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A near–quantum-limited Josephson traveling-wave parametric amplifier
Stringing together a powerful amplifier Amplifying microwave signals with high gain and across a broad range of frequencies is crucial in solid-state quantum information processing (QIP). AchievingExpand
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Analog information processing at the quantum limit with a Josephson ring modulator
Amplifiers are crucial in every experiment carrying out a very sensitive measurement. However, they always degrade the information by adding noise. Quantum mechanics puts a limit on how small thisExpand
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Dispersive magnetometry with a quantum limited SQUID parametric amplifier
Quantum Nanoelectronics Laboratory, Department of Physics, University of California, Berkeley, CA 94720There is currently fundamental and technological interest in measuring and manipulatingnanoscaleExpand
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Observation of quantum jumps in a superconducting artificial atom.
We continuously measure the state of a superconducting quantum bit coupled to a microwave readout cavity by using a fast, ultralow-noise parametric amplifier. This arrangement allows us to observeExpand
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RF-driven Josephson bifurcation amplifier for quantum measurement.
We have constructed a new type of amplifier whose primary purpose is the readout of superconducting quantum bits. It is based on the transition of a rf-driven Josephson junction between two distinctExpand
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Direct observation of dynamical bifurcation between two driven oscillation states of a Josephson junction.
We performed a novel phase-sensitive microwave reflection experiment which directly probes the dynamics of the Josephson plasma resonance in both the linear and the nonlinear regime. When theExpand
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Heralded state preparation in a superconducting qubit.
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 one part in 1000. In theExpand
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Design and characterization of a lumped element single-ended superconducting microwave parametric amplifier with on-chip flux bias line
We demonstrate a lumped-element Josephson parametric amplifier, using a single-ended design that includes an on-chip, high-bandwidth flux bias line. The amplifier can be pumped into its region ofExpand
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Stabilizing Rabi oscillations in a superconducting qubit using quantum feedback
The act of measurement bridges the quantum and classical worlds by projecting a superposition of possible states into a single (probabilistic) outcome. The timescale of this ‘instantaneous’ processExpand
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Cavity-assisted quantum bath engineering.
We demonstrate quantum bath engineering for a superconducting artificial atom coupled to a microwave cavity. By tailoring the spectrum of microwave photon shot noise in the cavity, we create aExpand
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