595 citations · 2.7k across the 23 of their papers we have counts for
12 papers · 1 filter
Gain, directionality and noise in microwave SQUID amplifiers: Input-output approach
Archana Kamal, John Clarke, Michel Devoret
We present a new theoretical framework to analyze microwave amplifiers based on the dc SQUID. Our analysis applies input-output theory generalized for Josephson junction devices bi…
Pure dephasing in flux qubits due to flux noise with spectral density scaling as
S. M. Anton, C. Müller, J. S. Birenbaum +10
For many types of superconducting qubits, magnetic flux noise is a source of pure dephasing. Measurements on a representative dc superconducting quantum interference device (SQUID)…
Dispersive readout of a flux qubit at the single photon level
J. E. Johnson, E. M. Hoskinson, C. Macklin +3
A superconducting flux qubit is inductively coupled to a Superconducting QUantum Interference Device (SQUID) magnetometer, capacitively shunted to form a 1.294-GHz resonator. The q…
Localization of Metal-Induced Gap States at the Metal-Insulator Interface:Origin of Flux Noise in SQUIDs and Superconducting Qubits
SangKook Choi, Dung-Hai Lee, Steven G. Louie +1
The origin of magnetic flux noise in Superconducting Quantum Interference Devices with a power spectrum scaling as ( is frequency) has been a puzzle for over 20 years. Thi…
Model for l/f Flux Noise in SQUIDs and Qubits
Roger H. Koch, David P. DiVincenzo, John Clarke
We propose a model for 1/f flux noise in superconducting devices (f is frequency). The noise is generated by the magnetic moments of electrons in defect states which they occupy fo…
A Numerical Treatment of the Rf SQUID: II. Noise Temperature
Reinhold Kleiner, Dieter Koelle, John Clarke
We investigate rf SQUIDs (Superconducting QUantum Interference Devices), coupled to a resonant input circuit, a readout tank circuit and a preamplifier, by numerically solving the…
A Numerical Treatment of the Rf SQUID: I. General Properties and Noise Energy
Reinhold Kleiner, Dieter Koelle, John Clarke
We investigate the characteristics and noise performance of rf Superconducting Quantum Interference Devices (SQUIDs) by solving the corresponding Langevin equations numerically and…
Stabilizing Superconductivity in Nanowires by Coupling to Dissipative Environments
Henry C. Fu, Alexander Seidel, John Clarke +1
We present a theory for a finite-length superconducting nanowire coupled to an environment. We show that in the absence of dissipation quantum phase slips always destroy supercondu…
Flux Qubits and Readout Device with Two Independent Flux Lines
B. L. T. Plourde, T. L. Robertson, P. A. Reichardt +4
We report measurements on two superconducting flux qubits coupled to a readout Superconducting QUantum Interference Device (SQUID). Two on-chip flux bias lines allow independent fl…
Measurements of 1/ f noise in Josephson junctions at zero voltage: Implications for decoherence in superconducting quantum bits
Michael Mueck, Matthias Korn, C. G. A. Mugford +2
Critical current fluctuations with a 1/ f spectral density (f is frequency) are potentially a limiting source of intrinsic decoherence in superconducting quantum bits (qubits) base…
Decoherence in Josephson-junction qubits due to critical current fluctuations
D. J. Van Harlingen, T. L. Robertson, B. L. T. Plourde +3
We compute the decoherence caused by fluctuations at low frequency in the critical current of Josephson junctions incorporated into flux, phase, charge and hybrid f…
MgB2 tunnel junctions and 19 K low-noise dc superconducting quantum interference devices
Y. Zhang, D. Kinion, J. Chen +3
Point contact junctions made from two pieces of MgB2 can be adjusted to exhibit either superconductor-insulator-superconductor (SIS) or superconductor-normal metal-superconductor (…