Quantum algorithms often benefit from the ability to execute multi-qubit (>2) gates. To date, such multi-qubit gates are typically decomposed into single- and two-qubit gates, particularly in superconducting qubit architectures. The ability to perform multi-qubit operations in a single step could vastly improve the fidelity and execution time of many algorithms. Here, we propose a single shot method for executing an i-Toffoli gate, a three-qubit gate with two control and one target qubit, using currently existing superconducting hardware. We show numerical evidence for a process fidelity over 99.5% and a gate time of 450 ns for superconducting qubits interacting via tunable couplers. Our method can straight forwardly be extended to implement gates with more than two control qubits at similar fidelities.
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Single shot i-Toffoli gate in dispersively coupled superconducting qubits
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31 January 2022
Research Article|
February 03 2022
Single shot i-Toffoli gate in dispersively coupled superconducting qubits
Special Collection:
Emerging Qubit Systems - Novel Materials, Encodings and Architectures
Aneirin J. Baker
;
Aneirin J. Baker
a)
1
SUPA, Institute of Photonics and Quantum Sciences, Heriot-Watt University
, Edinburgh EH14 4AS, United Kingdom
a)Author to whom correspondence should be addressed: ajb17@hw.ac.uk
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Gerhard B. P. Huber;
Gerhard B. P. Huber
2
Department of Physics, Technical University of Munich
, 85748 Garching, Germany
3
Walther-Meißner-Institut, Bayerische Akademie der Wissenschaften
, 85748 Garching, Germany
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Niklas J. Glaser;
Niklas J. Glaser
2
Department of Physics, Technical University of Munich
, 85748 Garching, Germany
3
Walther-Meißner-Institut, Bayerische Akademie der Wissenschaften
, 85748 Garching, Germany
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Federico Roy;
Federico Roy
3
Walther-Meißner-Institut, Bayerische Akademie der Wissenschaften
, 85748 Garching, Germany
4
Theoretical Physics, Saarland University
, 66123 Saarbrücken, Germany
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Ivan Tsitsilin;
Ivan Tsitsilin
2
Department of Physics, Technical University of Munich
, 85748 Garching, Germany
3
Walther-Meißner-Institut, Bayerische Akademie der Wissenschaften
, 85748 Garching, Germany
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Stefan Filipp
;
Stefan Filipp
2
Department of Physics, Technical University of Munich
, 85748 Garching, Germany
3
Walther-Meißner-Institut, Bayerische Akademie der Wissenschaften
, 85748 Garching, Germany
5
Munich Center for Quantum Science and Technology (MSQCT)
, Schellingstraße 4, 80799 München, Germany
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Michael J. Hartmann
Michael J. Hartmann
6
Department of Physics, Friedrich-Alexander University Erlangen-Nürnberg (FAU)
, Erlangen, Germany
and Max Planck Institute for the Science of Light
, Erlangen, Germany
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a)Author to whom correspondence should be addressed: ajb17@hw.ac.uk
Note: This paper is part of the APL Special Collection on Emerging Qubit Systems - Novel Materials, Encodings and Architectures.
Appl. Phys. Lett. 120, 054002 (2022)
Article history
Received:
November 02 2021
Accepted:
January 06 2022
Citation
Aneirin J. Baker, Gerhard B. P. Huber, Niklas J. Glaser, Federico Roy, Ivan Tsitsilin, Stefan Filipp, Michael J. Hartmann; Single shot i-Toffoli gate in dispersively coupled superconducting qubits. Appl. Phys. Lett. 31 January 2022; 120 (5): 054002. https://doi.org/10.1063/5.0077443
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