Abstract-Detection of Coherent Terahertz Radiation from a High-Temperature Superconductor Josephson Junction by a Semiconductor Quantum-Dot Detector

R. Shaikhaidarov, V. N. Antonov, A. Casey, A. Kalaboukhov, S. Kubatkin, Y. Harada, K. Onomitsu, A. Tzalenchuk, and A. Sobolev

Phys. Rev. Applied 5, 024010 – Published 22 February 2016

https://journals.aps.org/prapplied/abstract/10.1103/PhysRevApplied.5.024010

We examine the application of Josephson radiation emitters to spectral calibration of single-photon-resolving detectors. Josephson junctions are patterned in a YBCO film on a bicrystal sapphire substrate and are voltage controlled to generate radiation in the frequency range of 0.05–1 THz. The detector used in this work consists of a gate-defined quantum-dot photon-to-charge transducer coupled to a single-electron transistor. Both the emitter and the detector are equipped with a matching on-chip wide-band antenna. The combination of a tuneable emitter and detector allows us to determine the efficacy of the YBCO emitter and also to analyze the elementary processes involved in the detection.

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