Journal
JOURNAL OF OPTICS B-QUANTUM AND SEMICLASSICAL OPTICS
Volume 3, Issue 6, Pages 376-381Publisher
IOP PUBLISHING LTD
DOI: 10.1088/1464-4266/3/6/305
Keywords
state tomography; density matrix reconstruction; NMR quantum computing
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Reconstruction of density matrices is important in NMR quantum computing. An analysis is made for a 2-qubit system using the error matrix method. It is found that the state tomography method determines well the parameters that are necessary for reconstructing the density matrix in NMR quantum computations. Analysis is also made for a simplified state tomography procedure that uses fewer read-outs. The result of this analysis with the error matrix method demonstrates that a satisfactory accuracy in the density matrix reconstruction can be achieved even in a measurement with the number of read-outs being largely reduced.
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