Ensemble quantum-information processing by NMR: implementation of gates and the creation of pseudopure states using dipolar coupled spins as qubits

Mahesh, T. S. ; Sinha, Neeraj ; Ramanathan, K. V. ; Anil Kumar, (2002) Ensemble quantum-information processing by NMR: implementation of gates and the creation of pseudopure states using dipolar coupled spins as qubits Physical Review A, 65 (2). 022312_1-022312_6. ISSN 1050-2947

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Official URL: http://pra.aps.org/abstract/PRA/v65/i2/e022312

Related URL: http://dx.doi.org/10.1103/PhysRevA.65.022312

Abstract

Quantum-information processing is carried out using dipolar coupled spins and high-resolution nuclear magnetic resonance (NMR). The systems chosen are the dipolar coupled methyl protons of CH3CN partially oriented in a liquid crystalline matrix yielding a two-qubit system and dipolar coupled 13C and methyl protons of 13CH3CN also partially oriented in the liquid crystalline matrix, yielding a three-qubit system. The dipolar coupled protons of oriented CH3 group are chemically and magnetically identical and their eigenstates can be divided into a set of quartet states (symmetric A) and a pair of doublet (E) states. We describe here a method for selectively retaining the magnetization of the symmetric states, yielding two and three qubit systems. We create pseudopure states using single-quantum-transition selective pulses and implement two- and three-qubit gates using one- and two-dimensional NMR.

Item Type:Article
Source:Copyright of this article belongs to American Physical Society.
ID Code:715
Deposited On:25 Sep 2010 10:30
Last Modified:14 Jun 2011 14:37

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