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TT: Fachverband Tiefe Temperaturen
TT 18: Superconductivity: Poster
TT 18.39: Poster
Monday, March 18, 2024, 15:00–18:00, Poster C
Interaction of Josephson Photonics Devices with Quantum pulses — •Hanna Zeller1, Lukas Danner1,2, Ciprian Padurariu1, Björn Kubala1,2, and Joachim Ankerhold1 — 1ICQ and IQST, Ulm University, Ulm, Germany — 2Institute of Quantum Technologies, German Aerospace Center (DLR), Ulm, Germany
Josephson photonics devices have predominantly been used to create microwave radiation in a process where a Cooper pair tunneling across a dc-biased Josephson junction creates photonic excitations in a microwave cavity connected in series. In turn, there are also situations where incoming photons are required to enable the Cooper pair transfer. In fact, this scenario has been investigated as a technology for amplifiers or single (microwave-) photon detectors [1].
To study such processes we use a recently developed formalism which can describe the incidence of generic traveling pulses of quantized radiation onto a quantum device [2,3]. In- and outgoing signals are modeled by auxiliary cavities coupled in a cascaded manner to the quantum device where the pulse shape is associated with a time dependent loss rate while the full quantum state of the corresponding mode is encoded in the auxiliary cavities. Here, we present first results demonstrating that the resulting cascaded master equation is optimally suited to study the operation of Josephson photonics devices as detectors.
[1] R. Albertet al., accepted by Phys. Rev. X, arXiv:2303.03173.
[2] A. H. Kiilerich et al., Phys. Rev. Lett. 123, 123604 (2019).
[3] A. H. Kiilerich et al., Phys. Rev. A 102, 023717 (2020).
Keywords: Quantum pulses; Microwave photons; Input-output theory; Cascaded quantum system