Sensitive enough to detect a change in the relative length of two 4km-long arms equivalent to less than 1/10,000th the width of a proton. And we distinguish si

Sensitive enough to detect a change in the relative length of two 4km-long arms equivalent to less than 1/10,000th the width of a proton. And we distinguish signals from noise via a few different approaches, but our flagship search relies on matched filtering against simulated waveforms, and requiring the same signal to be coincident in time across multiple, geographically-distant detectors for which very few noise sources are correlated.