Regensburg 2022 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 31: Superconducting Electronics and Cryogenics: Poster Session

TT 31.21: Poster

Thursday, September 8, 2022, 15:00–18:00, P1

Exploring the parameter regimes of superconducting Quarton qubits coupled via cross-Kerr nonlinearity — •Hossam Tohamy¹, Alex Siegfried Kreuzer¹, Thilo Krumrey¹, Hannes Rotzinger^1,2, and Alexey V. Ustinov^1,2 — ¹Physikalisches Institut, Karlsruhe Institute of Technology, 76131 Karlsruhe, Germany — ²Institute for Quantum Materials and Technologies, Karlsruhe Institute of Technology, 76021 Karlsruhe, Germany

Over the last two decades, tremendous efforts have been directed into studying superconducting qubits as a promising architecture for noisy intermediate-scale quantum processors to implement quantum simulations and algorithms. A recent superconducting qubit named the "Quarton" represents a generalized flux qubit featured by a quartic potential profile. It can offer positive, strong cross-Kerr nonlinearity compared to the ordinary linear dispersive coupling between qubits and resonators. This nonlinearity can be essential, e.g., to achieve the next milestones in quantum simulation, such as the simulation of model Hamiltonians where strong photon-photon interactions are possible via nonlinear elements.

To employ the quarton as a qubit and a coupler, a system of two primary quarton qubits coupled via a quarton qubit coupler is studied. We report on numerical results demonstrating the normal modes of the system. The calculations are based on a Hamiltonian derived from a circuit quantization model. The work is linked to ongoing experimental efforts for realizing multiqubit architecture based on quartons.