Noise-induced distributed entanglement in atom-cavity-fiber system

TL;DR

This paper proposes methods to generate steady entanglement between distant atoms in an atom-cavity-fiber system using dissipation, quantum Zeno dynamics, and feedback control, enhancing quantum network capabilities.

Contribution

It introduces two novel schemes that utilize dissipation as a resource and do not require precise parameter tuning for entanglement generation in atom-cavity-fiber systems.

Findings

High-fidelity entanglement achievable with current experimental parameters.

Dissipation and fiber loss are actively used as resources.

Schemes scalable to multi-cavity systems.

Abstract

The distributed quantum computation plays an important role in large-scale quantum information processing. In the atom-cavity-fiber system, we put forward two efficient proposals to prepare the steady entanglement of two distant atoms with dissipation. The atomic spontaneous emission and the loss of fiber are exploited actively as powerful resources, while the effect of cavity decay is inhibited by quantum Zeno dynamics and quantum-jump-based feedback control. These proposals do not require precisely tailored Rabi frequencies or coupling strength between cavity and fiber. Furthermore, we discuss the feasibility of extending the present schemes into the systems consisting of two atoms at the opposite ends of the $n$ cavities connected by $(n-1)$ fibers, and the corresponding numerical simulation reveals that a high fidelity remains achievable with current experimental parameters.