Author Affiliations

H. B. Coldenstrodt-Ronge,^1,* A. P. Worsley,¹ J. S. Lundeen,^1,2 A. Feito,^3,4 K. L. Pregnell,^3,4 Ch. Silberhorn,⁵ P. J. Mosley,^1,5 B. J. Smith,¹ G. Puentes,¹ N. Thomas-Peter,¹ T. C. Ralph,⁶ J. Eisert,^3,4 M. B. Plenio,^3,4 and I. A. Walmsley¹

¹Clarendon Laboratory, University of Oxford, Oxford, 0X1 3PU, UK

²Institute for National Measurement Standards, Ottawa, ON, Canada K1A 0R6

³Institute for Mathematical Sciences, Imperial College London, SW7 2PE, UK

⁴QOLS, The Blackett Laboratory, Imperial College London, Prince Consort Rd., SW7 2BW, UK

⁵Max-Planck Research Group, 91058 Erlangen, Germany

⁶Department of Physics, University of Queensland, Brisbane, QLD 4072, Australia

^*Corresponding author: h.coldenstrodt-ronge1@physics.ox.ac.uk