Graduate Program Events

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Events During the Week of July 2nd through July 9th, 2023

Monday, July 3rd, 2023

No events scheduled

Tuesday, July 4th, 2023

Independence Day
Abstract: *Note: actual end time may vary.* University offices closed. URL:
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Wednesday, July 5th, 2023

No events scheduled

Thursday, July 6th, 2023

Preliminary Exam
Toward implementation of protected charge-parity qubits
Time: 11:00 am - 1:00 pm
Place: 5280 Chamberlin
Speaker: Abigail Shearrow, Department of Physics Graduate Student
Abstract: Topologically protected qubits are an area of growing interest and active research, with the potential for orders-of-magnitude improvements in coherence compared to conventional qubits. One such protected qubit is the charge-parity (C-parity) qubit, which consists of a pi-periodic Josephson element shunted by a large capacitance. Here, we implement imperfect pi-elements as "plaquettes" consisting of two arms in parallel, each arm incorporating a small-area Josephson junction in series with a large inductor. When the plaquette is biased at half a flux quantum, the first harmonic of the Josephson energy is suppressed and the second harmonic, which is proportional to cos(2φ), remains. While individual plaquettes are not protected, protection scales exponentially with the number of plaquettes concatenated in series. In this talk we describe the design, fabrication, and characterization of plaquette devices.
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Friday, July 7th, 2023

No events scheduled