SKM 2021 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 5: Poster Session: Superconductivity
TT 5.29: Poster
Montag, 27. September 2021, 13:30–16:00, P
Two-qubit gates between two transmons via parametrically driven coupling circuits — •Miriam Resch1,2, Aneirin J. Baker3, and Michael J. Hartmann1,4 — 1Physics Department, Friedrich-Alexander-University Erlangen Nürnberg, Germany — 2ICQ and IQST, Ulm University, Germany — 3Institute of Photonics and Quantum Sciences, Heriot-Watt University Edinburgh EH14 4AS, United Kingdom — 4Max Planck Institute for the Science of Light, 91058 Erlangen, Germany
One important ingredient of quantum computation is the ability to implement gates that are efficient as well as precise to perform various operations on qubits. In the case of superconducting qubits, two-qubit gates can be implemented using a tunable coupler, where interaction terms in the Hamiltonian can be turned on and off. In this work we study the effective coupling of two transmon qubits through a coupler whose parameters are externally driven with a frequency ωD. Depending on the drive frequency, the excitation number conserving interaction of an iSWAP gate, σ1+σ2−+σ1−σ2+, or the interaction of a bSWAP gate, σ1+σ2++σ1−σ2−, which does not conserve excitation numbers, can be created. Using an approach that considers the time dependent magnetic modulation of the coupler in a non-perturbative way, we find that the interaction of the bSWAP gate can be realized by driving the system with the average of the two qubit transition-frequencies. This result eliminates the demand for external drives at frequencies above 6 or 7 GHz for realizing interactions that break excitation number conservation and can thus realize bSWAP gates.