We gratefully acknowledge support by:
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“Optomechanical Technologies OMT” (www.omt‐etn.net) is an EU H2020 Marie Curie Skłodowska – European Training Network (ETN) , funded under grant agreement 722923.
“Nanoscale Coherent Hybrid Devices for Superconducting Quantum Technologies” (http://nanocohybri.eu/) is a European collaboration network, funded under COST Action CA16218.