Thermal Entanglement, Specific Heat and Quantum Discord in Open Quantum Systems Including Non-Markovian Processes

TL;DR

This paper investigates the behavior of entanglement and quantum discord in open quantum systems, deriving formulas for specific heat and analyzing their dynamics under non-Markovian processes, with implications for quantum memory and gate design.

Contribution

It introduces a formula for specific heat in open quantum systems within the Jaynes-Cummings regime and explores the dynamics of entanglement and quantum discord including non-Markovian effects.

Findings

Negative and divergent specific heat at low temperatures.

Stable entanglement regions depend on temperature and coupling.

No violent oscillations observed in quantum discord.

Abstract

Entanglement (EN) is a determinative correlation in designation of quantum gates and quantum memories. All quantum operations which are assembled by quantum circuits, are exposed to environment. However, quantum discord (QD) as a new key of resource for quantum information theory is in spotlight of research. Therefore, the study of EN and QD in open quantum systems seems to be important. In this Brief Report, We derived a formula for specific heat of the principle system as a part of open quantum system (in special for Jaynes-Cumming regime), and we looked for relations between entanglement and specific heat which is important for designing of the quantum memory. We also studied the dynamics of thermal EN and QD in Jaynes-Cumming regime including the Non-Markovian processes via Born-Markove approximation and obtained a regions of temperature and coupling constant between parts of systems which the entanglement of formation had a stable behavior .It seems to be useful to design the quantum gates. We observed the negative and divergence specific heat (in contradiction with third law of thermodynamics) in low temperature because the state of open system is entangle. According to obtained results, we did not find out any violence oscillation in quantum discord and because entanglement decreases with respect time, fast response to inputs is crucial for assembling quantum circuits and quantum memory.