"Quantum Thursdays - Controlling Surface Oxide of Superconducting Quantum Material"

Presented by Chenyu Zhou, Brookhaven National Lab

Thursday, April 6, 2023, 12:00 pm — Videoconference / Virtual Event (see link below)

Recent decades have witnessed rapid development of quantum information science driven by the advances of superconducting quantum circuits (SQC). The core element in SQC is superconducting qubit, where the physics of light-matter interaction is realized. So far, a variety of superconducting qubit has been designed, among which transmon, composed of Josephson Junction shunted by a large capacitor, is one of the most promising platforms since its invention in 2007 because of greatly reduced sensitivity to charge noise. In recent a couple of years, it has been shown that tantalum is a good candidate material, in place of conventional aluminum and niobium, that can improve the coherence time of transmon qubit. However, the oxidation of tantalum surface is inevitable instantly upon exposure to the atmosphere. Consequently, various defects such as two-level system (TLS) would reside at the insulating surface oxide layer, which leads to dielectric loss and thus decreases qubit coherence time. This talk will focus on the novel methods of controlling surface oxide of superconducting tantalum film.

Join Videoconference

18430  |  INT/EXT  |  Events Calendar


Not all computers/devices will add this event to your calendar automatically.

A calendar event file named "calendar.ics" will be placed in your downloads location. Depending on how your device/computer is configured, you may have to locate this file and double click on it to add the event to your calendar.

Event dates, times, and locations are subject to change. Event details will not be updated automatically once you add this event to your own calendar. Check the Lab's Events Calendar to ensure that you have the latest event information.