Journal ArticleDOI
Shunted Josephson tunnel junctions: High-frequency, self-pumped low noise amplifiers
N. Calander,T. Claeson,S. Rudner +2 more
TLDR
In this article, the high-frequency amplification properties of transformer coupled, resistively shunted Josephson tunnel junctions have been investigated and the importance of the shunt loop inductance is stressed.Abstract:
The high‐frequency amplification properties of transformer coupled, resistively shunted Josephson tunnel junctions have been investigated. The importance of the shunt loop inductance is stressed. It allows a high cutoff frequency, of significance for good high‐frequency performance. The self‐pumped parametric amplifier showed none of the excessive noise rise, which has hitherto plagued the development of externally pumped Josephson junction amplifiers. Around 10 GHz, we estimated a noise temperature less than 30 K for an amplifier pumped by a Josephson oscillation with a frequency well above twice the signal frequency. The corresponding gain of 5 dB may be increased in a better impedance matched circuit. The gain was very stable against variations in the bias conditions. A gain‐bandwidth product as high as 0.3 was registered. The experimental results agreed well with the established theory for self‐pumped parametric Josephson amplifiers. It should be possible to extend the low noise amplification by this ...read more
Citations
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Journal ArticleDOI
Observation of 4.2 equilibrium noise squeezing via a Josephson-parametric amplifier
Bernard Yurke,P.G. Kaminsky,R. E. Miller,Edward A. Whittaker,A. D. Smith,A. H. Silver,R. W. Simon +6 more
TL;DR: The authors observed the squeezing of 4.2 K thermal noise using a Josephson parametric amplifier operated in the degenerate mode at 19.4 GHz with a 42% reduction in the equilibrium noise.
Journal ArticleDOI
Quantum‐statistical theory of microwave detection using superconducting tunnel junctions
TL;DR: In this article, a quantum statistical theory of microwave and millimeter-wave detection using superconducting tunnel junctions is developed, with a rigorous account of quantum, thermal, and shot noise arising from fluctuation sources associated with the junctions, signal source, and matching circuits.
Quantum Jumps and Measurement Backaction in a Superconducting Qubit
TL;DR: Slichter et al. as discussed by the authors implemented the first such high-fidelity readout scheme in a solid state circuit, a superconducting quantum bit (qubit) coupled to a microwave cavity in the circuit QED architecture.
Journal ArticleDOI
Low noise microwave parametric amplifier
TL;DR: In this paper, the authors reported the lowest noise temperature of any microwave amplifier except the maser, which is a nearly degenerate superconducting parametric amplifier at X-band consisting of a low β, thin film, single junction SQUID, a monolithic 50 Ω to 1 Ω impedance matching network, and a cooled circulator.
Journal ArticleDOI
Advanced Concepts in Josephson Junction Reflection Amplifiers
Pasi Lähteenmäki,Visa Vesterinen,Juha Hassel,Gheorghe Sorin Paraoanu,Heikki Seppä,Pertti Hakonen +5 more
TL;DR: In this article, an amplifier based on intrinsic negative resistance of a selectively damped Josephson junction was proposed to achieve low-noise amplification at microwave frequencies, which is the goal of the quantum limit.
References
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Journal ArticleDOI
A study of locking phenomena in oscillators
TL;DR: In this article, a differential equation is derived which gives the oscillator phase as a function of time, and with the aid of this equation, the transient process of "pull-in" as well as the production of distorted beat note are described in detail.
Journal ArticleDOI
Injection locking of microwave solid-state oscillators
TL;DR: Injection locking of microwave solid-state oscillators is discussed in this article, based on the familiar theorem that the total impedance times the current is equal to the applied voltage, based on which the locking range, large-signal injection, locking stability, and AM and FM noise are analyzed.
Journal ArticleDOI
S-c-S junctions as nonlinear elements of microwave receiving devices
A. N. Vystavkin,V. N. Gubankov,Leonid Kuzmin,Konstantin K. Likharev,V. Migulin,Vasili K. Semenov +5 more
TL;DR: In this paper, the S-c-S junction is defined as a structure in which weak link of two superconducting electrodes is created in the form of short circuit section of the same superconductor as electrodes with effective dimension A less than coherence length 03BE.
Journal ArticleDOI
Parametric amplification by unbiased Josephson junctions
TL;DR: In this article, the theory of parametric amplification by a series of unbiased Josephson junctions is presented, and various regimes of operation are explored, including a very small pump power and a large bandwidth.
Journal ArticleDOI
Generation of Harmonics and Subharmonics of the Josephson Oscillation
TL;DR: In this paper, the observation of harmonics and subharmonics of the Josephson oscillation is shown to be in agreement with a rather simple model of the junction, which provides an explanation of induced steps in the currentvoltage characteristic which occur at submultiples of the usual induced step voltages.