Fast, High-Fidelity Conditional-Phase Gate Exploiting Leakage Interference in Weakly Anharmonic Superconducting Qubits

M. A. Rol; F. Battistel; F. K. Malinowski; C. C. Bultink; B. M. Tarasinski; R. Vollmer; N. Haider; N. Muthusubramanian; A. Bruno; B. M. Terhal; L. Dicarlo

doi:10.1103/PhysRevLett.123.120502

Fast, High-Fidelity Conditional-Phase Gate Exploiting Leakage Interference in Weakly Anharmonic Superconducting Qubits

M. A. Rol, F. Battistel, F. K. Malinowski, C. C. Bultink, B. M. Tarasinski, R. Vollmer, N. Haider, N. Muthusubramanian, A. Bruno, B. M. Terhal, L. Dicarlo

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

63 Citations (Scopus)

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Abstract

Conditional-phase (cz) gates in transmons can be realized by flux pulsing computational states towards resonance with noncomputational ones. We present a 40 ns cz gate based on a bipolar flux pulse suppressing leakage (0.1%) by interference and approaching the speed limit set by exchange coupling. This pulse harnesses a built-in echo to enhance fidelity (99.1%) and is robust to long-timescale distortion in the flux-control line, ensuring repeatability. Numerical simulations matching experiment show that fidelity is limited by high-frequency dephasing and leakage by short-timescale distortion.

Original language	English
Article number	120502
Number of pages	6
Journal	Physical Review Letters
Volume	123
Issue number	12
DOIs	https://doi.org/10.1103/PhysRevLett.123.120502
Publication status	Published - 2019

Keywords

quantum benchmarking
quantum control
quantum gates
superconducting qubits

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10.1103/PhysRevLett.123.120502

PhysRevLett.123.120502Final published version, 1.12 MBLicence: CC BY

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Rol, M. A., Battistel, F., Malinowski, F. K., Bultink, C. C., Tarasinski, B. M., Vollmer, R., Haider, N., Muthusubramanian, N., Bruno, A., Terhal, B. M., & Dicarlo, L. (2019). Fast, High-Fidelity Conditional-Phase Gate Exploiting Leakage Interference in Weakly Anharmonic Superconducting Qubits. Physical Review Letters, 123(12), [120502]. https://doi.org/10.1103/PhysRevLett.123.120502

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title = "Fast, High-Fidelity Conditional-Phase Gate Exploiting Leakage Interference in Weakly Anharmonic Superconducting Qubits",

abstract = "Conditional-phase (cz) gates in transmons can be realized by flux pulsing computational states towards resonance with noncomputational ones. We present a 40 ns cz gate based on a bipolar flux pulse suppressing leakage (0.1%) by interference and approaching the speed limit set by exchange coupling. This pulse harnesses a built-in echo to enhance fidelity (99.1%) and is robust to long-timescale distortion in the flux-control line, ensuring repeatability. Numerical simulations matching experiment show that fidelity is limited by high-frequency dephasing and leakage by short-timescale distortion.",

keywords = "quantum benchmarking, quantum control, quantum gates, superconducting qubits",

author = "Rol, {M. A.} and F. Battistel and Malinowski, {F. K.} and Bultink, {C. C.} and Tarasinski, {B. M.} and R. Vollmer and N. Haider and N. Muthusubramanian and A. Bruno and Terhal, {B. M.} and L. Dicarlo",

year = "2019",

doi = "10.1103/PhysRevLett.123.120502",

language = "English",

volume = "123",

journal = "Physical Review Letters",

issn = "0031-9007",

publisher = "American Physical Society",

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Rol, MA, Battistel, F, Malinowski, FK, Bultink, CC, Tarasinski, BM, Vollmer, R, Haider, N , Muthusubramanian, N, Bruno, A, Terhal, BM & Dicarlo, L 2019, 'Fast, High-Fidelity Conditional-Phase Gate Exploiting Leakage Interference in Weakly Anharmonic Superconducting Qubits', Physical Review Letters, vol. 123, no. 12, 120502. https://doi.org/10.1103/PhysRevLett.123.120502

Fast, High-Fidelity Conditional-Phase Gate Exploiting Leakage Interference in Weakly Anharmonic Superconducting Qubits. / Rol, M. A.; Battistel, F.; Malinowski, F. K.; Bultink, C. C.; Tarasinski, B. M.; Vollmer, R.; Haider, N.; Muthusubramanian, N.; Bruno, A.; Terhal, B. M.; Dicarlo, L.

In: Physical Review Letters, Vol. 123, No. 12, 120502, 2019.

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

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AU - Rol, M. A.

AU - Battistel, F.

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AU - Bultink, C. C.

AU - Tarasinski, B. M.

AU - Vollmer, R.

AU - Haider, N.

AU - Muthusubramanian, N.

AU - Bruno, A.

AU - Terhal, B. M.

AU - Dicarlo, L.

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AB - Conditional-phase (cz) gates in transmons can be realized by flux pulsing computational states towards resonance with noncomputational ones. We present a 40 ns cz gate based on a bipolar flux pulse suppressing leakage (0.1%) by interference and approaching the speed limit set by exchange coupling. This pulse harnesses a built-in echo to enhance fidelity (99.1%) and is robust to long-timescale distortion in the flux-control line, ensuring repeatability. Numerical simulations matching experiment show that fidelity is limited by high-frequency dephasing and leakage by short-timescale distortion.

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Fast, High-Fidelity Conditional-Phase Gate Exploiting Leakage Interference in Weakly Anharmonic Superconducting Qubits

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