Experimental quantum Zeno effect in NMR with entanglement-based measurement

TL;DR

This paper demonstrates a novel dynamic quantum Zeno effect in NMR systems using entanglement-based measurements, revealing a critical measurement time effect and an entanglement preservation mechanism.

Contribution

It introduces a new dynamic approach to the quantum Zeno effect using entanglement in NMR, highlighting the critical measurement time phenomenon and demonstrating entanglement preservation.

Findings

Quantum Zeno effect depends on measurement time, not just frequency.

Critical measurement times can suppress the Zeno effect.

Entanglement preservation achieved through dynamic measurements.

Abstract

We experimentally demonstrate a new dynamic fashion of quantum Zeno effect in nuclear magnetic resonance systems. The frequent measurements are implemented through quantum entanglement between the target qubit(s) and the measuring qubit, which dynamically results from the unitary evolution of duration $\tau_{m}$ due to dispersive-coupling. Experimental results testify the presence of "the critical measurement time effect", that is, the quantum Zeno effect does not occur when $\tau_{m}$ takes the some critical values, even if the measurements are frequent enough. Moreover, we provide a first experimental demonstration of an entanglement preservation mechanism based on such dynamic quantum Zeno effect.