Physics Department Colloquia

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Events on Friday, March 15th, 2024

Using Dissipation to Preserve Superconducting Qubit Coherence
Time: 3:30 pm - 6:00 pm
Place: 2241 Chamberlin Hall
Speaker: Eli Levinson-Falk, USC
Abstract: Superconducting qubits are a leading quantum information technology, combining high coherence, strong addressability, and flexible engineering. However, they are still prone to decoherence due to dissipative couplings to an uncontrolled environment. However, we can use dissipative coupling to a controlled environment to counteract decoherence and preserve the desired behavior. I will discuss some of our results using this approach, and focus on our recent development of a "dissipator" device that creates on-demand loss. By targeting this dissipation at a cavity, we can rapidly remove photons that might cause dephasing in a qubit coupled to the cavity. This dissipation both damps and refrigerates the target cavity, allowing for long-lived qubit coherence even when the bath temperature is high. I will discuss how to use this approach in a variety of applications, including both operating large-scale quantum processors and studies of foundational quantum mechanics.
Host: Maxim Vavilov
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