Quantum process tomography of two-qubit controlled-Z and controlled-NOT gates using superconducting phase qubits

Details Quantum process tomography of two-qubit controlled-Z and controlled-NOT gates using superconducting phase qubits Quantum process tomography of two-qubit controlled-Z and controlled-NOT gates using superconducting phase qubits

2010-06-25

arxiv.org/abs/1006.5084v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

10 pages, 8 figures, including supplementary information

Scientific paper

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 $|2\rangle$ 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.

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