Long-Distance Transmon Coupler with cz -Gate Fidelity above 99.8 %

Fabian Marxer; Antti Vepsäläinen; Shan W. Jolin; Jani Tuorila; Alessandro Landra; Caspar Ockeloen-Korppi; Wei Liu; Olli Ahonen; Adrian Auer; Lucien Belzane; Ville Bergholm; Chun Fai Chan; Kok Wai Chan; Tuukka Hiltunen; Juho Hotari; Eric Hyyppä; Joni Ikonen; David Janzso; Miikka Koistinen; Janne Kotilahti; Tianyi Li; Jyrgen Luus; Miha Papic; Matti Partanen; Jukka Räbinä; Jari Rosti; Mykhailo Savytskyi; Marko Seppälä; Vasilii Sevriuk; Eelis Takala; Brian Tarasinski; Manish J. Thapa; Francesca Tosto; Natalia Vorobeva; Liuqi Yu; Kuan Yen Tan; Juha Hassel; Mikko Möttönen; Johannes Heinsoo

doi:10.1103/PRXQuantum.4.010314

Long-Distance Transmon Coupler with cz -Gate Fidelity above 99.8 %

Fabian Marxer, Antti Vepsäläinen, Shan W. Jolin, Jani Tuorila, Alessandro Landra, Caspar Ockeloen-Korppi, Wei Liu, Olli Ahonen, Adrian Auer, Lucien Belzane, Ville Bergholm, Chun Fai Chan, Kok Wai Chan, Tuukka Hiltunen, Juho Hotari, Eric Hyyppä, Joni Ikonen, David Janzso, Miikka Koistinen, Janne KotilahtiTianyi Li, Jyrgen Luus, Miha Papic, Matti Partanen, Jukka Räbinä, Jari Rosti, Mykhailo Savytskyi, Marko Seppälä, Vasilii Sevriuk, Eelis Takala, Brian Tarasinski, Manish J. Thapa, Francesca Tosto, Natalia Vorobeva, Liuqi Yu, Kuan Yen Tan, Juha Hassel, Mikko Möttönen, Johannes Heinsoo

BA62 Microelectronics and quantum technology

Research output: Contribution to journal › Article › Scientific › peer-review

30 Citations (Scopus)

Abstract

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, which is needed for fast high-fidelity readout. In addition, simulations show that the large qubit-qubit distance significantly lowers 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±0.02)% fidelity.

Original language	English
Article number	010314
Journal	PRX Quantum
Volume	4
Issue number	1
DOIs	https://doi.org/10.1103/PRXQuantum.4.010314
Publication status	Published - Jan 2023
MoE publication type	A1 Journal article-refereed

Funding

We acknowledge Matthew Sarsby, Roope Kokkoniemi, Ali Yurtalan Jean-Luc Orgiazzi, Lucas Ortega, Jorge Santos, Jaakko Jussila, Illari Kuronen, Jaakko Salo, Tiina Naaranoja, Otto Koskinen, and Tero Somppi for supporting the conceptualization, construction, and maintenance of the experimental setup, Ferenc Dósa-Rácz, Janne Mäntylä, Sinan Inel, and Leon Wubben for additional software support, and Olli-Pentti Saira for valuable discussions. We would additionally like to thank the rest of the IQM team for creating the entire infrastructure, laying the foundation of this work. The work was partly supported by the European Innovation Council (EIC) under Prometheus (Grant No. 959521), by Business Finland (Grant No. 7547/31/2021), and by the German Federal Ministry of Education and Research (BMBF) under the projects Q-Exa (Grant No. 13N16062), QSolid (Grant No. 13N16161), and MUNIQC-SC (Grant No. 13N16185). M.M. is partly supported by the Academy of Finland through its Centers of Excellence Program (Project No. 336810) and by the European Research Council under Advanced Grant ConceptQ (Grant No. 101053801). Parts of this work are included in patents applications filed by IQM Finland Oy. This work has used resources from the OtaNano Micronova cleanroom.

