Graduate Program Events

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Events During the Week of September 19th through September 26th, 2021

Monday, September 20th, 2021

No events scheduled

Tuesday, September 21st, 2021

Correlated Charge Noise and Relaxation Errors in Superconducting Qubits
Time: 2:00 pm
Place: Zoom:
Speaker: Chris Wilen, Physics PhD Graduate Student
Abstract: A crucial requirement to the surface code is that errors cannot be correlated. Here, we characterize a superconducting multiqubit circuit and find that charge fluctuations are highly correlated on a length scale over 600~μm; moreover, discrete charge jumps are accompanied by a strong transient suppression of qubit energy relaxation time across the millimeter-scale chip. The resulting correlated errors are explained in terms of the charging event and phonon-mediated quasiparticle poisoning associated with absorption of gamma rays and cosmic-ray muons in the qubit substrate. Robust quantum error correction will require the development of mitigation strategies to protect multiqubit arrays from correlated errors due to particle impacts.
Host: Robert McDermott, faculty advisor
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Wednesday, September 22nd, 2021

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Thursday, September 23rd, 2021

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Friday, September 24th, 2021

No events scheduled