One-Way Deficit of Two Qubit X States

TL;DR

This paper introduces a new method to evaluate the one-way quantum deficit for two-qubit X states, analyzing its robustness under decoherence and its relation to quantum correlations and thermodynamics.

Contribution

It proposes a novel approach to compute the one-way deficit for a specific class of two-qubit states and studies its behavior under decoherence.

Findings

One-way deficit of X states with five parameters is more robust than entanglement under decoherence.

The new evaluation method provides insights into quantum thermodynamics and non-locality.

The study links quantum correlations with thermodynamic properties in quantum systems.

Abstract

Quantum deficit originates in questions regarding work extraction from quantum systems coupled to a heat bath [Phys. Rev. Lett. 89, 180402 (2002)]. It links quantum correlations with quantum thermodynamics and provides a new standpoint for understanding quantum non-locality. In this paper, we propose a new method to evaluate the one-way deficit for a class of two-qubit states. The dynamic behavior of the one-way deficit under decoherence channel is investigated and it is shown that the one-way deficit of the X states with five parameters is more robust against the decoherence than the entanglement.