  Distant interactions at arbitrary locations and their dynamic control are
fundamentally important for realizing large-scale photonic and quantum
circuits. Conventional approaches suffer from short coupling distance, poor
controllability, fixed locations and low wavelength uniformity, significantly
restricting the scalability of photonic and quantum networks. Here, we exploit
the intrinsic advantages of optical bound state in the continuum (BIC) and
demonstrate an all-in-one solution for dynamically controllable long-range
interactions. BIC metasurface can support a series of finite-sized quasi-BIC
microlasers at arbitrary locations. The quasi-BICs microlasers have the same
wavelength and are inherently connected through BIC waveguide. Consequently,
the coupling distances in experiment increase significantly from subwavelength
to tens of micrometers. Such long-range interaction in BIC metasurface enables
scaling to two-dimensional architectures and ultrafast control of internal
laser actions, e.g., non-Hermitian zero-mode lasing and enhanced optical gain.
This research shall facilitate the advancement of scalable and reconfigurable
photonic networks.
