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TT: Fachverband Tiefe Temperaturen

TT 10: Focus Session: New Bright Sources of Quantum Microwaves

TT 10.4: Hauptvortrag

Montag, 1. April 2019, 16:45–17:15, H2

Photodetectors and metamaterials for on-chip microwave photonics — •Frank K. Wilhelm-Mauch — Theoretical Physics, Saarland University, Campus E2.6, 66123 Saarbrücken, Germany

Superconducting quantum nanodevices are a unique platform for on-chip microwave photonics. They allow engineered sources, strong quantum nonlinearities, and excellent amplification. In this presentation, I will describe two additional toolsets for this platform: For one, the Josephson-Photomultiplier (JPM) allows photodetection of microwaves that is insensitive to the phase. This. on the one hand, can be used to taylor measurement backaction to, e.g., selectively detect only the parity of a quantum register but to not resolve fixed-parity states, and to use create nonclassical microwave states by measurement and displacement only. On the other hand, the JPM is an attractive platform for qubit measurement due to its low technological overhead. I will present new results on the possibility of generalizing this concept to reaching number resolution. On the other hand, superconducting metamaterials can be used to taylor the spectrum of propagating photons. Left-handed transmission lines create a large density of states that can be enhanced even further by using left-handed superlattices. This allows to study a wealth of unconventional dissipative phase-transitions with long-range order.