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10.1103/PRXQuantum.4.010314Licence: CC BY

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Marxer, F., Vepsäläinen, A., Jolin, S. W., Tuorila, J., Landra, A., Ockeloen-Korppi, C., Liu, W., Ahonen, O., Auer, A., Belzane, L., Bergholm, V., Chan, C. F., Chan, K. W., Hiltunen, T., Hotari, J., Hyyppä, E., Ikonen, J., Janzso, D., Koistinen, M., ... Heinsoo, J. (2023). Long-Distance Transmon Coupler with cz -Gate Fidelity above 99.8 %. PRX Quantum, 4(1), Article 010314. https://doi.org/10.1103/PRXQuantum.4.010314

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abstract = "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, which is needed for fast high-fidelity readout. In addition, simulations show that the large qubit-qubit distance significantly lowers 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±0.02)% fidelity.",

author = "Fabian Marxer and Antti Veps{\"a}l{\"a}inen and Jolin, {Shan W.} and Jani Tuorila and Alessandro Landra and Caspar Ockeloen-Korppi and Wei Liu and Olli Ahonen and Adrian Auer and Lucien Belzane and Ville Bergholm and Chan, {Chun Fai} and Chan, {Kok Wai} and Tuukka Hiltunen and Juho Hotari and Eric Hyypp{\"a} and Joni Ikonen and David Janzso and Miikka Koistinen and Janne Kotilahti and Tianyi Li and Jyrgen Luus and Miha Papic and Matti Partanen and Jukka R{\"a}bin{\"a} and Jari Rosti and Mykhailo Savytskyi and Marko Sepp{\"a}l{\"a} and Vasilii Sevriuk and Eelis Takala and Brian Tarasinski and Thapa, {Manish J.} and Francesca Tosto and Natalia Vorobeva and Liuqi Yu and Tan, {Kuan Yen} and Juha Hassel and Mikko M{\"o}tt{\"o}nen and Johannes Heinsoo",

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Marxer, F, Vepsäläinen, A, Jolin, SW, Tuorila, J, Landra, A, Ockeloen-Korppi, C, Liu, W, Ahonen, O, Auer, A, Belzane, L, Bergholm, V, Chan, CF, Chan, KW, Hiltunen, T, Hotari, J, Hyyppä, E, Ikonen, J, Janzso, D, Koistinen, M, Kotilahti, J, Li, T, Luus, J, Papic, M, Partanen, M, Räbinä, J, Rosti, J, Savytskyi, M, Seppälä, M, Sevriuk, V, Takala, E, Tarasinski, B, Thapa, MJ, Tosto, F, Vorobeva, N, Yu, L, Tan, KY, Hassel, J, Möttönen, M & Heinsoo, J 2023, 'Long-Distance Transmon Coupler with cz -Gate Fidelity above 99.8 %', PRX Quantum, vol. 4, no. 1, 010314. https://doi.org/10.1103/PRXQuantum.4.010314

TY - JOUR

T1 - Long-Distance Transmon Coupler with cz -Gate Fidelity above 99.8 %

AU - Marxer, Fabian

AU - Vepsäläinen, Antti

AU - Jolin, Shan W.

AU - Tuorila, Jani

AU - Landra, Alessandro

AU - Ockeloen-Korppi, Caspar

AU - Liu, Wei

AU - Ahonen, Olli

AU - Auer, Adrian

AU - Belzane, Lucien

AU - Bergholm, Ville

AU - Chan, Chun Fai

AU - Chan, Kok Wai

AU - Hiltunen, Tuukka

AU - Hotari, Juho

AU - Hyyppä, Eric

AU - Ikonen, Joni

AU - Janzso, David

AU - Koistinen, Miikka

AU - Kotilahti, Janne

AU - Li, Tianyi

AU - Luus, Jyrgen

AU - Papic, Miha

AU - Partanen, Matti

AU - Räbinä, Jukka

AU - Rosti, Jari

AU - Savytskyi, Mykhailo

AU - Seppälä, Marko

AU - Sevriuk, Vasilii

AU - Takala, Eelis

AU - Tarasinski, Brian

AU - Thapa, Manish J.

AU - Tosto, Francesca

AU - Vorobeva, Natalia

AU - Yu, Liuqi

AU - Tan, Kuan Yen

AU - Hassel, Juha

AU - Möttönen, Mikko

AU - Heinsoo, Johannes

N1 - Publisher Copyright: © 2023 authors. Published by the American Physical Society. Published by the American Physical Society under the terms of the "https://creativecommons.org/licenses/by/4.0/"Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.

PY - 2023/1

Y1 - 2023/1

N2 - 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, which is needed for fast high-fidelity readout. In addition, simulations show that the large qubit-qubit distance significantly lowers 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±0.02)% fidelity.

AB - 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, which is needed for fast high-fidelity readout. In addition, simulations show that the large qubit-qubit distance significantly lowers 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±0.02)% fidelity.

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Long-Distance Transmon Coupler with cz -Gate Fidelity above 99.8 %

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Long-Distance Transmon Coupler with cz -Gate Fidelity above 99.8 %

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