Broadband Bandpass Purcell Filter for Circuit Quantum Electrodynamics

• URL: http://arxiv.org/abs/2306.06258v3
• Date: Tue, 18 Jul 2023 18:19:28 GMT
• Title: Broadband Bandpass Purcell Filter for Circuit Quantum Electrodynamics
• Authors: Haoxiong Yan and Xuntao Wu and Andrew Lingenfelter and Yash J. Joshi and Gustav Andersson and Christopher R. Conner and Ming-Han Chou and Joel Grebel and Jacob M. Miller and Rhys G. Povey and Hong Qiao and Aashish A. Clerk and Andrew N. Cleland
• Abstract summary: In circuit quantum electrodynamics (QED), qubits are typically measured using dispersively-coupled readout resonators. Inserting a Purcell filter counters this effect while maintaining high readout fidelity, but reduces measurement bandwidth and thus limits multiplexing readout capacity. We develop and implement a multi-stage bandpass Purcell filter that yields better qubit protection while simultaneously increasing measurement bandwidth and multiplexed capacity.
• Score: 5.250183242080687
• License: http://creativecommons.org/licenses/by-nc-nd/4.0/
• Abstract: In circuit quantum electrodynamics (QED), qubits are typically measured using dispersively-coupled readout resonators. Coupling between each readout resonator and its electrical environment however reduces the qubit lifetime via the Purcell effect. Inserting a Purcell filter counters this effect while maintaining high readout fidelity, but reduces measurement bandwidth and thus limits multiplexing readout capacity. In this letter, we develop and implement a multi-stage bandpass Purcell filter that yields better qubit protection while simultaneously increasing measurement bandwidth and multiplexed capacity. We report on the experimental performance of our transmission-line--based implementation of this approach, a flexible design that can easily be integrated with current scaled-up, long coherence time superconducting quantum processors.

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