Quantum Feedback in a Superconducting Qubit: Physics seminar

Lecture/Seminar - Natural Sciences | February 8 | 10:30-11:45 a.m. | Classroom Building, COB 267

Location:  5200 North Lake Rd, Merced, CA 95343

Speaker/Performer: Professor Irfan Siddiqi

Sponsor: Physics-Chemistry

Irfan Siddiqi, a professor from UC Berkeley, will discuss "Quantum Feedback in a Superconducting Qubit" in a seminar on the UC Merced campus.

Recent advances in superconducting circuits, such as the development of robust quantum-noise-limited microwave amplifiers and quantum bits with lifetimes in excess of 100, enable the use of feedback to actively suppress decoherence.

Siddiqi's experimental architecture is based on a superconducting quantum bit coupled to a readout cavity. By applying microwave pulses, he modifed the spectrum of quantum fluctuations experienced by the qubit to autonomously cool the system to any coherent superposition of ground and excited states.

He and his researchers also perform weak measurement of the qubit state to implement continuous quantum feedback. Using this technique to counteract measurement induced backaction, they demonstrate Rabi oscillations that persist indefinitely.

These experiments suggest the plausibility of high fidelity measurement as a means to generate entanglement and implement error correction.

Event Contact: Professor Jing Xu, jxu8@ucmerced.edu, 209-228-4058