Adapted projection operator technique for the treatment of initial correlations

A Trevisan, A Smirne, N Megier, B Vacchini - Physical Review A, 2021 - APS
Standard theoretical descriptions of the dynamics of open quantum systems rely on the
assumption that the correlations with the environment can be neglected at some reference …

Improving the estimation of environment parameters via initial probe-environment correlations

H Ather, AZ Chaudhry - Physical Review A, 2021 - APS
Small, controllable quantum systems, known as quantum probes, have been proposed to
estimate various parameters characterizing complex systems such as the environments of …

The role of initial system-environment correlations in the accuracies of parameters within spin-spin model

AR Mirza, J Al-Khalili - arxiv preprint arxiv:2407.03584, 2024 - arxiv.org
We investigate the effect of initial system-environment correlations to improve the estimation
of environment parameters. By employing various physical situations of interest, we present …

Time evolution of quantum correlations in presence of state dependent bath

M Rashid, MQ Lone, PA Ganai - Physica Scripta, 2022 - iopscience.iop.org
The emerging quantum technologies heavily rely on the understanding of dynamics in open
quantum systems. In the Born approximation, the initial system-bath correlations are often …

The impact of quantum correlations on parameter estimation in a spin reservoir

AR Mirza, J Al-Khalili - Physica Scripta, 2024 - iopscience.iop.org
We study the impact of quantum correlations existing within the system-environment thermal
equilibrium state while estimating the parameters of the spin reservoir. By employing various …

Improving the estimation of environment parameters via a two-qubit scheme

AR Mirza, AZ Chaudhry - Scientific Reports, 2024 - nature.com
We demonstrate how using two qubits can drastically improve the estimation of environment
parameters compared to using only a single qubit. The two qubits are coupled to a common …

Entanglement dynamics of two coupled spins interacting with an adjustable spin bath: effect of an exponential variable magnetic field

A Dehghani, B Mojaveri, M Vaez - Quantum Information Processing, 2020 - Springer
The present work is devoted to studying the entanglement dynamics of two central spins
coupled in a spin environment and subjected, simultaneously, to an external magnetic field …

The role of initial system–environment correlations with a spin environment

AR Mirza, MN Jamil, AZ Chaudhry - International Journal of Modern …, 2024 - World Scientific
Open quantum systems are a subject of immense interest as their understanding is crucial in
the implementation of modern quantum technologies. In the study of their dynamics, the role …

Master equation incorporating the system-environment correlations present in the joint equilibrium state

AR Mirza, M Zia, AZ Chaudhry - Physical Review A, 2021 - APS
We present a general master equation, correct to second order in the system-environment
coupling strength, that takes into account the initial system-environment correlations. We …

Equilibration and typicality in quantum processes

P Figueroa-Romero - arxiv preprint arxiv:2102.02289, 2021 - arxiv.org
Forgetfulness is a common feature of nature. Moreover, without forgetfulness, repeatability
would be impossible. Despite this, small systems constantly leak information about their …