Quasiparticles in Superconducting Qubits: History and Recent Developments | Gianluigi Catelani

Speaker: Gianluigi Catelani
Host: Zlatko Minev, Ph.D.

Title: Quasiparticles in Superconducting Qubits: History and Recent Developments

Papers:

Abstract: Over the years, the coherence of superconducting qubits has been significantly improved, but further improvements would help reducing the overhead necessary for implementing quantum error correction. Therefore, despite the past successes, it is still necessary to investigate decoherence processes and to devise ways to suppress them. Since the early years of superconducting qubits, quasiparticles have been recognized as a possible source of decoherence. I will briefly review the history of quasiparticle effects in qubits, both in theory and experiments. Interestingly, the qubit sensitivity to quasiparticles makes it possible to measure their dynamics. I will discuss ways to control this dynamics, so that the detrimental effects of quasiparticles can be minimized. Finally, I will discuss some recent findings hinting at possible origins of quasiparticles.
Gianluigi Catelani is a research scientist at the Juelich Research Center (Germany). He received his PhD (2005) in Physics from Columbia University in New York. His background is in theoretical mesoscopic physics and low-temperature superconductivity. In 2009, while at Yale University, he started working in close collaboration with experimental groups on modeling the physics of superconducting devices, qubits in particular. He has continued this line of research since moving to Germany in 2012.

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The Quantum Computing Seminar Series is a deep dive into various academic and research topics within the quantum community. It will feature community members and leaders every Friday, 12 PM EDT.

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