Quantum properties of the motional degrees of freedom of mechanical systems is an outstanding challenge in physics nowadays. At the Physics of Quantum Devices Laboratory we develop new technologies to study quantum mechanical properties of hybrid electromechanical quantum devices to measure the energy eigenstates of nanomechanical resonator and entangled states of mechanical resonator and qubits. These studies open the possibility to explore how the classical world emerges from the quantum world, as well as other fundamental aspects of quantum behavior which are important for quantum information, decoherence, entanglement, nonlocality and in technologies for quantum computation, information processing, materials imaging, sensing of weak signals, and details of energy transport and the n