Unimon qubit

Eric Hyyppä; Suman Kundu; Chun Fai Chan; András Gunyhó; Juho Hotari; David Janzso; Kristinn Juliusson; Olavi Kiuru; Janne Kotilahti; Alessandro Landra; Wei Liu; Fabian Marxer; Akseli Mäkinen; Jean Luc Orgiazzi; Mario Palma; Mykhailo Savytskyi; Francesca Tosto; Jani Tuorila; Vasilii Vadimov; Tianyi Li; Caspar Ockeloen-Korppi; Johannes Heinsoo; Kuan Yen Tan; Juha Hassel; Mikko Möttönen

doi:10.1038/s41467-022-34614-w

Unimon qubit

Eric Hyyppä^*
, Suman Kundu
, Chun Fai Chan
, András Gunyhó
, Juho Hotari
, David Janzso
, Kristinn Juliusson
, Olavi Kiuru
, Janne Kotilahti
, Alessandro Landra
, Wei Liu
, Fabian Marxer
, Akseli Mäkinen
, Jean Luc Orgiazzi
, Mario Palma
, Mykhailo Savytskyi
, Francesca Tosto
, Jani Tuorila
, Vasilii Vadimov
, Tianyi Li

Caspar Ockeloen-Korppi, Johannes Heinsoo, Kuan Yen Tan, Juha Hassel, Mikko Möttönen^*

^*Corresponding author for this work

IQM Finland Oy
Aalto University
VTT (former employee or external)

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

35 Citations (Scopus)

Abstract

Superconducting qubits seem promising for useful quantum computers, but the currently wide-spread qubit designs and techniques do not yet provide high enough performance. Here, we introduce a superconducting-qubit type, the unimon, which combines the desired properties of increased anharmonicity, full insensitivity to dc charge noise, reduced sensitivity to flux noise, and a simple structure consisting only of a single Josephson junction in a resonator. In agreement with our quantum models, we measure the qubit frequency, ω₀₁/(2π), and increased anharmonicity α/(2π) at the optimal operation point, yielding, for example, 99.9% and 99.8% fidelity for 13 ns single-qubit gates on two qubits with (ω₀₁, α) = (4.49 GHz, 434 MHz) × 2π and (3.55 GHz, 744 MHz) × 2π, respectively. The energy relaxation seems to be dominated by dielectric losses. Thus, improvements of the design, materials, and gate time may promote the unimon to break the 99.99% fidelity target for efficient quantum error correction and possible useful quantum advantage with noisy systems.

Original language	English
Article number	6895
Journal	Nature Communications
Volume	13
Issue number	1
DOIs	https://doi.org/10.1038/s41467-022-34614-w
Publication status	Published - 12 Nov 2022
MoE publication type	A1 Journal article-refereed

Funding

S.K., A.G., O.K., V.V., and M.M. acknowledge funding from the European Research Council under Consolidator Grant No. 681311 (QUESS) and Advanced Grant No. 101053801 (ConceptQ), European Commission through H2020 program projects QMiCS (grant agreement 820505, Quantum Flagship), the Academy of Finland through its Centers of Excellence Program (project Nos. 312300, and 336810), and Business Finland through its Quantum Technologies Industrial grant No. 41419/31/2020. S.K. and M.M. acknowledge Research Impact Foundation for grant No. 173 (CONSTI). E.H. thanks Emil Aaltonen Foundation (grant No. 220056 K) and Nokia Foundation (grant No. 20230659) for funding. We acknowledge the provision of facilities and technical support by Aalto University at OtaNano - Micronova Nanofabrication Center and LTL infrastructure which is part of European Microkelvin Platform (EMP, No. 824109 EU Horizon 2020). We thank the whole staff at IQM and QCD Labs for their support. Especially, we acknowledge the help with the experimental setup from Roope Kokkoniemi, code and software support from Joni Ikonen, Tuukka Hiltunen, Shan Jolin, Miikka Koistinen, Jari Rosti, Vasilii Sevriuk, and Natalia Vorobeva, and useful discussions with Brian Tarasinski. S.K., A.G., O.K., V.V., and M.M. acknowledge funding from the European Research Council under Consolidator Grant No. 681311 (QUESS) and Advanced Grant No. 101053801 (ConceptQ), European Commission through H2020 program projects QMiCS (grant agreement 820505, Quantum Flagship), the Academy of Finland through its Centers of Excellence Program (project Nos. 312300, and 336810), and Business Finland through its Quantum Technologies Industrial grant No. 41419/31/2020. S.K. and M.M. acknowledge Research Impact Foundation for grant No. 173 (CONSTI). E.H. thanks Emil Aaltonen Foundation (grant No. 220056 K) and Nokia Foundation (grant No. 20230659) for funding. We acknowledge the provision of facilities and technical support by Aalto University at OtaNano - Micronova Nanofabrication Center and LTL infrastructure which is part of European Microkelvin Platform (EMP, No. 824109 EU Horizon 2020). We thank the whole staff at IQM and QCD Labs for their support. Especially, we acknowledge the help with the experimental setup from Roope Kokkoniemi, code and software support from Joni Ikonen, Tuukka Hiltunen, Shan Jolin, Miikka Koistinen, Jari Rosti, Vasilii Sevriuk, and Natalia Vorobeva, and useful discussions with Brian Tarasinski.

