGNETIC RESONANCE
QUANTUM ENTANGLEMENT
QUANTUM INFORMATION
RELAXATION
SPIN
ANGULAR MOMENTUM
INFORMATION
MAGNETIC RESONANCE
MATHEMATICAL LOGIC
MATRICES
PARTICLE PROPERTIES
RESONANCE