37 citations · 66 across the 15 of their papers we have counts for
15 papers
Coherence-Enhanced Spatial Quantum Thermometry
Asghar Ullah, Giovanni Scala, Luis L. Sánchez-Soto +1
Quantum thermometry has long promised sensitivities beyond classical limits, with recent paradigms highlighting quantum coherence as a primary driver of precision. While most studi…
Collective-dissipation-induced dark and metastable-like states for enhanced quantum battery performance
Achraf Khoudiri, Asghar Ullah, Abderrahim El Allati +1
We investigate the role of symmetry-protected dark states and metastable-like frozen states in the autonomous charging dynamics of open quantum batteries described by a transverse-…
Topological Engine Monitor: Persistent Homology-Based Fault Detection in Finite-Time Quantum Engines
Miraç Kerem Maden, Asghar Ullah, Baris Coskunuzer +1
The reliable operation of finite-time quantum heat engines is fundamentally limited by control imperfections that induce nonadiabatic phase accumulation and quantum friction, degra…
Squeezing- and non-Gaussianity-enhanced quantum thermometry and magnetometry via quadratic interactions in optomechanical-like systems
Asghar Ullah, Özgür E. Müstecaplıoğlu
Standard optomechanical sensors operating in the low-temperature regime often face fundamental precision limits imposed by vacuum fluctuations. Here, we demonstrate that moving bey…
Harnessing Floquet dynamics for selective metrology in few-qubit systems
Asghar Ullah, Hasan Mermer, Melih Özkurt +2
Periodically driven quantum systems can function as highly selective parameter filters. We demonstrate this capability in a finite-size, three-qubit system described by the transve…
Optimizing quantum sensing networks via genetic algorithms and deep learning
Asghar Ullah, Özgür E. Müstecaplıoğlu, Matteo G. A. Paris
We investigate the optimization of graph topologies for quantum sensing networks designed to estimate weak magnetic fields. The sensors are modeled as spin systems governed by a tr…
Optimal strategies for transient and equilibrium quantum thermometry using Gaussian and non-Gaussian probes
Asghar Ullah, M. Tahir Naseem, Özgür E. Müstecaplıoğlu
We study temperature estimation using quantum probes, including single-mode initial states and two-mode states generated via stimulated parametric down-conversion in a nonlinear cr…
Configuration-dependent precision in magnetometry and thermometry using multi-qubit quantum sensors
Asghar Ullah, Özgür E. Müstecaplıoğlu, Matteo G. A. Paris
We study the performance of quantum sensors composed of four qubits arranged in different geometries for magnetometry and thermometry. The qubits interact via the transverse-field…
Quantum metrology of a structured reservoir
Youssef Aiache, Asghar Ullah, Özgür E. Müstecaplıoğlu +1
Accurately characterizing the properties of structured reservoirs is a key challenge in quantum systems and is of great importance for advances in quantum metrology and sensing. In…
Single-qubit probes for temperature estimation in the presence of collective baths
Asghar Ullah, Marco Cattaneo, Özgür E. Müstecaplıoğlu
We study the performance of single-qubit probes for temperature estimation in the presence of collective baths. We consider a system of two qubits, each locally dissipating into it…
Quantum thermometry for ultralow temperatures using probe and ancilla qubit chains
Asghar Ullah, Vipul Upadhyay, Özgür E. Müstecaplıoğlu
We propose a scheme to enhance the range and precision of ultralow temperature measurements by employing a probe qubit coupled to a chain of ancilla qubits. Specifically, we analyz…
Quantum thermometry with an optomechanical system
Asghar Ullah, Ali Pedram, M. Tahir Naseem +1
We present a quantum thermometry method utilizing an optomechanical system composed of an optical field coupled to a mechanical resonator for measuring the unknown temperature of a…
Mixing thermal coherent states for precision and range enhancement in quantum thermometry
Asghar Ullah, M. Tahir Naseem, Özgür E. Müstecaplıoğlu
The unavoidable interaction between thermal environments and quantum systems typically leads to the degradation of quantum coherence, which can be fought against by reservoir engin…
Low-temperature quantum thermometry boosted by coherence generation
Asghar Ullah, M. Tahir Naseem, Özgür E. Müstecaplıoğlu
The precise measurement of low temperatures is significant for both the fundamental understanding of physical processes and technological applications. In this work, we present a m…
Dynamics of quantum Fisher information in a squeezed thermal bath
Asghar Ullah
In this paper, the dynamics of quantum Fisher information of a qubit interacting with a squeezed thermal environment are studied. The optimal initial state of the qubit, the temper…