Interference-induced directional emission from an unpolarized two level
emitter into a circulating cavity
- URL: http://arxiv.org/abs/2109.09332v1
- Date: Mon, 20 Sep 2021 07:21:43 GMT
- Title: Interference-induced directional emission from an unpolarized two level
emitter into a circulating cavity
- Authors: Lucas Ostrowski, Scott Parkins, Morito Shirane and Mark Sadgrove
- Abstract summary: Chiral coupling between quantum emitters and evanescent fields allows directional emission into nanophotonic devices.
Here, we demonstrate that a two level emitter with a randomly polarized dipole moment can be made to emit directionally into a circulating cavity.
- Score: 0.0
- License: http://creativecommons.org/licenses/by/4.0/
- Abstract: Chiral coupling between quantum emitters and evanescent fields allows
directional emission into nanophotonic devices and is now considered to be a
vital ingredient for the realization of quantum networks. However, such
coupling requires a well defined circular dipole moment for the emitter --
something difficult to achieve for solid state emitters at room temperature due
to thermal population of available spin states. Here, we demonstrate that a two
level emitter with a randomly polarized dipole moment can be made to emit
directionally into a circulating cavity if a separate emitter is chirally
coupled to the same cavity, for the case when both emitter-cavity couplings are
strong but in the bad-cavity regime. Our analysis of this system first
considers a transient scenario, which highlights the physical mechanism giving
rise to the directional emission of the two level emitter into the cavity. An
alternative setup involving a weak laser field continuously driving the system
is also considered, where the directionality (our proposed figure of merit for
this scheme) is shown to be significantly more robust against noise processes.
The results presented here take the form of approximate analytical expressions
backed by complete numerical simulations of the system.
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