Abstract
Abstract
We here study a hybrid quantum system of one solid-state electronic spin coupled to a mechanical resonator (MR) using the crystal strain, with the purpose of engineering the mesoscopic spin-phonon entangled cat state. The feature of this work to be mentioned is that it proposes a different and feasible method to achieve the entanglement, especially with the higher fidelity. This scheme mainly contains two steps, namely the coherent population trapping (CPT) initialization and large-detuning evolution (LDE). By taking all of the adverse decoherence factors into our considerations, the numerical simulations indicate that its fidelity can reach more than 0.995 (or 0.999) when the spin-mechanical coupling strength is 10 (or 100) times larger than spin dephasing and mechanical resonator dissipation rate, respectively. Because of the cooperation of CPT and LDE, this proposal also exhibits a considerable robustness for engineering the entangled cat state, and which may be considered as a general attempt that may be suitable for different systems.
Funder
China Postdoctoral Science Foundation
Hubei Provincial Department of Education
Doctoral Scientific Research Foundation of Hubei University of Automotive Technology
Foundation of Discipline Innovation Team of HUAT
Natural Science Foundation of Shandong Province
Natural Science Foundation of Hubei Province
Hubei University of Automotive Technology
Program for Science and Technology Innovation Team in Colleges of Hubei Province
Natural National Science Foundation
Subject
Condensed Matter Physics,Mathematical Physics,Atomic and Molecular Physics, and Optics