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A theoretical investigation of the macroscopic quantum coherence in a whispering‐gallery‐mode optical microresonator is conducted, where clockwise (CW) and counterclockwise (CCW) propagating modes are coupled in nonreciprocal non‐Hermitian manner induced by nanoparticles. The results indicate that the dynamic control of quantum coherence/intercoherence can be realized by adjusting relative phase angle...
Conventionally, dynamical encirclement of exceptional points in non‐Hermitian systems is known to manifest a counterintuitive chiral state conversion. However, the prerequisite of such traits enclosing an exceptional point is broken when only encircling its proximity, preserving a still chiral switching. Research on the proximity‐encirclement in multistate systems is lacking. In this paper, a photonic‐waveguide‐array...