Decoherence, Einselection and Classicality of a Macroscopic Quantum Superposition generated by Quantum Cloning

TL;DR

This paper investigates the decoherence resistance of a macroscopic quantum superposition generated by quantum cloning, comparing it with other MQS types and analyzing its classicality through the lens of decoherence theory.

Contribution

It provides a theoretical and numerical analysis of a novel MQS generated by quantum cloning, highlighting its enhanced resilience to decoherence and applying decoherence concepts to understand its classicality.

Findings

The MQS shows high resilience to decoherence compared to traditional states.

Comparison with coherent and NOON states reveals unique properties of the cloned MQS.

Application of Zurek's theory offers insights into the classicality emergence of the MQS.

Abstract

The high resilience to de-coherence shown by a recently discovered Macroscopic Quantum Superposition (MQS) generated by a quantum injected optical parametric amplifier (QI-OPA) and involving a number of photons in excess of 5x10^4 motivates the present theoretical and numerical investigation. The results are analyzed in comparison with the properties of the MQS based on coherent states and NOON states, in the perspective of the comprehensive theory of the subject by W.H.Zurek. In that perspective the concepts of "pointer state", "einselection" are applied to the new scheme.