Ryan Kaufman
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View article: Exceeding the Parametric Drive Strength Threshold in Nonlinear Circuits
Exceeding the Parametric Drive Strength Threshold in Nonlinear Circuits Open
Superconducting quantum circuits rely on strong drives to implement fast gates, high-fidelity readout, and state stabilization. However, these drives can induce uncontrolled excitations, so-called "ionization", that compromise the fidelity…
View article: Practical Trainable Temporal Postprocessor for Multistate Quantum Measurement
Practical Trainable Temporal Postprocessor for Multistate Quantum Measurement Open
We develop and demonstrate a trainable temporal postprocessor (TPP) harnessing a simple but versatile machine learning algorithm to provide optimal processing of quantum measurement data subject to arbitrary noise processes for the readout…
View article: Simple, High Saturation Power, Quantum-limited, RF SQUID Array-based Josephson Parametric Amplifiers
Simple, High Saturation Power, Quantum-limited, RF SQUID Array-based Josephson Parametric Amplifiers Open
High-fidelity quantum non-demolition qubit measurement is critical to error correction and rapid qubit feedback in large-scale quantum computing. High-fidelity readout requires passing a short and strong pulse through the qubit's readout r…
View article: Pump-efficient Josephson parametric amplifiers with high saturation power
Pump-efficient Josephson parametric amplifiers with high saturation power Open
Circuit QED based quantum information processing relies on low noise amplification for signal readout. In the realm of microwave superconducting circuits, this amplification is often achieved via Josephson parametric amplifiers (JPA). In t…
View article: Practical Trainable Temporal Postprocessor for Multistate Quantum Measurement
Practical Trainable Temporal Postprocessor for Multistate Quantum Measurement Open
We develop and demonstrate a trainable temporal post-processor (TPP) harnessing a simple but versatile machine learning algorithm to provide optimal processing of quantum measurement data subject to arbitrary noise processes, for the reado…
View article: Realizing all-to-all couplings among detachable quantum modules using a microwave quantum state router
Realizing all-to-all couplings among detachable quantum modules using a microwave quantum state router Open
One of the primary challenges in realizing large-scale quantum processors is the realization of qubit couplings that balance interaction strength, connectivity, and mode confinement. Moreover, it is very desirable for the device elements t…
View article: Josephson parametric amplifier with Chebyshev gain profile and high saturation
Josephson parametric amplifier with Chebyshev gain profile and high saturation Open
We demonstrate a Josephson parametric amplifier design with a band-pass impedance matching network based on a third-order Chebyshev prototype. We measured eight amplifiers operating at 4.6 GHz that exhibit gains of 20 dB with less than 1 d…
View article: Parametric Amplifier Matching Using Legendre Prototypes
Parametric Amplifier Matching Using Legendre Prototypes Open
In this note we describe Josephson parametric amplifier (JPA) matching networks based on Legendre polynomials. These networks typically exhibit lower ripple and gentler roll-off than Chebyshev networks with similar parameters, and can be v…
View article: A modular quantum computer based on a quantum state router.
A modular quantum computer based on a quantum state router. Open
A central challenge for realizing large-scale quantum processors is the design and realization of qubit-qubit connections: we must be able to perform efficient gates between qubits, yet prevent connections from spoiling qubit quality or pr…
View article: Scaling Laws for Partially Developed Turbulence
Scaling Laws for Partially Developed Turbulence Open
We formulate multifractal models for velocity differences and gradients which describe the full range of length scales in turbulent flow, namely: laminar, dissipation, inertial, and stirring ranges. The models subsume existing models of in…
View article: Realizing all-to-all couplings among detachable quantum modules using a microwave quantum state router
Realizing all-to-all couplings among detachable quantum modules using a microwave quantum state router Open
One of the primary challenges in realizing large-scale quantum processors is the realization of qubit couplings that balance interaction strength, connectivity, and mode confinement. Moreover, it is very desirable for the device elements t…
View article: Overnight Risk Model: A Unique Capability
Overnight Risk Model: A Unique Capability Open
We present a novel risk measurement model capable of capturing overnight risk i.e. the risk encountered between the closing time of the previous day and the opening time of the next day. The risk model captures both the overnight risk and …