Events on Monday, August 4th, 2025
- Thesis Defense
- Scaling Technologies for Si/SiGe Spin Qubits
- Time: 10:00 am - 12:00 pm
- Place: 5310 Chamberlin
- Speaker: Michael Wolfe, Physics PhD Graduate Student
- Abstract: In my talk, I will present several experiments that address scalability challenges ahead for Si/SiGe quantum processors. Silicon qubits are uniquely positioned among quantum computing platforms due to their exceptionally small feature sizes and compatibility with the mature semiconductor industry infrastructure. However, the path to large-scale quantum computation capable of transformative societal impact is fraught with challenges. Chief among these are achieving device uniformity, establishing scalable connectivity to control electronics, enabling rapid initialization compatible with error correction, and maintaining qubit control at elevated temperatures. This thesis first addresses device uniformity by demonstrating a novel technique to control density of charge traps in the Si/SiGe heterostructure. Next, connectivity is explored with an on-chip cryogenic multiplexer which exponentially reduces the number of chip-to-fridge readout connections. Finally, experiments a on Intel Tunnel falls device are presented: (1) a new technique to quickly initialize spin qubits out of a latched state, and (2) a novel readout method that opens the door for high-temperature control of Si/SiGe qubits. Put together, these advances move Si/SiGe quantum dot qubits closer towards large-scale quantum computation.
- Host: Mark Eriksson