Single shot i-Toffoli gate in dispersively coupled superconducting qubits

Aneirin J. Baker; Gerhard B. P. Huber; Niklas J. Glaser; Federico Roy; Ivan Tsitsilin; Stefan Filipp; Michael J. Hartmann

doi:10.1063/5.0077443

Single shot i-Toffoli gate in dispersively coupled superconducting qubits

Aneirin J. Baker^*, Gerhard B. P. Huber, Niklas J. Glaser, Federico Roy, Ivan Tsitsilin, Stefan Filipp, Michael J. Hartmann

^*Corresponding author for this work

School of Engineering & Physical Sciences

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

4 Citations (Scopus)

Abstract

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.

Original language	English
Article number	054002
Journal	Applied Physics Letters
Volume	120
Issue number	5
DOIs	https://doi.org/10.1063/5.0077443
Publication status	Published - 31 Jan 2022

ASJC Scopus subject areas

Physics and Astronomy (miscellaneous)

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title = "Single shot i-Toffoli gate in dispersively coupled superconducting qubits",

abstract = "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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note = "Funding Information: This work has received funding from the European Union{\textquoteright}s Horizon 2020 research and innovation program under Grant Agreement No. 828826 “Quromorphic” and the MSCA Cofund Action under No. 847471 “Qustec,” from the German Federal Ministry of Education and Research via the funding program quantum technologies—from basic research to the market under Contract No. 13N15684 and 13N15680 “GeQCoS,” and support from EPSRC DTP under Grant No. EP/R513040/1. Funding Information: This work has received funding from the European Union's Horizon 2020 research and innovation program under Grant Agreement No. 828826 ?Quromorphic? and the MSCA Cofund Action under No. 847471 ?Qustec,? from the German Federal Ministry of Education and Research via the funding program quantum technologies?from basic research to the market under Contract No. 13N15684 and 13N15680 ?GeQCoS,? and support from EPSRC DTP under Grant No. EP/R513040/1. Publisher Copyright: {\textcopyright} 2022 Author(s).",

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Single shot i-Toffoli gate in dispersively coupled superconducting qubits

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