Gauge freedom in quantum electrodynamics (QED) outside of textbook regimes is reviewed.
It is emphasized that QED subsystems are defined relative to a choice of gauge. Each …

The study of open quantum systems often relies on approximate master equations derived
under the assumptions of weak coupling to the environment. However when the system is …

Quantum heat engines are expected to outperform the classical counterparts due to
quantum coherences involved. Here we experimentally execute a single-ion quantum heat …

We introduce a two-qubit engine that is powered by entanglement and local measurements.
Energy is extracted from the detuned qubits coherently exchanging a single excitation …

Open systems of coupled qubits are ubiquitous in quantum physics. Finding a suitable
master equation to describe their dynamics is therefore a crucial task that must be …

We consider a finite-time quantum Otto cycle with single-and two spin-1/2 systems as its
working medium. To mimic adiabatic dynamics at a finite time, we employ a shortcut-to …

We examine a quantum Otto engine with a harmonic working medium consisting of two
particles to explore the use of wave function symmetry as an accessible resource. It is shown …

In classical thermodynamics energy always flows from the hotter system to the colder one.
However, if these systems are initially correlated, the energy flow can reverse, making the …

The introduction of the quantum analogue of a Carnot engine based on a bath comprising of
particles with a small amount of coherence initiated an active line of research on the …

We compare quantum Otto engines based on two different cycle models: a two-bath model,
with a standard heat source and sink, and a measurement-based protocol, where the role of …