We demonstrate high-fidelity, quantum nondemolition, single-shot readout of a
superconducting flux qubit in which the pointer state distributions can be resolved to below …

In this work we derive the general conditions for obtaining nonreciprocity in multi-mode
parametrically-coupled systems. The results can be applied to a broad variety of optical …

Nonreciprocal devices perform crucial functions in many low-noise quantum measurements,
usually by exploiting magnetic effects. In the proof-of-principle device presented here, on the …

We describe the back action of microwave-photon detection via a Josephson photomultiplier
(JPM), a superconducting qubit coupled strongly to a high-quality microwave cavity. The …

A superconducting flux qubit is inductively coupled to a superconducting quantum
interference device (SQUID) magnetometer, capacitively shunted to form a 1.294-GHz …

We report high-fidelity, quantum non-demolition, single-shot readout of a superconducting
transmon qubit using a dc-biased superconducting low-inductance undulatory galvanometer …

We investigate the transient dynamics of a lumped-element oscillator based on a dc
superconducting quantum interference device (SQUID). The SQUID is shunted with a …

We present measurements of an amplifier operating at 3.8 GHz with 150 MHz of bandwidth
based on the microstrip input-coil resonance of a dc superconducting quantum interference …

Though superconducting qubits offer the potential for a scalable quantum computing
architecture, the high-fidelity readout necessary to execute practical algorithms has thus far …

This research investigates the realization of parametric amplification in superconducting
circuits and structures where nonlinearity is provided by Josephson junction (JJ) elements …