# Deterministic nonclassicality for quantum mechanical oscillators in thermal states

## TL;DR

This paper demonstrates a deterministic method to generate nonclassical states in quantum harmonic oscillators initially in thermal states by coupling them to a two-level system, resilient to noise and effective even in high-temperature regimes.

## Contribution

It introduces a novel, noise-resilient technique for creating nonclassical states in thermal quantum oscillators via coupling to a two-level system.

## Key findings

- Nonclassical states can be deterministically generated from thermal states.
- The method is effective even in the absorption regime with the two-level system in the ground state.
- Higher thermal energy enhances nonclassicality production.

## Abstract

Quantum nonclassicality is the basic building stone for the vast majority of quantum information applications and methods of its generation are at the forefront of research. One of the obstacles any method needs to clear is the looming presence of decohorence and noise which act against the nonclassicality and often erase it completely. In this paper we show that nonclassical states of a quantum harmonic oscillators initially in thermal equilibrium states can be deterministically created by coupling it to a single two level system. This can be achieved even in the absorption regime in which the two level system is initially in the ground state. The method is resilient to noise and it may actually benefit from it, as witnessed by the systems with higher thermal energy producing more nonclassical states.