Long-distance transmon coupler with CZ gate fidelity above $99.8\%$
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| Format: | Preprint |
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2022
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| author | Marxer, Fabian Vepsäläinen, Antti Jolin, Shan W. Tuorila, Jani Landra, Alessandro Ockeloen-Korppi, Caspar Liu, Wei Ahonen, Olli Auer, Adrian Belzane, Lucien Bergholm, Ville Chan, Chun Fai Chan, Kok Wai Hiltunen, Tuukka Hotari, Juho Hyyppä, Eric Ikonen, Joni Janzso, David Koistinen, Miikka Kotilahti, Janne Li, Tianyi Luus, Jyrgen Papic, Miha Partanen, Matti Räbinä, Jukka Rosti, Jari Savytskyi, Mykhailo Seppälä, Marko Sevriuk, Vasilii Takala, Eelis Tarasinski, Brian Thapa, Manish J. Tosto, Francesca Vorobeva, Natalia Yu, Liuqi Tan, Kuan Yen Hassel, Juha Möttönen, Mikko Heinsoo, Johannes |
| author_facet | Marxer, Fabian Vepsäläinen, Antti Jolin, Shan W. Tuorila, Jani Landra, Alessandro Ockeloen-Korppi, Caspar Liu, Wei Ahonen, Olli Auer, Adrian Belzane, Lucien Bergholm, Ville Chan, Chun Fai Chan, Kok Wai Hiltunen, Tuukka Hotari, Juho Hyyppä, Eric Ikonen, Joni Janzso, David Koistinen, Miikka Kotilahti, Janne Li, Tianyi Luus, Jyrgen Papic, Miha Partanen, Matti Räbinä, Jukka Rosti, Jari Savytskyi, Mykhailo Seppälä, Marko Sevriuk, Vasilii Takala, Eelis Tarasinski, Brian Thapa, Manish J. Tosto, Francesca Vorobeva, Natalia Yu, Liuqi Tan, Kuan Yen Hassel, Juha Möttönen, Mikko Heinsoo, Johannes |
| contents | Tunable coupling of superconducting qubits has been widely studied due to its importance for isolated gate operations in scalable quantum processor architectures. Here, we demonstrate a tunable qubit-qubit coupler based on a floating transmon device which allows us to place qubits at least 2 mm apart from each other while maintaining over 50 MHz coupling between the coupler and the qubits. In the introduced tunable-coupler design, both the qubit-qubit and the qubit-coupler couplings are mediated by two waveguides instead of relying on direct capacitive couplings between the components, reducing the impact of the qubit-qubit distance on the couplings. This leaves space for each qubit to have an individual readout resonator and a Purcell filter needed for fast high-fidelity readout. In addition, the large qubit-qubit distance reduces unwanted non-nearest neighbor coupling and allows multiple control lines to cross over the structure with minimal crosstalk. Using the proposed flexible and scalable architecture, we demonstrate a controlled-$Z$ gate with $(99.81 \pm 0.02)\%$ fidelity. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2208_09460 |
| institution | arXiv |
| publishDate | 2022 |
| record_format | arxiv |
| spellingShingle | Long-distance transmon coupler with CZ gate fidelity above $99.8\%$ Marxer, Fabian Vepsäläinen, Antti Jolin, Shan W. Tuorila, Jani Landra, Alessandro Ockeloen-Korppi, Caspar Liu, Wei Ahonen, Olli Auer, Adrian Belzane, Lucien Bergholm, Ville Chan, Chun Fai Chan, Kok Wai Hiltunen, Tuukka Hotari, Juho Hyyppä, Eric Ikonen, Joni Janzso, David Koistinen, Miikka Kotilahti, Janne Li, Tianyi Luus, Jyrgen Papic, Miha Partanen, Matti Räbinä, Jukka Rosti, Jari Savytskyi, Mykhailo Seppälä, Marko Sevriuk, Vasilii Takala, Eelis Tarasinski, Brian Thapa, Manish J. Tosto, Francesca Vorobeva, Natalia Yu, Liuqi Tan, Kuan Yen Hassel, Juha Möttönen, Mikko Heinsoo, Johannes Quantum Physics Tunable coupling of superconducting qubits has been widely studied due to its importance for isolated gate operations in scalable quantum processor architectures. Here, we demonstrate a tunable qubit-qubit coupler based on a floating transmon device which allows us to place qubits at least 2 mm apart from each other while maintaining over 50 MHz coupling between the coupler and the qubits. In the introduced tunable-coupler design, both the qubit-qubit and the qubit-coupler couplings are mediated by two waveguides instead of relying on direct capacitive couplings between the components, reducing the impact of the qubit-qubit distance on the couplings. This leaves space for each qubit to have an individual readout resonator and a Purcell filter needed for fast high-fidelity readout. In addition, the large qubit-qubit distance reduces unwanted non-nearest neighbor coupling and allows multiple control lines to cross over the structure with minimal crosstalk. Using the proposed flexible and scalable architecture, we demonstrate a controlled-$Z$ gate with $(99.81 \pm 0.02)\%$ fidelity. |
| title | Long-distance transmon coupler with CZ gate fidelity above $99.8\%$ |
| topic | Quantum Physics |
| url | https://arxiv.org/abs/2208.09460 |