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At high bias, in the presence of a hot spot, the emission frequency f e is continuously tunable via changing the bias current and the bath temperature, but at low bias f e remains discrete, indicating phase locking to cavity resonances, though some groups of junctions seem to remain unlocked. Though some differences appear, these phenomena can be reproduced in simulations combining electrodynamics and heat diffusion. Modern particle accelerators utilize superconducting cavities cooled by superfluid helium, the maximum accelerating field being limited by cavity quenching, caused by heating from tiny surface defects.
Locating these quench spots and subsequently removing the defects can improve the maximum accelerating field, for better accelerator performance and cost reduction.
This article reports an approach for locating quench spots that significantly advances the state of the art. A proof-of-concept experiment also uncovers important physics for solving a decades-long puzzle underlying the operation of a widely adopted cavity diagnostic.
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The topic of latency in superconducting nanowire single-photon detectors SNSPDs, the fastest type of such sensors is of interest for understanding the absolute limits of timing performance in these devices, but so far no model of the detection mechanism could quantitatively explain recent measurements of intrinsic jitter and latency. This analysis of the connection between detector latency and timing jitter in the presence of Fano fluctuations and spatial nonuniformity provides a framework for studying the intrinsic jitter in SNSPDs, and suggests that intrinsic jitter could be reduced by enhancing scattering to suppress superconductivity as quickly as possible.
Superconducting coplanar microwave resonators may serve as a quantum bus to transfer information from superconducting qubits to natural spin systems, such as ultracold atomic vapors, for long-lived quantum memory. The authors investigate a stacked two-chip superconducting device, consisting of a lumped-element resonator side-coupled to a coplanar-waveguide transmission line. By moving the chips relative to each other, the device can be operated in different regimes, enabling control over both the resonance frequency and the coupling.
This system has the advantage of providing tunable coupling to clouds of ultracold atoms that must be operated at millitesla-level magnetic fields. In the quest to realize a quantum computer, physicists are dealing with signals that can be as weak as a single microwave photon. To detect such signals with sufficient quantum efficiency to implement e. To this end, the authors present a broadband, nearly quantum-limited parametric amplifier based on the tunneling of quasiparticles in a superconducting junction. This development may allow the generation of microwave continuous-variable cluster states, and is expected to have great impact on quantum information science.
This protocol is particularly suitable for realizing the controlled- Z C Z gate, but a counterdiabatic Hamiltonian requires a variable, complex coupling of qubits. By introducing a representation transformation and a rescaling method, this work uses the STA protocol to obtain a high-fidelity C Z gate with two coupled transmon qubits. This method affords high flexibility in the evolution time and control waveform, and is expected to be directly useful in other quantum systems as well.
Josephson parametric amplifiers JPAs are key devices in superconducting quantum circuits, as they ultimately dictate quantum efficiency and speed of measurement, but they still suffer from low saturation power. Modeling such an array as a nonlinear L C resonator reproduces the observed amplification and saturation effects very well. This use of arrays to fight low power saturation is easy to implement, and can be directly combined with impedance-engineered environments to enhance dynamic range even more. Superconducting nanowires have been critical in e.
This work explores a nanowire device that can controllably trap flux in discrete quantities, can respond proportionally to the strength of its input, and can be operated to achieve multilevel output with distinguishable states. This may offer a platform for nonbinary nanowire technologies, such as multilevel memory, or tunable elements for multilevel logic operations.
The field effect, as in a field-effect transistor FET , allows control of the switching current in a metallic superconductor, without affecting the critical temperature or normal-state resistance. Here magnetotransport experiments on Ti-based superconducting FETs reveal several physical insights: The phenomenon occurs at the sample surface, the field effect causes a transition from ballistic to tunnel-like behavior, and a mixed superconducting—normal-metal state is possible at high gate voltages. Such a device could be the cornerstone of easily fabricated monolithic architectures for classical or quantum computing, and a host of other applications in opto electronics.
Modeling supercurrent density and magnetic field penetration in a superconducting wire is important in the design of quantum computing circuits and kinetic-inductance detectors.
The authors develop an exact numerical method for computing the electrodynamic properties of superconducting wires that takes full account of nonlocality. They find that wires in the nonlocal regime i.
Strongly driven superconducting circuits are a versatile platform to implement a multitude of Hamiltonians for quantum computation, simulation, and sensing. Unfortunately, they can display complex dynamics with instabilities, so predicting and preventing these instabilities is crucial for applications. This paper proposes an inductively shunted transmon qubit as the elementary circuit optimized for strong parametric drives. Developing a numerical approach that avoids the limitations of perturbative analysis, the authors demonstrate that adding the inductive shunt significantly extends the range of pump powers in which the circuit is stable.
The authors discuss the peculiar behavior of the critical current I c of a temperature-biased Josephson tunnel junction between different superconductors. Their theoretical exploration of coherent thermal transport in such a junction reveals the abrupt variation of I c as the electrodes forming the device reside at specific temperatures. This phenomenon could provide a basis for applications such as heat rectification or radiation sensing. Specifically, the authors suggest a single-photon detector operating in the dissipationless dynamical regime.
The main challenge in scanning SQUID microscopy the most sensitive technique for magnetometry is the inverse proportionality between magnetic field sensitivity and spatial resolution. Having a similar field sensitivity, planar junctions may outperform SQUIDs of the same size in terms of spatial resolution. This is important for developing advanced scanning-probe sensors with both high sensitivity and resolution. Ferromagnetic Josephson junctions FJJs , comprised of two superconductors separated by a ferromagnet, have been developed extensively because of their unconventional physical properties and potential applications in superconducting spintronics.
Nevertheless, the dynamical properties of FJJs have not been sufficiently investigated. Proper selection of the superconducting material provides dynamic access to the spin-polarized supercurrents in FJJs for high-frequency device applications.
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Quantum coherence can be manifested in the time domain as quantum interference and diffraction, in analogy to optical interference and diffraction in real space, but time-domain diffraction has not received much attention. This work harnesses a superconducting qutrit three-level system under periodically modulated microwave fields to demonstrate diffraction in the time domain, revealing that the widths of the diffraction fringes are independent of the control-field power.
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