We propose and demonstrate a read-out technique for a superconducting qubit by
dispersively coupling it with a Josephson parametric oscillator. We employ a tunable quarter …

Quantum computing requires a delicate balance between coupling quantum systems to
external instruments for control and readout, while providing enough isolation from sources …

Coupling a resonator to a superconducting qubit enables various operations on the qubit,
including dispersive readout and unconditional reset. The speed of these operations is …

The duration and fidelity of qubit readout are critical factors for applications in quantum-
information processing as they limit the fidelity of algorithms which reuse qubits after …

Achieving individual qubit readout is a major challenge in the development of scalable
superconducting quantum processors. We have implemented the multiplexed readout of a …

We analyze a single-shot readout for superconducting qubits via the controlled catch,
dispersion, and release of a microwave field. A tunable coupler is used to decouple the …

The parametric phase-locked oscillator (PPLO) is a class of frequency-conversion device,
originally based on a nonlinear element such as a ferrite ring, that served as a fundamental …

We have realized a new interaction between superconducting qubits and a readout cavity
that results in the displacement of a coherent state in the cavity, conditioned on the state of …

The ability to perform fast, high-fidelity readout of quantum bits (qubits) is essential to the
goal of building a quantum computer. However, coupling a fast measurement channel to a …

We describe how to perform fast quantum limited readout of a solid state qubit biased at its
degeneracy point. The method is based on homodyne detection of the phase of a …