We propose tunable chiral bound states in a system composed of superconducting giant
atoms and a Josephson photonic-crystal waveguide (PCW), with no analog in other …

Currently available quantum processors are dominated by noise, which severely limits their
applicability and motivates the search for new physical qubit encodings. In this work, we …

A microwave amplifier combining noise performances as close as possible to the quantum
limit with large bandwidth and high saturation power is highly desirable for many solid-state …

The detection of microwave fields at single-photon power levels is a much-sought-after
technology, with practical applications in nanoelectronics and quantum information science …

We report the results of an axion dark matter search over an axion mass range of 9.39–9.51
μ eV. A flux-driven Josephson parametric amplifier (JPA) was added to the cryogenic …

Many experiments that interrogate fundamental theories require detectors whose
sensitivities are limited by the laws of quantum mechanics. In cavity-based searches for …

Quantum communication protocols based on nonclassical correlations can be more efficient
than known classical methods and offer intrinsic security over direct state transfer. In …

The low-noise amplification of weak microwave signals is crucial for countless protocols in
quantum information processing. Quantum mechanics sets an ultimate lower limit of half a …

A Josephson parametric amplifier (JPA) can create squeezed states of microwave light,
lowering the noise associated with certain quantum measurements. We experimentally …

We present a cavity-electromechanical system comprising a superconducting quantum
interference device which is embedded in a microwave resonator and coupled via a pickup …