Analysis of a single-mode waveguide at sub-terahertz frequencies as a communication channel

Journal article (2020)

Authors

M.P. Westig Kavli institute of nanoscience Delft, Freie Universität Berlin, QN/Klapwijk Lab
R. Thierschmann QN/Klapwijk Lab , Kavli institute of nanoscience Delft
A.J. Katan Kavli institute of nanoscience Delft, QN/Afdelingsbureau
M. Finkel QN/Klapwijk Lab , Kavli institute of nanoscience Delft
T.M. Klapwijk Kavli institute of nanoscience Delft, QN/Klapwijk Lab
Research Group
QN/Afdelingsbureau
Copyright: © 2020 M.P. Westig, R. Thierschmann, A.J. Katan, M. Finkel, T.M. Klapwijk
DOI: https://doi.org/10.1063/1.5128451
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Published Date

2020

Language

English

Research Group

QN/Afdelingsbureau

Abstract

We study experimentally the transmission of an electromagnetic waveguide in the frequency range from 160 to 300 GHz. Photo-mixing is used to excite and detect the fundamental TE10 mode in a rectangular waveguide with two orders-of-magnitude lower impedance. The large impedance mismatch leads to a strong frequency dependence of the transmission, which we measure with a high-dynamic range of up to 80 dB and with high frequency-resolution. The modified transmission function is directly related to the information rate of the waveguide, which we estimate to be about 1 bit per photon. We suggest that the results are applicable to a Josephson junction employed as a single-photon source and coupled to a superconducting waveguide to achieve a simple on-demand narrow-bandwidth free-space number-state quantum channel.