document: Quantum-information processing by nuclear magnetic resonance : Experimental implementation of half-adder and subtractor operations using an oriented spin-7 / 2 system 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 / sup 133/Cs 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
doc_bio_tags: O O O B I I O O O O O O B I O O O O O O O O O O O B I O O O B I O O O O O O B I O O O O O O O O O B I O O O O O O B O O O O O O O O O O O O O O B I O O O B I I O O O O O O O O O O B O O O O O O O O O O O O O O O O O O O O O B I O O O B O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O B I O O O O O O O O O O O O B I
extractive_keyphrases: nuclear magnetic resonance subtractor operations quantum systems computational tasks quantum algorithms entanglement qubits quantum states computational task
abstractive_keyphrases: quantum-information processing half-adder operations oriented spin-7/2 system state superposition three-qubit system /sup 133/cs nuclei liquid-crystalline medium quadrupolar split well-resolved septet /sup 133/cs