Analysis of a single-mode waveguide at sub-terahertz frequencies as a communication channel
M.P. Westig (Freie Universität Berlin, Kavli institute of nanoscience Delft, QN/Klapwijk Lab)
R. Thierschmann (QN/Klapwijk Lab, Kavli institute of nanoscience Delft)
Allard J. Katan (Kavli institute of nanoscience Delft, TU Delft - QN/Afdelingsbureau)
Matvey Finkel (Kavli institute of nanoscience Delft, QN/Klapwijk Lab)
T.M. Klapwijk (Kavli institute of nanoscience Delft, QN/Klapwijk Lab)
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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.
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