Composite single quantum system with adjustable radiation dipole polarization state

The invention belongs to the technical field of single quantum system regulation and control, and discloses a composite single quantum system with an adjustable radiation dipole polarization state. The composite single quantum system comprises a single quantum radiator and a nano optical antenna; the nano optical antenna is formed by two nanorods in end-to-end clearance fit; the axes of the two nanorods are positioned in the same plane and form a certain included angle; the single quantum radiator is located in a nanometer gap formed by the end-to-end clearance fit of the two nanorods; any circular polarization adjustment of the radiation dipole of the composite single quantum system between + 1 and-1 is realized by adjusting the included angle between the axes of the two nanorods. The polarization state of the radiation dipole can be flexibly regulated and controlled among linear polarization, elliptical polarization and circular polarization, the radiation dipole moment can be remarkably amplified by utiliz