# Generation and manipulation of Schr\"odinger cat states in Rydberg atom arrays

## TL;DR

This paper demonstrates the deterministic creation and manipulation of large-scale Schr"odinger cat states in Rydberg atom arrays, advancing quantum information processing and metrology.

## Contribution

It introduces a method to generate and control GHZ-type entangled states of up to 20 qubits in neutral atom arrays using energy spectrum engineering and optimal control.

## Key findings

- Generated up to 20-qubit GHZ states
- Achieved entanglement distribution across the array
- Demonstrated potential for quantum metrology

## Abstract

Quantum entanglement involving coherent superpositions of macroscopically distinct states is among the most striking features of quantum theory, but its realization is challenging, since such states are extremely fragile. Using a programmable quantum simulator based on neutral atom arrays with interactions mediated by Rydberg states, we demonstrate the deterministic generation of 'Schr\"odinger cat' states of the Greenberger-Horne-Zeilinger (GHZ) type with up to 20 qubits. Our approach is based on engineering the energy spectrum and using optimal control of the many-body system. We further demonstrate entanglement manipulation by using GHZ states to distribute entanglement to distant sites in the array, establishing important ingredients for quantum information processing and quantum metrology.