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A quantum spin liquid (QSL) is an exotic quantum ground state that does not break conventional symmetries and where the spins in the system remain dynamic down to zero temperature.Unlike a trivial paramagnetic state,it features long-range quantum entanglement and supports fractionalized excitations.[1] Since Andersons seminal proposal in 1973,[2] QSLs have been vigorously studied both theoretically and experimentally.Frustrated magnets have been the most fruitful playground for the QSL research.[3] These are materials with competing exchange interactions,which typically arise from triangle-based lattices,leading to macroscopic classical ground state degeneracy.This type of frustration is a key ingredient in discovering quantum disordered ground states.