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Wave function collapse models postulate a fundamental breakdown of thequantum superposition principle at the macroscale. Therefore, experimentaltests of collapse models are also fundamental tests of quantum mechanics. Here,we compute the upper bounds on the collapse parameters, which can be inferredby the gravitational wave detectors LIGO, LISA Pathfinder, and AURIGA. Weconsider the most widely used collapse model, the continuous spontaneouslocalization (CSL) model. We show that these experiments exclude a huge portionof the CSL parameter space, the strongest bound being set by the recentlylaunched space mission LISA Pathfinder. We also rule out a proposal forquantum-gravity-induced decoherence.

Experimental bounds on collapse models from gravitational wave detectors