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Events During the Week of April 21st through April 28th, 2024

Monday, April 22nd, 2024

No events scheduled

Tuesday, April 23rd, 2024

Nonlocal transport effects in electron bilayers
Time: 12:00 pm - 2:00 pm
Place: 5280 Chamberlin
Speaker: Dmitry Zverevich, Physics Graduate Student
Abstract: With the discoveries of novel materials, efforts are underway to create hybrid multilayers by stacking them together to form complex heterostructures and to explore new emergent fundamental physics governed by electron correlations. Experimental results on drag resistivity between quantum wires and double-layer graphene heterostructures triggered theoretical works, including new proposals for the mechanisms of this phenomenon. I am going to talk about the predictive theory of Coulomb drag and its relative phenomenon of near-field heat transfer in the context of correlated electron phases and investigate unexplored regimes of quantum transport in various mesoscale systems.
Host: Alex Levchenko
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Wednesday, April 24th, 2024

Scaling Technologies for Si/SiGe Quantum Dot Qubits
Time: 2:00 pm - 4:00 pm
Place: 5310 Chamberlin or
Speaker: Michael Wolfe, Physics Graduate Student
Abstract: In this talk, I will discuss several solutions to the scale-up problem for solid-state quantum computers. This work focuses on semiconductor quantum-dot qubits in Si/SiGe, which share material compatibility with the existing microprocessor industry. I will show how to leverage this compatibility through the fabrication of a classical on-chip multiplexer to reduce the number of wires needed to control an array of Si/SiGe quantum devices. I will demonstrate the power of the multiplexer by performing rapid device diagnostics across the device array, and discuss pathways to scale up a quantum processor by deploying this technology for multiplexed readout. Next, I will show how to control in-situ the threshold voltages of Si/SiGe devices using cryogenic illumination. This technique rearranges the trapped charge at the oxide-semiconductor interface, in turn improving the uniformity of the operating voltages of Si/SiGe devices which can greatly simplifying the operation of large arrays of quantum dot qubits.
Host: Mark Eriksson
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Thursday, April 25th, 2024

Progress towards cooling and imaging on an alkali atom forbidden transition
Time: 11:00 am - 1:00 pm
Place: Sterling Hall B343
Speaker: Jacob Scott, Physics PhD Graduate Student
Abstract: I present progress towards atomic manipulation on the 6S1/2 - 5D5/2 forbidden transition in Cs. I discuss a few intriguing features of this transition, including a very high pump-depump ratio, very low Doppler temperature, and an intermediate state that allows for background free imaging. I also discuss development of the experimental apparatus and preliminary results of the experiment.
Host: Mark Saffman
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Friday, April 26th, 2024

No events scheduled