10 citations · 14 across the 9 of their papers we have counts for
10 papers
Investigating entanglement dynamics with dynamical decoupling together with initial qubit-reservoir correlations
Rifzah Shahid, Amna Qadeer, Ali Raza Mirza
We study the exact entanglement dynamics of two qubits coupled to a common bosonic reservoir through a pure dephasing interaction. We ask how this dynamics changes when the qubits…
Sensing high-frequency ac fields via a two-qubit sensor
Rizwan Abbas, Ali Raza Mirza, Adam Zaman Chaudhry
Quantum sensors allow us to measure weak oscillating fields with incredible precision. One common approach is to use the time evolution of a single two-level system (or a qubit) in…
AC nuclear Stark effect in H-atom via super-intense laser-atom interaction
Ali Raza Mirza, Rizwan Abbas, Atif Shahbaz
We investigate the nuclear Stark effect induced in hydrogen-like atomic nuclei under super-intense laser fields. Since laser wavelengths are generally larger than nuclear dimension…
The effect of non-selective measurement on the parameter estimation within spin-spin model
Ali Raza Mirza, Jim Al-Khalili
We investigate the role of non-selective measurement on the estimation of system-environment parameters. Projective measurement is the popular method of initial state preparation w…
The role of initial system-environment correlations in the accuracies of parameters within spin-spin model
Ali Raza Mirza, Jim Al-Khalili
We investigate the effect of initial system-environment correlations to improve the estimation of environment parameters. By employing various physical situations of interest, we p…
Improving the understanding of the dynamics of open quantum systems
Ali Raza Mirza
This thesis presents studies performed on open quantum systems, that is, quantum systems interacting with their surrounding environment. Such systems are important not only in unde…
Improving the estimation of the environment parameters via a two-qubit scheme
Ali Raza Mirza, Adam Zaman Chaudhry
We demonstrate how using two qubits can drastically improve the estimation of environment parameters as compared to using only a single qubit. The two qubits are coupled to a commo…
The role of initial system-environment correlations with a spin environment
Ali Raza Mirza, Mah Noor Jamil, Adam Zaman Chaudhry
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 r…
A master equation incorporating the system-environment correlations present in the joint equilibrium state
Ali Raza Mirza, Muhammad Zia, Adam Zaman Chaudhry
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 a…
Thermal field theory at next-to-leading order in the hard thermal loop expansion
A. Mirza, M. E. Carrington
In this paper we study the hard-thermal-loop effective theory at next-to-leading order. Standard power-counting predicts that a large number of diagrams, including 2-loop diagrams,…