| Hybrid quantum systems were evaluated as ”that will fuel quantum science for decades to come” by the American Physical Review,which can not only be used to reveal more novel quantum effects but also can be used to build a variety of new artificial quantum devices,combining the unique advantages of different physical systems,such as electro-to-optical quantum state converter,the coupling system of a microscopic quantum system(quantum dot,spin,cold atom,superconducting quantum bit,etc.)and macroscopic system(mechanical oscillator,etc.),opto-magnetomechanics hybrid system and magnetometer,levitated optomechanics system and quantum sensing device,etc.In this thesis,special attention is paid to the hybrid quantum system of cavity optomechanical,which was named as one of the 23 milestones in the history of optical development by the British journal Nature.Both the 2017 and 2018 Nobel Prizes in physics were for work based on cavity optomechanical system.We note that this research is gradually being combined with exceptional points(EPs)physics to form non-Hermitic hybrid quantum systems.The so-called EPs point refers to the combination of two or more eigenmodes in a quantum system,which is accompanied by many abnormal effects,such as unidirectional laser and non-reciprocal transmission,perfect absorption and invisible sensing,topological energy transfer and long-range wireless transmission,enhanced optical sensing sensitivity,and so on.Under this background,this paper studies the optical transmission and phonon control based on the cavity opto-magnetomechanics system.To be specific,the main innovation results of this thesis are as follows:(1)Based on a single optical cavity coupling two mechanical resonators system,we focus on the role of selective mechanical pump in electromagnetically induced transparency.We found that by selectively driving mechanical oscillators,the coupling between the light field in the cavity and different mechanical resonators would be selectively enhanced or weakened,thus affecting the output spectrum of electromagnetically induced transparency and the transmission rateof the probe light,second-order sideband effect,and slow light effect.These results not only on the cavity optomechanical system with two mechanical resonators for optical signal control and laser communication has direct practical value,and,from a broader perspective,the use of mechanical control to regulate and enhance the mechanical-electric coupling,magnetic coupling,coupled quantum dots of different hybrid quantum systems bring new means.(2)We study EP-assisted electromagnetically induced transparency in a hybrid cavity opto-magnetomechanics system.As recently observed in experiments,coherent coupling or dissipative magnon-photon can be realized by changing the yttrium iron garnet sphere(YIG)location.In contrast to coherent coupling that leads to level repulsion between hybridized modes,dissipative coupling results in level attraction.In particular,exceptional-points emerge by the field detuning of the cavity and magnon.Through analytical calculation and numerical analysis,we find that by approaching the EPs,optical transmissions through the optomagnetomechanics system can be significantly modified,which is accompanied by the slow-to-fast light transition.(3)We study EP-assisted electromagnetically induced transparency in a hybrid cavity opto-magnetomechanics system.As recently observed in experiments,coherent coupling or dissipative magnon-photon can be realized by changing the YIG sphere location.In contrast to coherent coupling that leads to level repulsion between hybridized modes,dissipative coupling results in level attraction.In particular,exceptional-points emerge by the field detuning of the cavity and magnon.Through analytical calculation and numerical analysis,we find that by approaching the EPs,optical transmissions through the opto-magnetomechanics system can be significantly modified,which is accompanied by the slow-to-fast light transition. |
PDF Full Text Request