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Fast preparation method of effective pure states for NMR‐quantum computer with controlled‐not gates
Author(s) -
Kawamura Minaru,
Sawae Ryuichi,
Kumaya Takashi,
Takarabe Kenichi,
Manmoto Yoshinori,
Sakata Toshio
Publication year - 2004
Publication title -
international journal of quantum chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.484
H-Index - 105
eISSN - 1097-461X
pISSN - 0020-7608
DOI - 10.1002/qua.20297
Subject(s) - qubit , quantum computer , quantum , quantum mechanics , state (computer science) , quantum gate , physics , computer science , algorithm
A fast method to prepare effective pure states for NMR‐quantum computer in homo‐nuclear spin system is proposed. The temporal averaging method has been introduced to prepare an effective pure state in NMR‐quantum computer, but the method requires many experiments, whose number increases exponentially with the number of quantum bits (qubits), and it seems that a huge number of logical gates are required. The proposed method avoids this problem by eliminating a part of elements in the density matrices. This method requires only one ancillary qubit and two different experiments; the steps have been confirmed to be proportional to the number of qubits up to four‐qubit. © 2004 Wiley Periodicals, Inc. Int J Quantum Chem, 2004