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Within the last decade, experimentalists have demonstrated their impressiveability to control mechanical modes within mesoscopic objects down to thequantum level: it is now possible to create mechanical Fock states, to entanglemechanical modes from distinct objects, store quantum information or transferit from one quantum bit to another, among the many possibilities found intoday's literature. Indeed mechanics is quantum, very much like spins orelectromagnetic degrees of freedom. And all of this is in particular referredto as a new engineering resource for quantum technologies. But there is alsomuch more beyond this utilitarian aspect: invoking the original discussions ofBraginsky and Caves where a quantum oscillator is thought of as a quantumdetector for a classical field, namely a gravitational wave, it is also aunique sensing capability for quantum fields. The subject of study is then thebaths to which the mechanical mode is coupled to, let them be known or unknownin nature. This Letter is about this new potentiality, that addressesstochastic thermodynamics, potentially down to its quantum version, the searchfor a fundamental underlying (random) field postulated in recent theories thatcan be affiliated to the class of the Wave-function Collapse models, and moregenerally open questions of Condensed Matter like the actual nature of theelusive (and ubiquitous) Two-Level Systems present within all mechanicalobjects. But such research turns out to be much more demanding than the usageof a few quantum mechanical modes: all the known baths have to be identified,experiments have to be conducted in-equilibrium, and the word "mechanics" needsto be justified by a real ability to move substantially the centre-of-mass whena proper drive tone is applied to the system.

Mesoscopic Quantum Thermo-mechanics: a new frontier of experimental physics