Isolation solution for extreme environmental vibrations for quantum-enabling cryogenic setups installed on raised frames

TL;DR

This paper presents a dual-stage active vibration isolation system for cryogenic setups, effectively reducing environmental vibrations and enabling the use of sensitive quantum experiments in standard research environments.

Contribution

It introduces a novel dual-stage active vibration isolation method with a custom steel tower, expanding cryogenic quantum sensing applications beyond quiet specialized facilities.

Findings

Achieves 20-40 dB vibration attenuation with active systems engaged.

Reduces vibrations to VC-G range on the cryostat's baseplate and support tower.

Enables cryogenic quantum experiments in open-floor research centers.

Abstract

Cryogenic quantum sensing techniques are developing alongside the ever-increasing requirements for noiseless experimental environments. For instance, several groups have isolated internal system vibrations from cold heads in closed-cycle dilution refrigerators. However, these solutions often do not account for external vibrations, necessitating novel strategies to isolate the entire cryogenic systems from their environments in a particular set of raised cryostats. Here, we introduce a dual-stage external active vibration-isolation solution in conjunction with a closed-cycle dilution refrigerator that isolates it from the environment. This dual stage includes two sets of active attenuators and a customized steel tower for supporting experimental probes at heights of 3 m from the floor. Both stages achieve 20-40 dB of attenuation with the active systems engaged, corresponding to levels of vibration in the VC-G range (a standardized Vibration Criterion appropriate for extremely quiet research spaces) on the cryostat's room temperature baseplate and the steel tower. Our unique vibration isolation solution therefore expands the applications of modern cryogenic equipment beyond exclusively quiet specialty buildings, rendering such equipment suitable for interdisciplinary, open-floor research centers.