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 …

Superconducting microwave cavities featuring ultrahigh Q-factors, which measure the
efficiency of energy storage in relation to energy loss in a system, are revolutionizing …

We show that a common language can be used to unify the description of parametrically
coupled circuits—parametric amplifiers, frequency converters, and parametric nonreciprocal …

We experimentally realize circularly polarized unidirectional cavity magnon polaritons in a
torus-shaped microwave cavity loaded by a small magnetic sphere. At special positions, the …

Building large-scale superconducting quantum circuits will require miniaturization and
integration of supporting devices including microwave circulators, which are currently bulky …

Nonreciprocal components, such as isolators and circulators, are crucial components for
photonic systems. In this article, we review theoretical and experimental progress toward …

A chiral photonic interface is a quantum system that has different probabilities for emitting
photons to the left and right. An on-chip compatible chiral interface is attractive for both …

Superconducting qubits are a leading platform for scalable quantum computing and
quantum error correction. One feature of this platform is the ability to perform projective …

Nonreciprocal microwave routing plays a crucial role in measuring quantum circuits, and
allows for realizing cascaded quantum systems for generating and stabilizing entanglement …

Systematic errors in qubit state preparation arise due to non-idealities in qubit control lines
such as impedance mismatch. Using a data-based methodology of short-open-load …