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Friday, May 13, 2022
12:15 PM - 1:15 PM
East Bridge 201 (Richard P. Feynman Lecture Hall)

IQIM Postdoctoral and Graduate Student Seminar

Encoded Silicon Qubits: A High-Performance & Scalable Platform for Quantum Computing
Matthew Borselli, Manager, Device Technologies Department, HRL Laboratories, LLC,

This week only - lunch from 11:30 to 12:15 outside Bridge. Talk begins at 12:15 pm

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 seminar, we will introduce the fabrication and operation principles of these encoded Si qubit devices, and we will show recent experimental results.

Attendees joining in person must have a valid Caltech UID. Please show your UID at the door [201 E. Bridge].

This seminar will be held in person only.

For more information, please contact Marcia Brown by phone at 626-395-4013 or by email at