Authors:

Eric Zhang

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About Paper:

Quantum mechanics governs the behavior of matter and light at the microscopic scale, underpinning modern technologies like semiconductors, lasers, and emerging computing platforms. Studying them requires precise quantum-limited measurements, involving fragile quantum states that can only survive in ultra-low electronic temperature environments. External electrical noise from measurement electronics and the surrounding environment can heat ultra-cold electrons and disrupt these quantum states. To mitigate noise-induced decoherence, cryogenic low-pass filters are required in quantum measurement systems to suppress high-frequency noise. In this work, we present the design, fabrication, and experimental characterization of silver-epoxy cryogenic filters for ultra-low electronic temperature quantum measurements. The filters are constructed by embedding resistive wiring in conductive epoxy, providing broadband electromagnetic attenuation while simultaneously thermalizing the measurement lines. We characterize filter performance through attenuation measurements and evaluate their impact on electrical noise in low-temperature transport experiments. The measured performance aligns with expectations from established cryogenic filter designs and demonstrates effective suppression of high-frequency noise relevant for quantum devices. Practical considerations including fabrication reproducibility, mechanical robustness, and integration into cryogenic wiring stacks are also discussed. This work validates the implementation of silver-epoxy filters and highlights their importance in improving measurement stability and noise performance in quantum condensed-matter experiments. SPOOSSOSOH SO OOO OSS SH OSOSHS SS SHOT OC HOHSEC HSS OOSOSCOHESEOOSEOLO

Source:

University of Illinois Urbana-Champaign

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Co-authors:

Eric Zhang