Abstract
A controlled-NOT logic gate based on conditional spectroscopy has been demonstrated recently for a pair of superconducting flux qubits [Plantenberg et al. in Nature 447:836, 2007]. Here we study the fidelity of this type of gate applied to a phase qubit coupled to a resonator (or a pair of capacitively coupled phase qubits). Our results show that an intrinsic fidelity of more than 99% is achievable in 45 ns.
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Ghosh, J., Geller, M.R. Controlled-NOT logic gate for phase qubits based on conditional spectroscopy. Quantum Inf Process 11, 1349–1357 (2012). https://doi.org/10.1007/s11128-011-0274-6
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DOI: https://doi.org/10.1007/s11128-011-0274-6