Quantum-information processing by nuclear magnetic resonance: Experimental implementation of half-adder and subtractor operations using an oriented spin-7/2 system

作     者：K. V. R. M. Murali Neeraj Sinha T. S. Mahesh Malcolm H. Levitt K. V. Ramanathan Anil Kumar 

作者机构：Department of Physics Indian Institute of Science Bangalore 560012 India Department of Chemistry University of Southampton Southampton SO17 1BJ England Sophisticated Instruments Facility Indian Institute of Science Bangalore 560012 India 

出 版 物：《Physical Review A》 (Phys Rev A)

年 卷 期：2002年第66卷第2期

页      面：022313-022313页

核心收录：

学科分类：07[理学] 0702[理学-物理学] 

主　　题：.spin system quadrupolar Nuclear magnetic resonance Labeling Anil Kumar experimental implementation subtractor half-adder quantum-information processing three-qubit system 

摘      要：The advantages of using quantum systems for performing many computational tasks have already been established. Several quantum algorithms have been developed which exploit the inherent property of quantum systems such as superposition of states and entanglement for efficiently performing certain tasks. The experimental implementation has been achieved on many quantum systems, of which nuclear magnetic resonance has shown the largest progress in terms of number of qubits. This paper describes the use of a spin-7/2 as a three-qubit system and experimentally implements the half-adder and subtractor operations. The required qubits are realized by partially orienting 133Cs nuclei in a liquid-crystalline medium, yielding a quadrupolar split well-resolved septet. Another feature of this paper is the proposal that labeling of quantum states of system can be suitably chosen to increase the efficiency of a computational task.