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Improving quantum gate fidelities by using a qubit to measure microwave pulse distortions
Simon Gustavsson, Olger Zwier, Jonas Bylander +5
We present a new method for determining pulse imperfections and improving the single-gate fidelity in a superconducting qubit. By applying consecutive positive and negative pul…
Dynamical decoupling and dephasing in interacting two-level systems
Simon Gustavsson, Fei Yan, Jonas Bylander +4
We implement dynamical decoupling techniques to mitigate noise and enhance the lifetime of an entangled state that is formed in a superconducting flux qubit coupled to a microscopi…
Driven dynamics and rotary echo of a qubit tunably coupled to a harmonic oscillator
Simon Gustavsson, Jonas Bylander, Fei Yan +18
We have investigated the driven dynamics of a superconducting flux qubit that is tunably coupled to a microwave resonator. We find that the qubit experiences an oscillating field m…
Spectroscopy of low-frequency noise and its temperature dependence in a superconducting qubit
Fei Yan, Jonas Bylander, Simon Gustavsson +7
We report a direct measurement of the low-frequency noise spectrum in a superconducting flux qubit. Our method uses the noise sensitivity of a free-induction Ramsey interference ex…