Quantum discord based on linear entropy and thermal negativity of qutrit–qubit mixed spin chain under the influence of external magnetic field
| Autor: | Mohammed Daoud, Abdallah Slaoui, Fadwa Benabdallah |
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| Rok vydání: | 2020 |
| Předmět: |
Quantum phase transition
Physics Quantum discord Statistical and Nonlinear Physics Quantum Physics Quantum entanglement Von Neumann entropy 01 natural sciences 010305 fluids & plasmas Theoretical Computer Science Electronic Optical and Magnetic Materials Quantum state Modeling and Simulation Qubit 0103 physical sciences Signal Processing Statistical physics Electrical and Electronic Engineering Qutrit 010306 general physics Quantum computer |
| Zdroj: | Quantum Information Processing. 19 |
| ISSN: | 1573-1332 1570-0755 |
| DOI: | 10.1007/s11128-020-02754-x |
| Popis: | We propose a reliable analytical method to evaluate the non-classical correlations based on linear entropy for an arbitrary qudit–qubit quantum state. The linear entropy is used to overcome the difficulty of the maximization of the classical correlations encountered when the von Neumann entropy is used in determining quantum discord. The quantum discord based on linear entropy is employed to derive the amount of quantum correlations in a qutrit–qubit mixed spin system in the thermal equilibrium at temperature T. We investigate also the situation when the system is embedded in an external magnetic field. The obtained amount of quantum discord is then compared with the measurement-induced disturbance (MID) and logarithmic negativity. The analysis shows that both QD and MID are more robust than entanglement. Besides, QD and MID can be exploited to determine the critical points of quantum phase transitions in the system. |
| Databáze: | OpenAIRE |
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