Photon-Noise-Tolerant Dispersive Readout of a Superconducting Qubit Using a Nonlinear Purcell Filter
Residual noise photons in a readout resonator become a major source of dephasing for a superconducting qubit when the resonator is optimized for a fast, high-fidelity dispersive readout. Here, we propose and demonstrate a nonlinear Purcell filter that suppresses such an undesirable dephasing process...
| Main Authors: | , , , , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
American Physical Society
2024-01-01
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| Series: | PRX Quantum |
| Online Access: | http://doi.org/10.1103/PRXQuantum.5.010307 |
| _version_ | 1797351305870573568 |
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| author | Yoshiki Sunada Kenshi Yuki Zhiling Wang Takeaki Miyamura Jesper Ilves Kohei Matsuura Peter A. Spring Shuhei Tamate Shingo Kono Yasunobu Nakamura |
| author_facet | Yoshiki Sunada Kenshi Yuki Zhiling Wang Takeaki Miyamura Jesper Ilves Kohei Matsuura Peter A. Spring Shuhei Tamate Shingo Kono Yasunobu Nakamura |
| author_sort | Yoshiki Sunada |
| collection | DOAJ |
| description | Residual noise photons in a readout resonator become a major source of dephasing for a superconducting qubit when the resonator is optimized for a fast, high-fidelity dispersive readout. Here, we propose and demonstrate a nonlinear Purcell filter that suppresses such an undesirable dephasing process without sacrificing the readout performance. When a readout pulse is applied, the filter automatically reduces the effective linewidth of the readout resonator, increasing the sensitivity of the qubit to the input field. The noise tolerance of the device we have fabricated is shown to be enhanced by a factor of 3 relative to a device with a linear filter. The measurement rate is enhanced by another factor of 3 by utilizing the bifurcation of the nonlinear filter. A readout fidelity of 99.4% and a quantum nondemolition fidelity of 99.2% are achieved using a 40-ns readout pulse. The nonlinear Purcell filter will be an effective tool for realizing a fast, high-fidelity readout without compromising the coherence time of the qubit. |
| first_indexed | 2024-03-08T12:58:21Z |
| format | Article |
| id | doaj.art-966d949e233e470fb12e4b0848bb52e0 |
| institution | Directory Open Access Journal |
| issn | 2691-3399 |
| language | English |
| last_indexed | 2024-03-08T12:58:21Z |
| publishDate | 2024-01-01 |
| publisher | American Physical Society |
| record_format | Article |
| series | PRX Quantum |
| spelling | doaj.art-966d949e233e470fb12e4b0848bb52e02024-01-19T15:04:58ZengAmerican Physical SocietyPRX Quantum2691-33992024-01-015101030710.1103/PRXQuantum.5.010307Photon-Noise-Tolerant Dispersive Readout of a Superconducting Qubit Using a Nonlinear Purcell FilterYoshiki SunadaKenshi YukiZhiling WangTakeaki MiyamuraJesper IlvesKohei MatsuuraPeter A. SpringShuhei TamateShingo KonoYasunobu NakamuraResidual noise photons in a readout resonator become a major source of dephasing for a superconducting qubit when the resonator is optimized for a fast, high-fidelity dispersive readout. Here, we propose and demonstrate a nonlinear Purcell filter that suppresses such an undesirable dephasing process without sacrificing the readout performance. When a readout pulse is applied, the filter automatically reduces the effective linewidth of the readout resonator, increasing the sensitivity of the qubit to the input field. The noise tolerance of the device we have fabricated is shown to be enhanced by a factor of 3 relative to a device with a linear filter. The measurement rate is enhanced by another factor of 3 by utilizing the bifurcation of the nonlinear filter. A readout fidelity of 99.4% and a quantum nondemolition fidelity of 99.2% are achieved using a 40-ns readout pulse. The nonlinear Purcell filter will be an effective tool for realizing a fast, high-fidelity readout without compromising the coherence time of the qubit.http://doi.org/10.1103/PRXQuantum.5.010307 |
| spellingShingle | Yoshiki Sunada Kenshi Yuki Zhiling Wang Takeaki Miyamura Jesper Ilves Kohei Matsuura Peter A. Spring Shuhei Tamate Shingo Kono Yasunobu Nakamura Photon-Noise-Tolerant Dispersive Readout of a Superconducting Qubit Using a Nonlinear Purcell Filter PRX Quantum |
| title | Photon-Noise-Tolerant Dispersive Readout of a Superconducting Qubit Using a Nonlinear Purcell Filter |
| title_full | Photon-Noise-Tolerant Dispersive Readout of a Superconducting Qubit Using a Nonlinear Purcell Filter |
| title_fullStr | Photon-Noise-Tolerant Dispersive Readout of a Superconducting Qubit Using a Nonlinear Purcell Filter |
| title_full_unstemmed | Photon-Noise-Tolerant Dispersive Readout of a Superconducting Qubit Using a Nonlinear Purcell Filter |
| title_short | Photon-Noise-Tolerant Dispersive Readout of a Superconducting Qubit Using a Nonlinear Purcell Filter |
| title_sort | photon noise tolerant dispersive readout of a superconducting qubit using a nonlinear purcell filter |
| url | http://doi.org/10.1103/PRXQuantum.5.010307 |
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