Experimental realization of quantum zeno dynamics
Florian Sch\"afer, Ivan Herrera, Shahid Cherukattil, Cosimo Lovecchio,, Francesco Saverio Cataliotti, Filippo Caruso, Augusto Smerzi

TL;DR
This paper experimentally demonstrates quantum Zeno dynamics using a rubidium Bose-Einstein condensate, showing how measurements and strong couplings can control quantum evolution within a multi-level system.
Contribution
It provides the first experimental realization of quantum Zeno dynamics in a Bose-Einstein condensate, illustrating control over quantum state evolution via measurement-induced effects.
Findings
Quantum Zeno dynamics can be realized in a five-level Bose-Einstein condensate.
Measurements and strong couplings can dynamically disconnect quantum states.
Atoms are constrained to evolve coherently within a two-level subspace.
Abstract
It is generally impossible to probe a quantum system without disturbing it. However, it is possible to exploit the back-action of quantum measurements and strong couplings to tailor and protect the coherent evolution of a quantum system. This is a profound and counterintuitive phenomenon known as quantum Zeno dynamics (QZD). Here we demonstrate QZD with a rubidium Bose-Einstein condensate in a five-level Hilbert space. We harness measurements and strong couplings to dynamically disconnect different groups of quantum states and constrain the atoms to coherently evolve inside a two-level subregion. In parallel to the foundational importance due to the realization of a dynamical superselection rule and the theory of quantum measurements, this is an important step forward in protecting and controlling quantum dynamics and, broadly speaking, quantum information processing.
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