Fast multiplexed superconducting qubit readout with intrinsic Purcell filtering
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arXiv
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| Main Authors: | , , , , , , |
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| Format: | Preprint |
| Published: |
2024
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| _version_ | 1866916830520541184 |
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| author | Spring, Peter A. Milanovic, Luka Sunada, Yoshiki Wang, Shiyu van Loo, Arjan F. Tamate, Shuhei Nakamura, Yasunobu |
| author_facet | Spring, Peter A. Milanovic, Luka Sunada, Yoshiki Wang, Shiyu van Loo, Arjan F. Tamate, Shuhei Nakamura, Yasunobu |
| contents | 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. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2409_04967 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Fast multiplexed superconducting qubit readout with intrinsic Purcell filtering Spring, Peter A. Milanovic, Luka Sunada, Yoshiki Wang, Shiyu van Loo, Arjan F. Tamate, Shuhei Nakamura, Yasunobu Quantum Physics 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. |
| title | Fast multiplexed superconducting qubit readout with intrinsic Purcell filtering |
| topic | Quantum Physics |
| url | https://arxiv.org/abs/2409.04967 |