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25 April 2024

» arxiv » 1006.5084

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Quantum process tomography of two-qubit controlled-Z and controlled-NOT gates using superconducting phase qubits
T. Yamamoto ; M. Neeley ; E. Lucero ; R. C. Bialczak ; J. Kelly ; M. Lenander ; Matteo Mariantoni ; A. D. O'Connell ; D. Sank ; H. Wang ; M. Weides ; J. Wenner ; Y. Yin ; A. N. Cleland ; John M. Martinis ;
Date:	26 Jun 2010
Abstract:	We experimentally demonstrate quantum process tomography of controlled-Z and controlled-NOT gates using capacitively-coupled superconducting phase qubits. These gates are realized by using the $\|2 angle$ state of the phase qubit. We obtain a process fidelity of 0.70 for the controlled-phase and 0.56 for the controlled-NOT gate, with the loss of fidelity mostly due to single-qubit decoherence. The controlled-Z gate is also used to demonstrate a two-qubit Deutsch-Jozsa algorithm with a single function query.
Source:	arXiv, 1006.5084
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