Photon blockade in non-Hermitian optomechanical systems with nonreciprocal couplings
arxiv(2024)
摘要
We study the photon blockade at exceptional points for a non-Hermitian
optomechanical system coupled to the driven whispering-gallery-mode
microresonator with two nanoparticles under the weak optomechanical coupling
approximation, where exceptional points emerge periodically by controlling the
relative angle of the nanoparticles. We find that conventional photon blockade
occurs at exceptional points for the eigenenergy resonance of the
single-excitation subspace driven by a laser field, and discuss the physical
origin of conventional photon blockade. Under the weak driving condition, we
analyze the influences of the different parameters on conventional photon
blockade. We investigate conventional photon blockade at non-exceptional
points, which exists at two optimal detunings due to the eigenstates in the
single-excitation subspace splitting from one (coalescence) at exceptional
points to two at non-exceptional points. Unconventional photon blockade
can occur at non-exceptional points, while it does not exist at exceptional
points since the destructive quantum interference cannot occur due to the two
different quantum pathways to the two-photon state being not formed. The
realization of photon blockade in our proposal provides a viable and flexible
way for the preparation of single-photon sources in the non-Hermitian
optomechanical system.
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