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TT: Fachverband Tiefe Temperaturen

TT 58: Superconductivity: Qubits 2

TT 58.8: Vortrag

Donnerstag, 4. April 2019, 17:00–17:15, Theater

Investigating a Superconducting Quantum Metamaterial in a Waveguide — •Jan David Brehm¹, Tim Wolz¹, Alexander Stehli¹, Hannes Rotzinger¹, and Alexey V. Ustinov^1,2 — ¹Karlsruhe Institute of Technology, Institute of Physics, Karlsruhe, Germany — ²Russian Quantum Center, National University of Science and Technology MISIS, Moscow, Russia

Quantum metamaterials extend the idea of classical metamaterials to a regime where the quantum coherence of the meta-atoms exceeds the typical time of a wave propagation through the medium. In recent works, it was proposed that this regime gives rise to various collective light-matter interaction effects such as self-induced transparency, quasi-superradiant phase transitions and lasing. Here, we investigate a one-dimensional quantum material which consists of an array of 80 transmon qubits coupled to a continuum of light modes of a coplanar waveguide. Since specific frequency control of the individual qubits is at the current stage of technology not feasible, we rely on strong qubit-waveguide coupling and optimizing the parameter spread by improving the circuit fabrication techniques, to reduce disorder in the metamaterial. Our qubit-based material exhibits a broad engineered bandgap, which is significantly larger than a single qubit linewidth. Beside detailed spectroscopic characterization we will present first experimental results on the time-resolved transmission of short microwave pulses through the metamterial.