The performance of superconducting qubits has improved by several orders of magnitude in
the past decade. These circuits benefit from the robustness of superconductivity and the …

Quantum information processing relies on the precise control of non-classical states in the
presence of many uncontrolled environmental degrees of freedom. The interactions …

Heat engines convert thermal energy into mechanical work and generally involve a large
number of particles. We report the experimental realization of a single-atom heat engine. An …

Full manipulation of a quantum system requires controlled evolution generated by nonlinear
interactions, which is coherent when the rate of nonlinearity is large compared with the rate …

Condensed matter physics has been driven forward by significant experimental and
theoretical progress in the study and understanding of equilibrium phase transitions based …

We consider a quantum Otto cycle for a time-dependent harmonic oscillator coupled to a
squeezed thermal reservoir. We show that the efficiency at maximum power increases with …

Physical systems usually exhibit quantum behavior, such as superpositions and
entanglement, only when they are sufficiently decoupled from a lossy environment …

This work is concerned with determination of the steady-state structure of time-independent
Lindblad master equations, especially those possessing more than one steady state. The …

The control of individual quantum systems is now a reality in a variety of physical settings.
Feedback control is an important class of control methods because of its ability to reduce the …

Quantum error correction codes are designed to protect an arbitrary state of a multi-qubit
register from decoherence-induced errors, but their implementation is an outstanding …