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Driven-state relaxation of a coupled qubit-defect system in spin-locking measurements
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It is widely known that spin-locking noise-spectroscopy is a powerful technique for the characterization of low-frequency noise mechanisms in superconducting qubits. Here we show that the relaxation rate of the driven spin-locking state of a qubit can be significantly affected by the presence of an off-resonant high-frequency two-level-system defect. Thus, both low- and high-frequency defects should be taken into account in the interpretation of spin-locking measurements and other types of driven-state noise-spectroscopy.
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Fast single-qubit gates for continuous dynamically decoupled systems
Fast non-perturbative single-qubit gates for continuously driven (CDD) qubits are demonstrated on a transmon, with average Clifford fidelity 0.9947(1) and over tenfold coherence improvement.
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