A chiral one-dimensional atom using a quantum dot in an open microcavity

Abstract In a chiral one-dimensional atom, photon propagating in one direction interacts with the atom; other does not. Chiral quantum optics has applications creating nanoscopic single-photon routers, circulators, phase-shifters, and two-photon gates. Here, we implement using low-noise dot an open microcavity. We demonstrate non-reciprocal absorption of single photons, diode. The non-reciprocity, ratio transmission forward-direction to reverse direction, is as high 10.7 dB. This achieved by tuning photon-emitter coupling situ optimal operating condition ( β = 0.5). Proof that non-reciprocity arises from emitter lies statistics—ultralow-power laser light diode’s results highly bunched output g (2) (0) 101), showing component largely removed.