Quantum-mechanical effects at the macroscopic level were first explored in Josephson-
junction-based superconducting circuits in the 1980s. In recent decades, the emergence of …

Engineered quantum systems enabling novel capabilities for computation and sensing have
blossomed in the last decade. Architectures benefiting from combining complementary …

Quantum illumination uses entangled signal-idler photon pairs to boost the detection
efficiency of low-reflectivity objects in environments with bright thermal noise. Its advantage …

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 …

Light–matter interactions at the single-particle level have generally been explored in the
context of atomic, molecular and optical physics. Recent advances motivated by quantum …

We revisit a question asked by Dyson:“Is a graviton detectable?” We demonstrate that in
both Dyson's original sense and in a more modern measurement-theoretic sense, it is …

Radiation sensors based on the heating effect of absorbed radiation are typically simple to
operate and flexible in terms of input frequency, so they are widely used in gas detection 1 …

Quantum emitters respond to resonant illumination by radiating part of the absorbed energy.
A component of this radiation field is phase coherent with the driving tone, whereas another …

Large-scale quantum information processing networks will most probably require the
entanglement of distant systems that do not interact directly. This can be done by performing …

The major task of detecting axions or axion-like particles has two challenges. On the one
hand, the ultimate sensitivity is required, down to the energy of a single microwave photon of …