Designing control protocols to enhance the coherence of superconducting qubits
Speaker: Ziwen Huang, Northwestern University
Recent breakthroughs in quantum-information technology have placed us in the exciting era of Noisy-Intermediate-Scale-Quantum (NISQ) systems. Among various platforms designed for quantum computation, qubits based on superconducting circuits have especially drawn broad research interest due to their good controllability. Despite remarkable success over the past decade, the decoherence in these qubits originating from the noisy environment still poses a challenge for achieving full-fledged quantum error correction. In this talk, I will discuss our recent work on designing control protocols to mitigate the noise. I will first introduce our project on the high-fidelity control of a coherent and low-frequency fluxonium qubit , one member of the superconducting-qubit family. Using this type of qubit as an example, I will further describe our work on dynamical sweet spots [2,3], which are designed to protect superconducting qubits from ubiquitous and particularly harmful 1/f noise. Our results show that single- and two-qubit gates, as well as qubit readout, are fully compatible with this protection scheme. Such a scheme could be extended to an alternative architecture for noise-resilient quantum-information processing.
 Zhang et al., arXiv:2002.10653 (2020)
 Huang et al., arXiv:2004.12458 (2020)
 Mundada et al., Phys. Rev. Applied 14, 054033 (2020)
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Meeting link: https://uwaterloo.webex.com/uwaterloo/j.php?MTID=m447729c69fdd59c634aa8915fc74d12c
Meeting number: 180 934 6807
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