Acknowledgements
We thank Erik Woodhead for pointing out equation (12) and Flavien Hirsch for inspiring pre-
liminary discussions. We also thank Daniel Cavalcanti, Florian Curchod, Dr. Bibounde, Antonio
Acin, Remigiusz Augusiak, Marco Tulio Quintino and Peter Wittek for discussions throughout the
project.
All authors acknowledge funding from the Spanish MINECO (QIBEQI FIS2016-80773-P, Severo
Ochoa SEV-2015-0522, a Severo Ochoa PhD fellowship), Fundacio Cellex, Generalitat de Catalunya
(SGR 1381 and CERCA Programme). JB acknowldges funding from the AXA Chair in Quan-
tum Information Science, Juan de la Cierva-formación and the EU Quantum Flagship project
QRANGE. FB acknowledges the support from the Deutsche Forschungsgemeinschaft (DFG, Ger-
man Research Foundation) - Project number 414325145 in the framework of the Austrian Science
Fund (FWF): SFB F71.
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Accepted in Quantum 2010-10-02, click title to verify. Published under CC-BY 4.0. 11