Coherent field-controlled single-photon transmission in the atom-cavity-waveguide coupled system

Abstract

Starting from the semiclassical theory of light-matter interaction, we have theoretically investigated the substantial influences of two coherent driving fields on manipulating the single-photon transmission probability in the extensively studied atom-cavity-waveguide coupled system. The results strictly demonstrate that under the relatively large photon-cavity detuning and moderately strong driving fields, the single-photon transmission probability increases remarkably from the original 0 to 1 by controlling the coherent fields in the nondissipative environment, which manifests the manipulation of the coherent fields as a sort of highly controllable external tool to efficiently act as an experimentally available all-optical quantum switching. In contrast, the behavior independent from variation of coherent fields and characterized by the stationary transmission spectrum appears under the photon-atom on-resonance condition. Similar properties can also be observed in the dissipative environment. These distinct characteristics essentially reveal some significant functionalities of coherent field control in influencing the single-photon transmission spectrum, which may have potential applications in designing efficient photonic devices.

Achieving nonreciprocal unidirectional single-photon quantum transport using the photonic Aharonov–Bohm effect

“…We show that a single-photon effective gauge field can be created in this system, which can lead to a photonic Aharonov-Bohm effect and nonreciprocal unidirectional transport for single photons. Moreover, in the atom-waveguide system, the atom can induce strong photon-photon interaction at the two-photon level [17][18][19][20][21][22]. Our work points to a route of combining few-photon nonlinearity with a photonic gauge field.…”

All-optical switch and transistor based on coherent light-controlled single two-level atom coupling with two nanowires*

“…In previous incoherent light-controlled schemes, [21][22][23][24][25][26][27] bulk materials or optical resonators were excited by strong light to change their dielectric coefficients to control the transmission of weak signals, or multi-level atoms are strongly excited by the gate photons to initialize atoms in some special superposition to generate light controlling. These constructions are so complicated that a dedicated atomic energy structure is needed, and their nonlinearities are only generated by controlling light beams.…”

“…In this work, we introduce a method of light-controlledlight by a single two-level emitter since light-controlled-light is one of the core technologies of an all-optical network. [19] The potential for optical devices in direct manipulating light remains unfulfilled due to lack of bulk materials with fast strong optical nonlinearities, [20,21] causing most of schemes of light-controlled-light at present to need a strong light serving as the controlling light for prefabricating the optical medium into some specific initiation. [22][23][24][25][26] In order to keep the medium in such an initial state all the time, the working light or signal should be much weaker than the controlling light, such as electromagnetically induced transparency (EIT) in which strong light turns the medium state into dark state and makes a weak resonant signal change from opaque to transparent.…”