Experimental Realization of Quantum Darwinism State on Quantum Computers

TL;DR

This paper demonstrates the experimental realization of quantum Darwinism states on quantum computers, showing how quantum systems evolve to classical states through environment interactions, using multi-qubit circuits on IBM quantum devices.

Contribution

It provides the first experimental implementation of quantum Darwinism states on real quantum hardware, validating theoretical models of decoherence and classicality emergence.

Findings

Successful realization of Darwinism states on IBM quantum devices

Analysis of quantum-classical correlations and mutual information

Evidence supporting decoherence theory in quantum-to-classical transition

Abstract

It is well-known that decoherence is a crucial barrier in realizing various quantum information processing tasks; on the other hand, it plays a pivotal role in explaining how a quantum system's fragile state leads to the robust classical state. Zurek [Nat. Phys. 5, 181-188 (2009)] has developed the theory which successfully describes the emergence of classical objectivity of quantum system via decoherence, introduced by the environment. Here, we consider two systems for a model universe, in which the first system shows a random quantum state, and the other represents the environment. We take 2-, 3-, 4-, 5- and 6-qubit quantum circuits, where the system consists of one qubit and the rest qubits represent the environment qubits. We experimentally realize the Darwinism state constructed by this system's ensemble on two real devices, ibmq_athens and ibmq_16_melbourne. We then use the results to investigate quantum-classical correlation and the mutual information present between the system and the environment.