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Quantum mechanics predicts that our physical reality is influenced by eventsthat can potentially happen but factually do not occur. Interaction-freemeasurements (IFMs) exploit this counterintuitive influence to detect thepresence of an object without requiring any interaction with it. Here wepropose and realize an IFM concept based on an unstable many-particle system.In our experiments, we employ an ultracold gas in an unstable spinconfiguration which can undergo a rapid decay. The object - realized by a laserbeam - prevents this decay due to the indirect quantum Zeno effect and thus,its presence can be detected without interacting with a single atom. Contraryto existing proposals, our IFM does not require single-particle sources and isonly weakly affected by losses and decoherence. We demonstrate confidencelevels of 90%, well beyond previous optical experiments.

Interaction-free measurements by quantum Zeno stabilisation of ultracold atoms