Prototype differential atom interferometer cancels noise for gravitational wave and dark matter detection

A prototype differential atom interferometer has successfully demonstrated noise cancellation crucial for detecting gravitational waves and ultralight dark matter. The experiment achieved standard quantum limit performance, showing no excess noise beyond atom shot noise. It maintained quantum-limited sensitivity even with significant artificial laser phase noise, emulating conditions for future long-baseline detectors. This breakthrough validates a key noise-immune measurement principle for next-generation quantum sensors, paving the way for enhanced searches for gravitational waves and dark matter.