Deterministic generation of multiparticle entanglement by quantum Zeno dynamics

TL;DR

This paper demonstrates a fast, deterministic method for generating multiparticle entangled states using quantum Zeno dynamics with optical microcavity measurements, advancing quantum state engineering.

Contribution

It introduces a novel application of quantum Zeno dynamics for rapid entanglement generation in a large atomic ensemble, with detailed characterization and analysis.

Findings

Generated entangled states in less than 5 microseconds

Quantum tomography confirmed high-fidelity entanglement

Entanglement depth depends on measurement strength

Abstract

Multiparticle entangled quantum states, a key resource in quantum-enhanced metrology and computing, are usually generated by coherent operations exclusively. However, unusual forms of quantum dynamics can be obtained when environment coupling is used as part of the state generation. In this work, we used quantum Zeno dynamics (QZD), based on nondestructive measurement with an optical microcavity, to deterministically generate different multiparticle entangled states in an ensemble of 36 qubit atoms in less than 5 microseconds. We characterized the resulting states by performing quantum tomography, yielding a time-resolved account of the entanglement generation. In addition, we studied the dependence of quantum states on measurement strength and quantified the depth of entanglement. Our results show that QZD is a versatile tool for fast and deterministic entanglement generation in quantum engineering applications.