The single-photon transmission spectrum under asymmetrical atom–photon couplings (g1 ≠ g2 and g1 = 0.2) and 2θ = 2π (a), 2θ = π (b), 2θ = 0.4π (d)

Figure 3. The single-photon transmission spectrum under asymmetrical atom–photon couplings (g1 ≠ g2 and g1 = 0.2) and 2θ = 2π (a), 2θ = π (b), 2θ = 0.4π (d). (c) Single-photon switch by controlling the atom–photon couplings and the phase difference between these two separated atoms. The coupling strengths g1 and g2 are in units of Vg.

Abstract

Based on the symmetric, asymmetric atom–photon couplings and the phase difference between two separated atoms, single-photon transport properties in an optical waveguide coupled with two separated two-level atoms are theoretically investigated. The transmission and reflection amplitudes for the single-photon propagation in such a hybrid system are deduced via a real-space approach. Several new phenomena such as phase-coupled induced transparency, single-photon switches, symmetric and asymmetric bifrequency photon attenuators are analyzed. In addition, the dissipation effect of such a hybrid system is also discussed.