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Net-Zero two-qubit gate published in Physical Review Letters

We have recently developed a new type of conditional-phase gate for transmon qubits providing several key improvements over standard flux-pulsing-based versions. The Net-Zero gate uses “leakage interference” to minimize leakage to non-computational states. The zero-average, bipolar shape of the pulse makes the gate robust to long timescale distortions in the flux control line and additionally provides an echo effect. We demonstrate a state-of-the-art conditional-phase gate of duration 40 ns achieving 99.1% fidelity and 0.1% leakage.

We invite you to check our paper at Physical Review Letters or ArXiv .

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Fast, High-Fidelity Conditional-Phase Gate Exploiting Leakage Interference in Weakly Anharmonic Superconducting Qubits
Phys. Rev. Lett. 123, 120502 (2019)
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 and L. DiCarlo

BibTeX:

@article{Rol19_NetZero,
    Author = {M. A. Rol and F. Battistel and F. K. Malinowski and C. C. Bultink and B. M. Tarasinski and R. Vollmer and N. Haider and N. Muthusubramanian and A. Bruno and B. M. Terhal and L. DiCarlo},
    Title = {Fast, High-Fidelity Conditional-Phase Gate Exploiting Leakage Interference in Weakly Anharmonic Superconducting Qubits},
    journal = {Physical Review Letters},
    volume = {123},
    pages = {120502},
    year = {2019},
    url={https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.123.120502},
    arxivId = {1903.02492},
    }

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