Microscopic theory of cavity-enhanced single-photon emission from optical two-photon Raman processes

Article

关键词: ELECTROMAGNETICALLY INDUCED TRANSPARENCY;    QUANTUM;    GENERATION;    INTERFERENCE;    SPECTRUM;    LAMBDA;    ATOM;    SPIN;   

DOI  :  10.1103/PhysRevB.97.125303

来源: SCIE

【 摘 要 】

We consider cavity-enhanced single-photon generation from stimulated two-photon Raman processes in three-level systems. We compare four fundamental system configurations, one Lambda-, one V-, and two ladder (Xi-) configurations. These can be realized as subsystems of a single quantum dot or of quantum-dot molecules. For a new microscopic understanding of the Raman process, we analyze the Heisenberg equation of motion applying the cluster-expansion scheme. Within this formalism an exact and rigorous definition of a cavity-enhanced Raman photon via its corresponding Raman correlation is possible. This definition for example enables us to systematically investigate the on-demand potential of Raman-transition-based single-photon sources. The four system arrangements can be divided into two subclasses, Lambda-type and V-type, which exhibit strongly different Raman-emission characteristics and Raman-emission probabilities. Moreover, our approach reveals whether the Raman path generates a single photon or just induces destructive quantum interference with other excitation paths. Based on our findings and as a first application, we gain a more detailed understanding of experimental data from the literature. Our analysis and results are also transferable to the case of atomic three-level-resonator systems and can be extended to more complicated multilevel schemes.

【 授权许可】

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