Comet Calendar Event Details

Physics Colloquium: Amplifying microwave signals with noise set by Heisenbergs uncertainity principle
Wednesday, Sep. 25, 2019
4 p.m. - 5 p.m. Location: SLC 1.102

Dr. Shyam Shankar (UT Austin)

Quantum mechanics puts a limit on how small the noise added by an amplifier can be. Limiting this extra noise, which causes unavoidable signal degradation, is an essential requirement for the measurement of weak electromagnetic signals in various areas of science and engineering. In particular, a nearly-quantum-limited microwave amplifier is a key tool in the field of superconducting quantum circuits, one of the leading platforms for quantum information processing. In this talk, I will describe how we built a microwave measurement system using Josephson-junction-based parametric amplifiers that adds only the minimum amount of noise required by quantum mechanics. I will then survey experiments made possible by these amplifiers, such as the high-fidelity readout of the state of a superconducting qubit and the stabilization of quantum states by feedback and error correction. Finally, I will discuss how we have improved the performance of these amplifiers to achieve greater power handling and information throughput, necessary for realizing large-scale quantum information processors.

Contact Info:
Michael Kesden, 972-883-3598
Questions? Email me.

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