Abstract Models of light–matter interactions in quantum electrodynamics typically invoke the
dipole approximation,, in which atoms are treated as point-like objects when compared to …

We demonstrate a superconducting artificial atom with strong unidirectional coupling to a
microwave photonic waveguide. Our artificial atom is realized by coupling a transmon qubit …

Superconducting qubits in a waveguide have long-range interactions mediated by photons
that cause the emergence of collective states. Destructive interference between the qubits …

Coupling a resonator to a superconducting qubit enables various operations on the qubit,
including dispersive readout and unconditional reset. The speed of these operations is …

Qubits are physical, a quantum gate thus not only acts on the information carried by the qubit
but also on its energy. What is then the corresponding flow of energy between the qubit and …

We discuss whether, and under which conditions, it is possible to realize a heat engine
simply by dynamically modulating the couplings between the quantum working medium and …

Waveguides allow for direct coupling of emitters separated by large distances, offering a
path to connect remote quantum systems. However, when facing the distances needed for …

We present an AI-based decoding agent for quantum error correction of depolarizing noise
on the toric code. The agent is trained using deep reinforcement learning (DRL), where an …

The ability to control and measure the temperature of propagating microwave modes down
to very low temperatures is indispensable for quantum information processing and may …

The ability to control the direction of scattered light is crucial to provide flexibility and
scalability for a wide range of on-chip applications, such as integrated photonics, quantum …