Conditional Dynamics of Optomechanical Two-Tone Backaction-Evading Measurements

D. M. acknowledges support by the Horizon 2020 ERC Advanced Grant QUENOCOBA (grant agreement 742102). A. N. acknowledges a University Research Fellowship from the Royal Society and additional support from the Winton Programme for the Physics of Sustainability. This work was supported by the European Unions Horizon 2020 research and innovation programme under grant agreement No 732894 (FET Proactive HOT).