Phonon-assisted Non-reciprocal Studies In NV Color Center Systems

Nonreciprocal optical devices such as optical isolator,optical circulator and optical nonreciprocal amplification are key elements of photon-based quantum network because they can be used to realize the direction-dependent propagation.By utilizing the chiral quantum coherence effects,numerous achievements have been realized such as the high-fidelity optical isolator with unbalanced coupling,nonmagnetic optical isolator and circulator with Doppler shift induced by thermal motion of atoms.Hybrid quantum system consisted with chiral photon crystal waveguide,NV color center provide a good solid-platform for optical nonreciprocal devices.More important,the energy of NV color center can be coupled by phonon,thus the influence of phonon on the devices nearby can be ignored.Therefore,in this thesis,we mainly study the realization of nonreciprocal optical isolation and amplification in the hybrid quantum systems.First,we suggest a hybrid chiral photon crystal waveguide embedded an NV color center,and investigate the quantum control of transmission of single photon by phonon.The degeneracy of energy levels can be shifted by introducing a magnetic field.Consequently,our study demonstrates that the transmission of photon strongly depends upon the direction.Based on the destructive interference induced by phonon,four channels single microwave photon isolator could be realized.Second,a hybrid quantum system consists of a photon crystal waveguide,whispering gallery mode(WGM)microresonantor and NV color center is proposed for nonreciprocal amplification with phonon-assisted second-order nonlinear process.The transmissions are derived by solving the Heisenberg equation.The magnetic is applied to break the time-reversal symmetry by lifting the degeneracy of Zeeman energy levels of NV color center.Our analysis demonstrate,by controlling the coupling strength g and decay rate of microresonantor ?ex,the nonreciprocal amplification of single photon could be achieved.