= John J. Bollinger
{c}
{tag=Physicist}
= J. J. Bollinger
{c}
{synonym}
An experimental <atomic physicist> who coauthored the <beryllium-ion quantum Zeno experiment of 1990>. Its <Penning trap> isolated laser-cooled <ions>; state-dependent scattering of <photons> distinguished the two <hyperfine levels>. Repeated probes suppressed a driven transition even when a particular probe detected no scattered <photons>, illustrating the information carried by a null measurement.<Quantum Zeno effect by Wayne M. Itano, Daniel J. Heinzen, John J. Bollinger and David J. Wineland>[Abstract: optical probes and null-measurement case]{ref}
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