# Quantum entanglement and quantum discord in dimers in multiple quantum NMR experiments

## TL;DR

This paper investigates quantum correlations, including entanglement and discord, in two-spin dimers during multiple quantum NMR experiments, revealing the emergence of specific coherences and quantum states.

## Contribution

It provides a detailed analysis of MQ NMR dynamics in dimers, highlighting the appearance of entangled states and calculating quantum discord at high temperatures.

## Key findings

- MQ NMR coherences of zeroth and second order emerge
- Entangled states appear during system evolution
- Quantum discord is quantified at high temperature

## Abstract

Quantum correlations in multiple quantum (MQ) NMR experiments are investigated in two-spin systems (dimers). In the initial moment of time one spin is in a pure quantum polarized state and the other spin is in the thermodynamic equilibrium state defined by the temperature of the sample. MQ NMR dynamics of dimers is investigated. It is shown that MQ NMR coherences of only the zeroth and second orders emerge in such a system. The intensities of those coherences are calculated. Entangled states appear in the course of the system evolution in the MQ NMR experiment. The quantum discord is obtained in the high temperature approximation.