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title = "Unimon qubit",

abstract = "Superconducting qubits seem promising for useful quantum computers, but the currently wide-spread qubit designs and techniques do not yet provide high enough performance. Here, we introduce a superconducting-qubit type, the unimon, which combines the desired properties of increased anharmonicity, full insensitivity to dc charge noise, reduced sensitivity to flux noise, and a simple structure consisting only of a single Josephson junction in a resonator. In agreement with our quantum models, we measure the qubit frequency, ω01/(2π), and increased anharmonicity α/(2π) at the optimal operation point, yielding, for example, 99.9\% and 99.8\% fidelity for 13 ns single-qubit gates on two qubits with (ω01, α) = (4.49 GHz, 434 MHz) × 2π and (3.55 GHz, 744 MHz) × 2π, respectively. The energy relaxation seems to be dominated by dielectric losses. Thus, improvements of the design, materials, and gate time may promote the unimon to break the 99.99\% fidelity target for efficient quantum error correction and possible useful quantum advantage with noisy systems.",

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Hyyppä, E, Kundu, S, Chan, CF, Gunyhó, A, Hotari, J, Janzso, D, Juliusson, K, Kiuru, O, Kotilahti, J, Landra, A, Liu, W, Marxer, F, Mäkinen, A, Orgiazzi, JL, Palma, M, Savytskyi, M, Tosto, F, Tuorila, J, Vadimov, V, Li, T, Ockeloen-Korppi, C, Heinsoo, J, Tan, KY, Hassel, J & Möttönen, M 2022, 'Unimon qubit', Nature Communications, vol. 13, no. 1, 6895. https://doi.org/10.1038/s41467-022-34614-w

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AU - Hyyppä, Eric

AU - Kundu, Suman

AU - Chan, Chun Fai

AU - Gunyhó, András

AU - Hotari, Juho

AU - Janzso, David

AU - Juliusson, Kristinn

AU - Kiuru, Olavi

AU - Kotilahti, Janne

AU - Landra, Alessandro

AU - Liu, Wei

AU - Marxer, Fabian

AU - Mäkinen, Akseli

AU - Orgiazzi, Jean Luc

AU - Palma, Mario

AU - Savytskyi, Mykhailo

AU - Tosto, Francesca

AU - Tuorila, Jani

AU - Vadimov, Vasilii

AU - Li, Tianyi

AU - Ockeloen-Korppi, Caspar

AU - Heinsoo, Johannes

AU - Tan, Kuan Yen

AU - Hassel, Juha

AU - Möttönen, Mikko

PY - 2022/11/12

Y1 - 2022/11/12

N2 - Superconducting qubits seem promising for useful quantum computers, but the currently wide-spread qubit designs and techniques do not yet provide high enough performance. Here, we introduce a superconducting-qubit type, the unimon, which combines the desired properties of increased anharmonicity, full insensitivity to dc charge noise, reduced sensitivity to flux noise, and a simple structure consisting only of a single Josephson junction in a resonator. In agreement with our quantum models, we measure the qubit frequency, ω01/(2π), and increased anharmonicity α/(2π) at the optimal operation point, yielding, for example, 99.9% and 99.8% fidelity for 13 ns single-qubit gates on two qubits with (ω01, α) = (4.49 GHz, 434 MHz) × 2π and (3.55 GHz, 744 MHz) × 2π, respectively. The energy relaxation seems to be dominated by dielectric losses. Thus, improvements of the design, materials, and gate time may promote the unimon to break the 99.99% fidelity target for efficient quantum error correction and possible useful quantum advantage with noisy systems.

AB - Superconducting qubits seem promising for useful quantum computers, but the currently wide-spread qubit designs and techniques do not yet provide high enough performance. Here, we introduce a superconducting-qubit type, the unimon, which combines the desired properties of increased anharmonicity, full insensitivity to dc charge noise, reduced sensitivity to flux noise, and a simple structure consisting only of a single Josephson junction in a resonator. In agreement with our quantum models, we measure the qubit frequency, ω01/(2π), and increased anharmonicity α/(2π) at the optimal operation point, yielding, for example, 99.9% and 99.8% fidelity for 13 ns single-qubit gates on two qubits with (ω01, α) = (4.49 GHz, 434 MHz) × 2π and (3.55 GHz, 744 MHz) × 2π, respectively. The energy relaxation seems to be dominated by dielectric losses. Thus, improvements of the design, materials, and gate time may promote the unimon to break the 99.99% fidelity target for efficient quantum error correction and possible useful quantum advantage with noisy systems.

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DO - 10.1038/s41467-022-34614-w

M3 - Article

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SN - 2041-1723

VL - 13

JO - Nature Communications

JF - Nature Communications

IS - 1

M1 - 6895

ER -

Unimon qubit

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