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Nondegenerate three-wave mixing with the Josephson ring modulator
The Josephson ring modulator (JRM) is a device, based on Josephson tunnel junctions, capable of performing non-degenerate mixing in the microwave regime without losses. The generic scattering matrixExpand
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The flux qubit revisited to enhance coherence and reproducibility
The scalable application of quantum information science will stand on reproducible and controllable high-coherence quantum bits (qubits). Here, we revisit the design and fabrication of theExpand
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Evidence for coherent quantum phase slips across a Josephson junction array
Superconducting order in a sufficiently narrow and infinitely long wire is destroyed at zero temperature by quantum fluctuations, which induce $2\ensuremath{\pi}$ slips of the phase of the orderExpand
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Noiseless non-reciprocity in a parametric active device
The use of microwaves to read and write information in superconducting qubits usually requires magnetic components that are difficult to integrate with chip-based circuits. A cascade of parametricExpand
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Microwave characterization of Josephson junction arrays: implementing a low loss superinductance.
We have measured the plasma resonances of an array of Josephson junctions in the regime E(J)>>E(C), up to the ninth harmonic by incorporating it as part of a resonator capacitively coupled to aExpand
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Coherence and decay of higher energy levels of a superconducting transmon qubit.
We present measurements of coherence and successive decay dynamics of higher energy levels of a superconducting transmon qubit. By applying consecutive π pulses for each sequential transitionExpand
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Signal-to-pump back action and self-oscillation in double-pump Josephson parametric amplifier
We present the theory of a Josephson parametric amplifier employing two-pump sources. Our calculations are based on input-output theory, and can easily be generalized to any coupled system involvingExpand
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The Flux Qubit Revisited
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Asymmetric frequency conversion in nonlinear systems driven by a biharmonic pump.
A novel mechanism of asymmetric frequency conversion is investigated in nonlinear dispersive devices driven parametrically with a biharmonic pump. When the relative phase between the first and secondExpand
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Heisenberg-Limited Qubit Read-Out with Two-Mode Squeezed Light.
We show how to use two-mode squeezed light to exponentially enhance cavity-based dispersive qubit measurement. Our scheme enables true Heisenberg-limited scaling of the measurement, and crucially, itExpand
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