Characterizing cryogenic amplifiers with a matched temperature-variable noise source.
Slawomir Simbierowicz,Visa Vesterinen,Joshua Milem,Aleksi Lintunen,Mika Oksanen,Leif Roschier,Leif Grönberg,Juha Hassel,David Gunnarsson,Russell E. Lake +9 more
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In this article, the authors present a cryogenic microwave noise source with a characteristic impedance of 50 Ω, which can be installed in a coaxial line of a cryostat.Abstract:
We present a cryogenic microwave noise source with a characteristic impedance of 50 Ω, which can be installed in a coaxial line of a cryostat. The bath temperature of the noise source is continuously variable between 0.1 K and 5 K without causing significant back-action heating on the sample space. As a proof-of-concept experiment, we perform Y-factor measurements of an amplifier cascade that includes a traveling wave parametric amplifier and a commercial high electron mobility transistor amplifier. We observe system noise temperatures as low as 680−200+20 mK at 5.7 GHz corresponding to 1.5−0.7+0.1 excess photons. The system we present has immediate applications in the validation of solid-state qubit readout lines.read more
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Broadband Continuous-Variable Entanglement Generation Using a Kerr-Free Josephson Metamaterial
TL;DR: In this paper , the authors used superconducting Josephson metamaterials to generate color-entangled photons from vacuum fluctuations at a high rate, showing the presented system to be a superb microwave entanglement generator with remarkable bandwidth.
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Engineering the thin film characteristics for optimal performance of superconducting kinetic inductance amplifiers using a rigorous modelling technique
TL;DR: In this paper , the authors present a novel modeling technique that can better capture the electromagnetic behavior of a KITWPA without the translation symmetry assumption, allowing them to flexibly explore the use of more complex transmission line structures and better predict their performance.
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Microwave calibration of qubit drive line components at millikelvin temperatures
TL;DR: In this article , a data-based methodology of short-open-load calibration at a temperature of 30 mK was used to report calibrated 1-port scattering parameter data of individual qubit drive line components.
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High-fidelity quantum information transmission using a room-temperature nonrefrigerated lossy microwave waveguide
TL;DR: In this paper , the authors proposed a high-fidelity quantum microwave transmission using a room-temperature lossy waveguide, which consists of connecting two cryogenic nodes (i.e., a transmitter and a receiver) by the room temperature lossy microwave waveguide.
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Circuit quantum electrodynamic model of dissipative-dispersive Josephson traveling-wave parametric amplifiers
TL;DR: In this paper , a quantum mechanical model for a four-wave mixing Josephson traveling-wave parametric amplifier including substrate losses and associated thermal fluctuations was presented, and the authors derived an analytic solution for the bosonic annihilation operator of the weak signal photon field using temporal equations of motion in a reference timeframe.
References
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Cavity quantum electrodynamics for superconducting electrical circuits: An architecture for quantum computation
Alexandre Blais,Ren-Shou Huang,Ren-Shou Huang,Andreas Wallraff,Steven Girvin,Robert Schoelkopf +5 more
TL;DR: In this paper, a realizable architecture using one-dimensional transmission line resonators was proposed to reach the strong coupling limit of cavity quantum electrodynamics in superconducting electrical circuits.
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Introduction to quantum noise, measurement, and amplification
TL;DR: In this paper, a pedagogical introduction to the physics of quantum noise and its connections to quantum measurement and quantum amplification is given, and the basics of weak continuous measurements are described.
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Quantum limits on noise in linear amplifiers
TL;DR: In this paper, a multimode analysis of phase-sensitive linear amplifiers is presented, where a lower bound on the noise carried by one quadrature phase of a signal and a corresponding lower limit on the amount of noise that a high-gain linear amplifier must add to another is established.
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A quantum engineer's guide to superconducting qubits
Philip Krantz,Philip Krantz,Morten Kjaergaard,Fei Yan,Terry P. Orlando,Simon Gustavsson,William D. Oliver +6 more
TL;DR: In this paper, the authors provide an introductory guide to the central concepts and challenges in the rapidly accelerating field of superconducting quantum circuits, including qubit design, noise properties, qubit control and readout techniques.
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A near–quantum-limited Josephson traveling-wave parametric amplifier
C. Macklin,C. Macklin,Kevin O'Brien,David Hover,Mollie Schwartz,Vladimir Bolkhovsky,Xiang Zhang,Xiang Zhang,Xiang Zhang,William D. Oliver,Irfan Siddiqi +10 more
TL;DR: A superconducting amplifier based on a Josephson junction transmission line that exhibited high gain over a gigahertz-sized bandwidth and was able to perform high-fidelity qubit readout and has broad applicability to microwave metrology and quantum optics.