A Cryogenic $30 ~\text{Gb} / \mathrm{s}$ PAM3 BiCMOS Serializer for Josephson Arbitrary Waveform Synthesizer

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This paper presents a cryogenic$30 ~\text{Gb} / \mathrm{s} 16: 1$PAM3 data serializer integrated circuit (IC) with return-to-zero (RZ) encoding designed to drive Josephson arbitrary waveform synthesizers (JAWS). In combination with a JAWS device, the presented IC can be used to realize an ultra-low-noise arbitrary waveform generator for single-flux quantum electronics applicable in metrology as a Josephson voltage standard or for readout in quantum computing. The proposed system enables scalability by efficiently distributing the high-speed clock signals to the different stages of the serializer, facilitating the integration of larger numbers of qubits and more complex quantum circuits in future quantum computing architectures. The proposed JAWS driver consumes 438 mW and reaches$30 ~\text{Gb} / \mathrm{s}$at 14 K, while at room temperature (RT) it draws 306 mW and achieves$30 ~\text{Gb} / \mathrm{s}$.

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