In recent years the development of cavity otomechanical coupling has enabled to achieve the quantum regime of mechanical systems in an experimental setting. The present proposal building on these developments and demonstrate mechanical oscillators ability as a quantum technology. It seeks to investigate and utilize coherent coupling of ground state cooled mechanical oscillators for storage of single photons in mechanical oscillators, explore backaction evading measurements, explore quantum dissipation due to two level systems, demonstrate novel transducers and explore an microwave to optical quantum link based on effective optomechanical interactions. The applicant has laid the basis for these objectives within the framework of an ERC Starting Grant (call 2007) that demonstated the methods to achieve the quantum regime of mechanical oscillator. The present proposal seeks to use the ERC Advanced Grant to directly build on the advances of this project.