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tokens: Acknowledgements We acknowledge Cloud Academy I 2018 at the Les Houches School of Physics, France, during which this project was kicked off. We thank Maria Steinrueck for the constructive discussions and contribution. Part of this work was supported by the German Deutsche Forschungsgemeinschaft, DFG project number Ts 17/2–1. We are grateful to the anonymous referee for helpful comments and constructive criticism of the manuscript.