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Photograph of SFQ readout circuit consisting of MC-dc/SFQ converter, Josephson transmission lines, and voltage driver.
Experimental setup for ER measurement of readout circuit by using actual output pulses from the SSPD. This setup is also applied to the DE measurement by exchanging the input photon source.
Error rate curves of readout circuit vs . Inset shows pulse counts from an SSPD vs without connecting a readout circuit.
Plot of DEs for single-photon incidents vs .
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