Vibration-induced electrical noise in a cryogen-free dilution refrigerator: characterization, mitigation, and impact on qubit coherence
| Autor: | Daniel Bar, Arne Laucht, Stephanie Simmons, Andrea Morello, Solomon Freer, Rachpon Kalra, Juan Pablo Dehollain, Juha T. Muhonen |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2016 |
| Předmět: |
010302 applied physics
Physics Physics - Instrumentation and Detectors Condensed Matter - Mesoscale and Nanoscale Physics Physics::Instrumentation and Detectors Acoustics Quantum noise FOS: Physical sciences Flexible cable Instrumentation and Detectors (physics.ins-det) Cryocooler 01 natural sciences Noise (electronics) Vibration 02 Physical Sciences 03 Chemical Sciences 09 Engineering Qubit Mesoscale and Nanoscale Physics (cond-mat.mes-hall) 0103 physical sciences Dilution refrigerator 010306 general physics Instrumentation Applied Physics Coherence (physics) |
| Popis: | Cryogen-free low-temperature setups are becoming more prominent in experimental science due to their convenience and reliability, and concern about the increasing scarcity of helium as a natural resource. Despite not having any moving parts at the cold end, pulse tube cryocoolers introduce vibrations that can be detrimental to the experiments. We characterize the coupling of these vibrations to the electrical signal observed on cables installed in a cryogen-free dilution refrigerator. The dominant electrical noise is in the 5 to 10 kHz range and its magnitude is found to be strongly temperature dependent. We test the performance of different cables designed to diagnose and tackle the noise, and find triboelectrics to be the dominant mechanism coupling the vibrations to the electrical signal. Flattening a semi-rigid cable or jacketing a flexible cable in order to restrict movement within the cable, successfully reduces the noise level by over an order of magnitude. Furthermore, we characterize the effect of the pulse tube vibrations on an electron spin qubit device in this setup. Coherence measurements are used to map out the spectrum of the noise experienced by the qubit, revealing spectral components matching the spectral signature of the pulse tube. 13 pages, 10 figures |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|