Optimizing Quantum Teleportation and Dense Coding via Mixed Noise Under Non-Markovian Approximation

TL;DR

This paper investigates how mixed environmental noise and non-Markovian effects influence quantum teleportation and dense coding, revealing that certain noise combinations and magnetic fields can enhance quantum correlations.

Contribution

It provides analytical solutions for a two-qubit system under non-Markovian noise and demonstrates how noise mixing and magnetic fields can improve quantum communication protocols.

Findings

Mixing relaxation and dephasing noise benefits quantum teleportation and dense coding.

Applying strong magnetic fields enhances quantum correlations temporarily.

Solutions derived for non-Markovian quantum-state-diffusion equations.

Abstract

Physicists are attracted to open-system dynamics, how quantum systems evolve, and how they can protected from unnecessary environmental noise, especially environmental memory effects are not negligible, as with non-Markovian approximations. There are several methods to solve master equation of non-Markovian cases, we obtain the solutions of quantum-state-diffusion equation for a two qubit system using perturbation method, which under influence of various types of environmental noises, i.e., relaxation, dephasing and mix of them. We found that mixing these two types of noises benefit the quantum teleportation and quantum super-dense coding, that by introducing strong magnetic field on the relaxation processes will enhance quantum correlation in some time-scale.