AUTHOR=Yan Guo-An , Lu Hua 

TITLE=Realization of Tunable Highly-Efficient Quantum Routing in Chiral Waveguides

JOURNAL=Frontiers in Physics

VOLUME=10

YEAR=2022

URL=https://www.frontiersin.org/journals/physics/articles/10.3389/fphy.2022.880117

DOI=10.3389/fphy.2022.880117

ISSN=2296-424X

ABSTRACT=<p>The chiral interaction between single photons in waveguides and quantum emitters has gained considerable attention. Here, we proposed a tunable quantum routing scheme with a chiral quantum system by coupling an emitter to two chiral waveguides. Conventional quantum routers can only be achieved with each port output probability no larger than 25<italic>%</italic>. But our scheme can transfer quantum information arbitrarily from an input port to another, and each port’s output probability is 100<italic>%</italic>. Besides, we investigated the influence of the Purcell factor in quantum routing properties. No matter how to change the size of the directionalities <italic>S</italic><sub><italic>j</italic></sub> or set a specific value to the dissipation of the emitter, we always found that the quantum routing has very high efficiency. Moreover, we also used a superconducting qubit coupled to two resonators to show the present scheme is pretty feasible for experimental implementation.</p>