The Interference Of Single-photon And Atomic Ground State Excitation

Optical communication is a very advantageous means compared with other communication means such as wireless communication.Optical communication has unparalleled advantages such as large communication capacity,small signal attenuation and good confidentiality.The biggest advantage of quantum communication is the most security compared with traditional optical communication.Quantum communication is a new type of confidential communication method with development potential,which is of great significance to national security and other aspects.In quantum communication,single-photon is the smallest photon unit in the number of photons,and single photon can load polarization and other information.Therefore,in quantum communication,single-photon becomes an important communication carrier.The research on single-photon has made great progress in recent years.The study of magneton has been uninterrupted since ancient times.Until now,the research on magneton is still an important topic.The atomic spin wave as a kind of magneton and its study helps people discover the nature of magneton.Because atomic spin waves are also a type of magneton.Through the interference of single photon and single atom spin wave,we help to understand the interaction between light and magnetism and the essence of both.In the non-Hermitian optical beam splitter that formed by the cold atom system,by adjusting the detuning of the coupling light and probe light or anti-stokes photon frequency,the interference of light and atomic spin waves in different situations is achieved.In experiments using coherent light to simulate single photons,we implemented the interference between simulated single photons and single atom spin waves by controlling the relative phase of incident light and the intrinsic phase of the optical fractionator,we carried out the control of optical beam splitting.The relative phase control of the output end of the device realizes the regulation from HOM depression to protrusion.We found that by controlling the relative phase of the injected light,HOM interference reaches the so-called quantum level,which provides an idea and reference for further research on quantum communication and quantum effects using phase control of coherent light levels.In the real single-photon and single-atom spin wave interference experiment,using two sets of cold atom systems trapped by the magneto-optical,we realized the real single-photon and single-atom spin wave interference.Atomic spin wave interference not only has bunching effect,but also has anti-bunching effect.This is of great significance for the study of single photon and single magneton.