Controllable entanglement preparations between atoms in spatially-separated cavities via quantum Zeno dynamics

Area of Science:

• Quantum Information Science
• Atomic Physics
• Quantum Optics

Background:

• Generating multi-atom entanglement is crucial for quantum information processing.
• Existing methods often face challenges with determinism and robustness against decoherence.

Purpose of the Study:

• To propose a controllable and deterministic method for generating tripartite Greenberger-Horne-Zeilinger (GHZ) states.
• To establish Einstein-Podolsky-Rosen (EPR) entanglement between distant atoms.
• To demonstrate the robustness of the proposed scheme against various decoherence sources.

Main Methods:

• Utilizing quantum Zeno dynamics for controlled state generation.
• Employing three atoms trapped in spatially separated, fiber-connected cavities.
• Applying tunable classical drivings to atoms at the ends of the system.
• Performing Von Neumann measurement on the central atom to achieve EPR entanglement.

Main Results:

• Deterministic generation of tripartite GHZ states in a single manipulation step.
• Achieving deterministic EPR entanglement between the end atoms via measurement.
• Demonstrating controllable duration of quantum Zeno dynamics, halting state evolution.
• Numerical validation of robustness against atomic spontaneous emissions, cavity decays, and fiber photon leakages.

Conclusions:

• The proposed quantum Zeno dynamics approach offers a robust and controllable method for tripartite GHZ state generation.
• The scheme is extendable to generate larger-scale multipartite entanglement.
• This work provides a promising avenue for building scalable quantum networks and processors.