A universal fault-tolerant quantum computer that can efficiently solve problems such as
integer factorization and unstructured database search requires millions of qubits with low …

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 …

We reveal the cooperative effect of coherent and dissipative magnon-photon couplings in an
open cavity magnonic system, which leads to nonreciprocity with a considerably large …

In superconducting quantum computing, qubit state information is conveyed via low-power
microwave fields. As such, ultralow-noise microwave amplification plays a central role in …

Chirality or handedness distinguishes an object from its mirror images, such as the spread
thumb, index finger, and middle finger of the right and left hand. In mathematics, it is …

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 …

In this article, we provide a comprehensive review of past and present efforts in the field of
microwave nonreciprocity with an emphasis on the most commonly used nonreciprocal …

Nonreciprocal circuit elements form an integral part of modern measurement and
communication systems. Mathematically they require breaking of time-reversal symmetry …

Degenerate parametric amplifiers (DPAs) exhibit the unique property of phase-sensitive
gain and can be used to noiselessly amplify small signals or squeeze field fluctuations …

In quantum optics, it is common to assume that atoms are pointlike objects compared to the
wavelength of the electromagnetic field they interact with. However, this dipole …