241 citations · 1.4k across the 28 of their papers we have counts for
28 papers
Simplifying the design of multilevel thermal machines using virtual qubits
Ayaka Usui, Wolfgang Niedenzu, Marcus Huber
Quantum thermodynamics often deals with the dynamics of small quantum machines interfacing with a large and complex environment. Virtual qubits, collisional models and reset master…
Multi-spin counter-diabatic driving in many-body quantum Otto refrigerators
Andreas Hartmann, Victor Mukherjee, Glen Bigan Mbeng +2
Quantum refrigerators pump heat from a cold to a hot reservoir. In the few-particle regime, counter-diabatic (CD) driving of, originally adiabatic, work-exchange strokes is a promi…
Spin and density self-ordering in dynamic polarization gradients fields
Natalia Masalaeva, Wolfgang Niedenzu, Farokh Mivehvar +1
We study the zero-temperature quantum phase diagram for a two-component Bose-Einstein condensate in an optical cavity. The two atomic spin states are Raman coupled by two transvers…
Many-body quantum heat engines with shortcuts to adiabaticity
Andreas Hartmann, Victor Mukherjee, Wolfgang Niedenzu +1
Quantum heat engines are modeled by thermodynamic cycles with quantum-mechanical working media. Since high engine efficiencies require adiabaticity, a major challenge is to yield a…
Unraveling the quantum nature of atomic self-ordering in a ring cavity
Stefan Ostermann, Wolfgang Niedenzu, Helmut Ritsch
Atomic self-ordering to a crystalline phase in optical resonators is a consequence of the intriguing non-linear dynamics of strongly coupled atom motion and photons. Generally the…
Concepts of work in autonomous quantum heat engines
Wolfgang Niedenzu, Marcus Huber, Erez Boukobza
One of the fundamental questions in quantum thermodynamics concerns the decomposition of energetic changes into heat and work. Contrary to classical engines, the entropy change of…