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Figure 7 | EPJ Quantum Technology

Figure 7

From: Engineering the microwave to infrared noise photon flux for superconducting quantum systems

Figure 7

The estimation of reduction of noise photon occupation number caused by the use of the Esorb-230 filter or thinner UT047SS-SS and UT034SS-SS coaxial cables. The red line shows the case of the unfiltered UT086SS-SS coaxial line, where on average \(\partial \overline{n}/\partial t\simeq 1420\) photons in the 82 to 110 GHz frequency range exit the end of the coaxial cable at the mixing chamber per second. When thinner cables are used, the average photon number is reduced (green and magenta lines). The use of the filter dramatically reduces the average flow of noise photons (\(\partial \overline{n}/\partial t \ll 1\)) for the same frequency range. Blue line is an estimate based on the measured electromagnetic properties of Esorb-230, and the black line is the upper bound estimated based on the measured S-parameters of the filter

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