Quantum process tomography with an arbitrary number of ancillary qubits in nuclear magnetic resonance

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We propose quantum process tomography (QPT) using an arbitrary number of ancillary qubits as a compromise between the advantages of the original QPT and the QPT using ancilla not smaller than the system. For an n-qubit system with m(< n) qubit ancilla, the number of total qubits and the number of measurements are n + m and 2(2(n-m)), respectively, compared to n and 2(n) in the former QPT and 2n and 1 in the latter QPT. As an example, QPT using a two-qubit operation with one ancillary qubit in nuclear magnetic resonance is studied. The initial states and the pulse sequences to produce them from the thermal equilibrium state are presented.
Publisher
KOREAN PHYSICAL SOC
Issue Date
2005-10
Language
English
Article Type
Article
Keywords

MIXED STATES; SEPARABILITY

Citation

JOURNAL OF THE KOREAN PHYSICAL SOCIETY, v.47, pp.736 - 739

ISSN
0374-4884
URI
http://hdl.handle.net/10203/91659
Appears in Collection
PH-Journal Papers(저널논문)
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