772 citations · 3k across the 31 of their papers we have counts for
32 papers
Time optimal quantum state engineering
Sam Edmunds, Obinna Abah
The efficient generation of highly nonclassical quantum states is essential for emerging quantum technologies, yet it remains challenging due to decoherence and the long preparatio…
Quantum Otto machine with -deformed Pöschl-Teller oscillator
Collins O. Edet, Norshamsuri Ali, Rosdisham Endut +1
We study the impact of the potential parameters of the q-deformed modified Pöschl-Teller potential on the thermodynamic performance of a quantum Otto cycle, where the -deformed…
Optimal measurement-based quantum thermal machines in a finite-size system
Chinonso Onah, Obinna Uzoh, Obinna Abah
We present a measurement-based quantum thermal machine that extracts work from the back-action of generalized quantum measurements whose working medium is a coupled two-level quant…
Thermodynamic uncertainty relations for relativistic quantum thermal machines
Dimitris Moustos, Obinna Abah
We investigate a two-qubit SWAP thermal machine -- a streamlined analogue of the four-stroke Otto cycle -- whose working medium comprises inertially moving Unruh-DeWitt qubit detec…
Surpassing Carnot efficiency with relativistic motion
Dimitris Moustos, Obinna Abah
Relativistic thermal devices offer a unique platform for understanding the interplay between motion, quantum fields, and thermodynamics, revealing phenomena inaccessible to station…
Quantum thermal machines in BTZ black hole spacetime
Dimitris Moustos, Obinna Abah
We investigate an Otto thermodynamic cycle with a qubit Unruh-DeWitt detector as the working medium, coupled to a massless, conformally coupled scalar quantum field in the Hartle-H…
Entropy production rate and correlations of cavity magnomechanical system
Collins O. Edet, Muhammad Asjad, Denys Dutykh +2
We present the irreversibility generated by a stationary cavity magnomechanical system composed of a yttrium iron garnet (YIG) sphere with a diameter of a few hundred micrometers i…
Irreversibility in an optical parametric driven optomechanical system
Obinna Abah, Collins O. Edet, Norshamsuri Ali +2
We investigate the role of nonlinearity via optical parametric oscillator on the entropy production rate and quantum correlations in a hybrid optomechanical system. Specifically, w…
Assessment of Atomic and Molecular Physics in Africa
Stephane Kenmoe, Obinna Abah
We present the status of the research in the field of atomic and molecular physics in Africa as well as some challenges hindering the efforts being made by the African scientists.…
Activity Report of the Second African Conference on Fundamental and Applied Physics, ACP2021
Kétévi A. Assamagan, Obinna Abah, Amare Abebe +38
The African School of Fundamental Physics and Applications, also known as the African School of Physics (ASP), was initiated in 2010, as a three-week biennial event, to offer addit…
Exponential precision by reaching a quantum critical point
Louis Garbe, Obinna Abah, Simone Felicetti +1
Quantum metrology shows that by exploiting nonclassical resources it is possible to overcome the fundamental limit of precision found for classical parameter-estimation protocols.…
Quantum thermodynamic devices: from theoretical proposals to experimental reality
Nathan M. Myers, Obinna Abah, Sebastian Deffner
Thermodynamics originated in the need to understand novel technologies developed by the Industrial Revolution. However, over the centuries the description of engines, refrigerators…
Unified trade-off optimization of quantum harmonic Otto engine and refrigerator
Varinder Singh, Satnam Singh, Obinna Abah +1
We investigate quantum Otto engine and refrigeration cycles of a time-dependent harmonic oscillator operating under the conditions of maximum -function, a trade-off objective fu…
Critical Quantum Metrology with Fully-Connected Models: From Heisenberg to Kibble-Zurek Scaling
Louis Garbe, Obinna Abah, Simone Felicetti +1
Phase transitions represent a compelling tool for classical and quantum sensing applications. It has been demonstrated that quantum sensors can in principle saturate the Heisenberg…
Quantum Otto engines at relativistic energies
Nathan M. Myers, Obinna Abah, Sebastian Deffner
Relativistic quantum systems exhibit unique features not present at lower energies, such as the existence of both particles and antiparticles, and restrictions placed on the system…
Harnessing non-adiabatic excitations promoted by a quantum critical point
Obinna Abah, Gabriele De Chiara, Mauro Paternostro +1
Crossing a quantum critical point in finite time challenges the adiabatic condition due to the closing of the energy gap, which ultimately results in the formation of excitations.…
Energy optimization of two-level quantum Otto machines
Satnam Singh, Obinna Abah
We present the spin quantum Otto machine under different optimization criterion when function either as a heat engine or a refrigerator. We examine the optimal performance of the h…
Measurement-based cooling of a nonlinear mechanical resonator
Ricardo Puebla, Obinna Abah, Mauro Paternostro
We propose two measurement-based schemes to cool a nonlinear mechanical resonator down to energies close to that of its ground state. The protocols rely on projective measurements…
Quantum state engineering by shortcuts-to-adiabaticity in interacting spin-boson systems
Obinna Abah, Ricardo Puebla, Mauro Paternostro
We present a fast and robust framework to prepare non-classical states of a bosonic mode exploiting a coherent exchange of excitations with a two-level system ruled by a Jaynes-Cum…
Shortcut-to-adiabaticity quantum Otto refrigerator
Obinna Abah, Mauro Paternostro, Eric Lutz
We investigate the performance of a quantum Otto refrigerator operating in finite time and exploiting local counterdiabatic techniques. We evaluate its coefficient of performance a…
Energetic cost of quantum control protocols
Obinna Abah, Ricardo Puebla, Anthony Kiely +3
We quantitatively assess the energetic cost of several well-known control protocols that achieve a finite time adiabatic dynamics, namely counterdiabatic and local counterdiabatic…
Implications of non-Markovian dynamics on information-driven engine
Obinna Abah, Mauro Paternostro
The understanding of memory effects arising from the interaction between system and environment is a key for engineering quantum thermodynamic devices beyond the standard Markovian…
Shortcut-to-adiabaticity Otto engine: A twist to finite-time thermodynamics
Obinna Abah, Mauro Paternostro
We consider a finite-time Otto engine operating on a quantum harmonic oscillator and driven by shortcut-to-adiabaticity (STA) techniques to speed up its cycle. We study its efficie…
Performance of shortcut-to-adiabaticity quantum engines
Obinna Abah, Eric Lutz
We consider a paradigmatic quantum harmonic Otto engine operating in finite time. We investigate its performance when shortcut-to-adiabaticity techniques are used to speed up its c…