Cooling atoms into entangled states

TL;DR

This paper explores a method to generate highly entangled atomic states by cooling atoms into the ground state of an interaction Hamiltonian, leveraging laser detuning and spontaneous emission for high-fidelity state preparation.

Contribution

It introduces a novel cooling-based approach for preparing entangled states, applicable to one and two qubits, with high fidelity across various conditions.

Findings

High-fidelity entangled state preparation demonstrated

Method effective for a range of experimental parameters

Applicable to both single and two-qubit systems

Abstract

We discuss the possibility of preparing highly entangled states by simply cooling atoms into the ground state of an applied interaction Hamiltonian. As in laser sideband cooling, we take advantage of a relatively large detuning of the desired state, while all other qubit states experience resonant laser driving. Once spontaneous emission from excited atomic states prepares the system in its ground state, it remains there with a very high fidelity for a wide range of experimental parameters and all possible initial states. After presenting the general theory, we discuss concrete applications with one and two qubits.