Anomalous resilient to decoherence macroscopic quantum superpositions generated by universally covariant optimal quantum cloning

TL;DR

This paper demonstrates that quantum states produced by universal optimal quantum cloning are robust against decoherence, maintaining quantum coherence across various polarization states, which has implications for quantum information processing.

Contribution

It introduces a class of quantum superpositions generated by universal cloning that are resilient to decoherence and exhibit covariance in lossy environments.

Findings

Quantum states from universal cloning are resilient to decoherence.

These states maintain coherence across the entire Bloch sphere.

Universal cloning realizes decoherence-resistant quantum superpositions.

Abstract

We show that the quantum states generated by universal optimal quantum cloning of a single photon represent an universal set of quantum superpositions resilient to decoherence. We adopt Bures distance as a tool to investigate the persistence ofquantum coherence of these quantum states. According to this analysis, the process of universal cloning realizes a class of quantum superpositions that exhibits a covariance property in lossy configuration over the complete set of polarization states in the Bloch sphere.