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We experimentally study quantum Zeno effects in a parity-time (PT) symmetriccold atom gas periodically coupled to a reservoir. Based on thestate-of-the-art control of inter-site couplings of atoms in a momentumlattice, we implement a synthetic two-level system with passive PT symmetryover two lattice sites, where an effective dissipation is introduced throughrepeated couplings to the rest of the lattice. Quantum Zeno (anti-Zeno) effectsmanifest in our experiment as the overall dissipation of the two-level systembecoming suppressed (enhanced) with increasing coupling intensity or frequency.We demonstrate that quantum Zeno regimes exist in the broken PT symmetry phase,and are bounded by exceptional points separating the PT symmetric and PT brokenphases, as well as by a discrete set of critical coupling frequencies. Ourexperiment establishes the connection between PT-symmetry-breaking transitionsand quantum Zeno effects, and is extendable to higher dimensions or tointeracting regimes, thanks to the flexible control with atoms in a momentumlattice.

Quantum Zeno effects across a parity-time symmetry breaking transition in atomic momentum space