Preparation and study of the entanglement of the Schr\"odinger cat state on the ibmq-melbourne quantum computer

TL;DR

This paper investigates the entanglement properties of Schr"odinger cat states on the ibmq-melbourne quantum computer, analyzing how entanglement varies with state parameters and system size using spin measurements.

Contribution

It introduces a protocol based on spin mean values to study entanglement in multi-qubit Schr"odinger cat states on a real quantum device.

Findings

Entanglement depends on the cat state parameter.

Entanglement varies with the number of qubits.

Maximum entanglement observed in specific states.

Abstract

We study the entanglement between a certain qubit and the remaining system in the Schr\"odinger cat state prepared on the ibmq-melbourne quantum computer. The protocol, which we use for this purpose, is based on the determination of the mean value of spin corresponding to a certain qubit. We explore the dependence of the entanglement on a parameter of the Schr\"odinger cat state which consists of different numbers of qubits. In addition, we explore the entanglement of each qubit with the remaining system in the maximum entangled Schr\"odinger cat state.