Joseph F. Keithley Award For Advances in Measurement Science (2021): Quantum Metrology Using Superconducting Parametric Amplifiers
· Invited
Abstract
The superconducting Josephson tunnel junction is a unique circuit element, which behaves as a nonlinear inductance with vanishingly small dissipation when cooled to well below its critical temperature. When incorporated into a circuit topology where quantum bound states can be readily resolved and addressed, one obtains a quantum bit suitable for sensing, communication, and computation. In the opposite quasi-continuum limit, nonlinear oscillatory circuits can be constructed for three- and four-wave mixing with near-quantum-limited noise performance. Josephson junctions can be embedded within standing-wave cavities or traveling-wave architectures for enhanced interaction with an input microwave frequency signal, resulting in high-gain amplification. We describe the basic design principles of contemporary Josephson parametric amplifiers, discuss performance limits, and highlight quantum applications in state readout, real-time feedback, and weak measurement.
*This research was supported by the Laboratory for Physical Sciences and the Army Research Office.
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Presenters
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Irfan Siddiqi
- Lawrence Berkeley National Laboratory
- University of California, Berkeley
- Univ of California - Berkeley
- Univ of California – Berkeley
- Quantum Nanoelectronics Lab, UC Berkeley
- Physics, University of California, Berkeley
- Quantum Nanoelectronics Laboratory, Dept. of Physics, University of California, Berkeley