Experimental Investigation Of Coherent Manipulation In Solid-State Microstructures

Coherent manipulation of quantum-mechanical systems is an important chal-lenge in modern science and engineering, with significant applications in quantum information science and quantum metrology. Solid-state quantum systems such as nitrogen vacancy center, quantum dots, and superconducting devices are among the most promising candidates for realization of practical quantum bits. Mean-while, micro/nano-scale mechanical resonators are of great interest recently be-cause they have small dissipation rates, and are naturally integrated with such solid-state quantum systems by nano-fabrication techniques.The benefit of coupling mechanical resonators to solid-state spins are:(ⅰ)the resonator can be used as a sensitive probe and readout device for the quantum system, (ⅱ)coupling the resonator to a coherent and fully controllable two-level system provides a way to prepare and detect non-classical states of mechanical motion, (ⅲ)the mechanical system can serve as a quantum transducer to mediate interactions between physically quite distinct quantum systems.However, both of these goals have the prerequisite that we be able to Coherent manipulate these system in quantum regime. This thesis presents experimental progress in coherent controlling the nitrogen vacancy center and micro/nano-scale Mechanical resonators, especially the Landau-Zener dynamics, coupled mechanical systems and nonlinear macroscopic resonators. These experimental results provide the potential applications in hybrid quantum information processing.1. Based on single electron spin in diamond, we observed the Rabi oscilla-tions resulting from more than 100 Landau-Zener processes. Our results demonstrate new way to coherent control quantum system in strong driving physics.2. we demonstrate the coherent control in coupled mechanical system, includ-ing the displacement transduction and Rabi Oscillations between them. We also study non-reciprocal transduction in resonators arrays. These results provide new insight in quantum control of mechanical system in future ex-periments.3. we propose and experimentally realize a record-high cubic nonlinear response in a macroscopic mechanical system by exploring the anharmonicity in chem- ical bonding interaction. This enables us to observe the resonator’s vibra-tional bi-states transitions driven by the weak Brownian thermal noise. This method can be used, with further improvements, to explore macroscopic quantum mechanics.