Two-Photon Routing in Many-Emitter Chiral Waveguide Quantum Electrodynamics

In this poster, we present a routing scheme to direct the transport of two photons in a multi-emitter chiral waveguide quantum electrodynamics ladder. At the level of single photons, this problem has been studied both for a single three-level atom case and for multiple two-level atoms (see for example, Phys. Rev. Research 2 (4), 043048, 2020; and Phys. Rev. A 94, 063817, 2016) and it is known that the routing probability drastically reduces in the presence of dissipation effects (such as spontaneous emission from the atoms). In this study, we utilize the interplay between the chiral photon emissions and the collective effects originating from the presence of a one-dimensional chain of two-level atoms to combat the environmental losses to sustain considerably large routing probabilities. Furthermore, with the presence of two photons, we also investigate how the phenomena of bunching and antibunching can help us in the routing process. Since realistic quantum networks must be able to handle vast amounts of information. Therefore studying the problem of two photons and which parameters can be controlled to increase the likelihood of routing is important in developing more reliable long-distance quantum communication protocols.