Broadband parametric amplification with impedance engineering: Beyond the gain-bandwidth product

By Tanay Roy, S. Kundu, M. Chand, A. Vadiraj, A. Ranadive, N. Nehra, M. Patankar, J. Aumentado, A. Clerk, R. Vijay. 2015

181 citations recorded by the source corpus.

We present an impedance engineered Josephson parametric amplifier capable of providing bandwidth beyond the traditional gain-bandwidth product. We achieve this by introducing a positive linear slope in the imaginary component of the input impedance seen by the Josephson oscillator using a $\lambda/2$ transformer. Our theoretical model predicts an extremely flat gain profile with a bandwidth enhancement proportional to the square root of amplitude gain. We experimentally demonstrate a nearly flat 20 dB gain over a 640 MHz band, along with a mean 1-dB compression point of -110 dBm and near quantum-limited noise. The results are in good agreement with our theoretical model.

Subfields: Artificial Intelligence, Atomic and Molecular Physics, and Optics, Electrical and Electronic Engineering

View Paper: https://www.semanticscholar.org/paper/e5deab36dcc9c0d9544edf09d0ad14f43a019574

How researchers see this paper

The researchers whose trusted networks rank it highest, strongest advocate first. Every researcher gets a different order.

In Artificial Intelligence

In Atomic and Molecular Physics, and Optics

In Electrical and Electronic Engineering

Citations in the corpus

Rapid High-fidelity Multiplexed Readout of Superconducting Qubits (2018, unknown): “[27] Tanay Roy, Suman Kundu, Madhavi Chand, A.”
Optimizing the Nonlinearity and Dissipation of a SNAIL Parametric Amplifier for Dynamic Range (2018, background): “More broadly, the optimizations performed in this work for higher dynamic range do not conflict with recent approaches for enhanced dynamic bandwidth via impedance engineering [18,31], nor with approaches for directional amplification [32–37].”
Circuit quantum electrodynamics (2020, methodology): “Impedance engineering can be used to improve these numbers further (Roy et al., 2015).”
Rapid High-Fidelity Single-Shot Dispersive Readout of Superconducting Qubits (2017, unknown): “[23] Tanay Roy, Suman Kundu, Madhavi Chand, A.”
Superconducting Parametric Amplifiers: The State of the Art in Josephson Parametric Amplifiers (2020, background): “[41] in the context of varactor-based circuits, and there have been recent efforts to place similar design reasoning in a modern JJ circuit context [34], [42], [43].”