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Superconducting quantum circuits are artificial structures with a possibility to engineer their key parameters by design and fabrication. Moreover, many of these parameters can be in-situ tuned during experiments. These attractive properties have made superconducting circuits an ideal platform for quantum engineering such as quantum information processing and quantum optics on a chip. In this talk, I will underline the main physical mechanisms of these systems and will focus on benefits of the superconducting devices for waveguide quantum electrodynamics (QED), a regime where one or several quantum emitters are coupled strongly to a continuum of electromagnetic modes in one dimension. I will show that a basic ingredient of waveguide QED, a single qubit in a waveguide, behaves as a mirror with its transparency depending on the frequency and power of the incoming radiation. I will then show that when two qubits are inserted in a waveguide one can observe additional cooperative effects dependent on the distance between the qubits. Finally, I will outline how these non-local cooperative interactions can be used to create non-reciprocal transmission, distribute entanglement and generate new physical regimes of light-matter interaction.

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Arkady Fedorov, University Queensland
Seminarraum alte Theorie
Contact: Alexander Grüneis