Multi-Transparency Windows and Fano interference Induced by Dipole-Dipole Couplings

摘要

We investigate the optical properties of a two-level system (TLS) coupled toa linear series of $N$ other TLS's with dipole-dipole coupling between thefirst neighbours. The first TLS is probed by weak field and we assume that ithas a decay rate much stronger than the decay rates of the other TLS's. For N=1and in the limit of a probe field much weaker than the dipole-dipole coupling,the optical response of the first TLS, i.e., its absorption and dispersion, areequivalent to those of a three-level atomic system in the configuration whichallow one to observe electromagnetically induced transparency (EIT) phenomenon.Thus, here we are investigating a new kind of induced transparency where thedipole-dipole coupling plays the same role of the control field in EIT inthree-level atoms. We describe this physical phenomenon, here named asDipole-Dipole Induced Transparency (DDIT), and investigate how it scales withthe number of coupled TLS's. In particular we have shown that the number ofTLS's coupled to the main one is exactly equals to the number of transparencywindows. The ideas presented here are very general and can be implemented indifferent physical systems such as array of superconducting qubits, array ofquantum dots, spin chains, optical lattices, etc.