Fast multiplexed superconducting qubit readout with intrinsic Purcell filtering

• URL: http://arxiv.org/abs/2409.04967v2
• Date: Wed, 11 Sep 2024 09:36:43 GMT
• Title: Fast multiplexed superconducting qubit readout with intrinsic Purcell filtering
• Authors: Peter A. Spring, Luka Milanovic, Yoshiki Sunada, Shiyu Wang, Arjan F. van Loo, Shuhei Tamate, Yasunobu Nakamura,
• Abstract summary: In superconducting quantum circuits, fast qubit measurement has been achieved using a dispersively coupled resonator with a large external linewidth. This necessitates the use of a Purcell filter that protects the qubit from relaxation through the readout channel. Here we show that a readout resonator and filter resonator, coupled to each other both capacitively and inductively, can produce a compact notch-filter circuit.
• Score: 2.0628957149004683
• License: http://creativecommons.org/licenses/by-nc-sa/4.0/
• Abstract: Fast and accurate qubit measurement remains a critical challenge on the path to fault-tolerant quantum computing. In superconducting quantum circuits, fast qubit measurement has been achieved using a dispersively coupled resonator with a large external linewidth. This necessitates the use of a Purcell filter that protects the qubit from relaxation through the readout channel. Here we show that a readout resonator and filter resonator, coupled to each other both capacitively and inductively, can produce a compact notch-filter circuit that effectively eliminates the Purcell decay channel through destructive interference. By utilizing linewidths as large as 42 MHz, we perform 56-ns simultaneous readout of four qubits and benchmark an average assignment fidelity of 99.77%, with the highest qubit assignment fidelity exceeding 99.9%. These results demonstrate a significant advancement in speed and fidelity for multiplexed superconducting qubit readout.

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