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Events on Thursday, April 7th, 2022

R. G. Herb Condensed Matter Seminar
Encoded Silicon Qubits: A High-Performance & Scalable Platform for Quantum Computing
Time: 10:00 am
Place: 5310 Chamberlin Hall
Speaker: Dr. Nathan Holman
Abstract: For quantum computers to achieve their promise, regardless of the qubit technology, significant improvements to both performance and scale are required. Quantum-dot-based qubits in silicon have recently enjoyed dramatic advances in fabrication and control techniques. The “exchange-only” modality is of particular interest, as it avoids control elements that are difficult to scale such as microwave fields, photonics, or ferromagnetic gradients. In this control scheme, the entirety of quantum computation may be performed using only asynchronous, baseband voltage pulses on straightforwardly tiled arrays of quantum dots. The pulses control only a single physical mechanism, the exchange interaction, which exhibits low control crosstalk and exceptionally high on/off ratios. Exchange enables universal logic within a qubit encoding that is robust against certain correlated errors. These aspects collectively provide a compelling path toward fault-tolerance. HRL Laboratories has recently demonstrated universal quantum logic of encoded exchange-only Si spin qubits, including two-qubit gates performed on arrays of six quantum dots. In this talk, we will introduce the fabrication and operation principles of these encoded Si qubit devices, and we will show recent experimental results.
Host: Mark Eriksson
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Physics ∩ ML Seminar
RED Talk: Data Science is on its Feet, Now Where is it Going?
Time: 4:00 pm - 5:00 pm
Place: Virtual, please register at
Speaker: Kyle Cranmer, AmFam Data Science Institute
Abstract: Interested in learning about the intersection of computational methodologies and real world problems, and the future of data science? Join UW-Madison CDIS for a virtual RED Talk by Kyle Cranmer, incoming director of American Family Data Science Institute!
Host: CDIS
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