Freiburg 2019 – scientific programme

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FM: Fall Meeting

FM 80: Enabling Technologies: Cavity QED

FM 80.5: Talk

Thursday, September 26, 2019, 15:15–15:30, 2006

Scaling up superconducting qubits beyond the dispersive regime — Mohammad Ansari and •Xuexin Xu — Forschungszentrum Jülich, Jülich Aachen Reseach Alliance (JARA), Jülich, Germany

Superconducting circuits consisting of a few transmons coupled to resonators can perform basic quantum computations; however such small scale circuits are unable to perform the power of quantum computation. Scaling up the number of qubits on the other hand will bring the circuit out of quantum control mainly because of noises. In order to come out of such dilemma, we need to look for other possibilities. This requires to further look into theory and improve it. For this aim we develop a new formalism that allows to consistently diagonalize superconducting circuit hamiltonian beyond perturbative regime. This will allow to study qubit-qubit interaction unperturbatively, therefore our formalism remains valid and accurate at any frequency detuning and interaction coupling. Moreover our formalism serves as a theoretical ground for designing qubit characteristics in scaling up.

Reference: M.H. Ansari, Superconducting qubits beyond the dispersive regime, arXiv:1807.00792 (To be published in Phys. Rev. B)