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Topic Area: Quantum Electrical Measurements
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31. Broadband lumped-element integrated n-way power dividers for programmable Josephson voltage standards
Topic: Quantum Electrical Measurements
Published: 8/12/2009
Authors: Mike Elsbury, Paul David Dresselhaus, Norman F Bergren, Charles J Burroughs, Samuel Paul Benz, Zoya Popovic
Abstract: This paper presents a monolithically integrated broadband lumped-element Wilkinson power divider centered at 20 GHz, which was designed and fabricated to uniformly distribute power to arrays of Josephson junctions (JJs) for superconducting voltage st ...

32. Reduced Nonlinearities and Improved Temperature Measurements for the NIST Johnson Noise Thermometer
Topic: Quantum Electrical Measurements
Published: 7/31/2009
Authors: Jifeng Qu, Samuel Paul Benz, Horst Rogalla, D. R White
Abstract: The variance of temperature measurements made with the NIST Johnson noise thermometer has been reduced by use of improved cross-correlation electronics and a unique method for measuring and reducing nonlinearities. The spectral response of the voltag ...

33. A 10 Volt 'Turn-Key' Programmable Josephson Voltage Standard for DC and Stepwise-Approximated Waveforms
Topic: Quantum Electrical Measurements
Published: 7/26/2009
Authors: Charles J Burroughs, Alain Rufenacht, Paul David Dresselhaus, Samuel Paul Benz, Mike Elsbury
Abstract: The output voltage of Programmable Josephson Voltage Standard (PJVS) circuits has reached the 10 V benchmark, which was set over twenty years ago by conventional dc Josephson Voltage Standard (JVS) systems. The non-hysteretic Josephson junctions in t ...

34. Improved Isotopic Analysis with a Large Array of Gamma-ray Microcalorimeters
Topic: Quantum Electrical Measurements
Published: 6/30/2009
Authors: Nikhil Jethava, Joel Nathan Ullom, Douglas Alan Bennett, William Bertrand Doriese, James A Beall, Gene C Hilton, Robert Daniel Horansky, Kent D Irwin, Eric Sassi
Abstract: We present results from the largest array of gamma-ray microcalorimeters operated to date. The microcalorimeters consist of Mo/Cu transition-edge sensors with attached Sn absorbers. The detector array contains 66 pixels each with an active area 2.25 ...

35. Arrays with double-stacked NbxSi1-x-Barrier Junctions for Use in Programmable Josephson Voltage Standards driven at 70 GHz
Topic: Quantum Electrical Measurements
Published: 6/16/2009
Authors: Franz Mueller, Ralf Behr, R. Wendisch, Johannes Kohlmann, Paul David Dresselhaus, Samuel Paul Benz
Abstract: Double-stacked Nb junctions with NbxSi1-x barriers were inserted into previously successfully tested 1 V and 10 V designs for Programmable Josephson voltage standards (PJVSs) with bias frequency near 70 GHz. Despite non-optimum targeting of the junct ...

36. Versatile co-sputtered Nb/NbxSi1-x/Nb Josephson junctions for Josephson voltage standards and high-speed superconducting digital electronics
Topic: Quantum Electrical Measurements
Published: 6/16/2009
Authors: David Olaya, Paul David Dresselhaus, Samuel Paul Benz
Abstract: Josephson junctions that use co-sputtered amorphous Nb-Si barriers can be made with a wide variety of electrical properties depending on both the thickness of the barrier and its ratio of Nb to Si. Critical current density (Jc), specific capacitance ...

37. Amorphous Nb-Si Barrier Junctions for Voltage Standard and Digital Applications
Topic: Quantum Electrical Measurements
Published: 6/3/2009
Authors: David Olaya, Paul David Dresselhaus, Samuel Paul Benz, Jon E. Bjarnason, Erich N Grossman
Abstract: Amorphous Nb-Si has been previously demonstrated as a Josephson junction barrier material for Nb-based superconducting voltage standard circuits, including both dc programmable and ac Josephson voltage standards operating at frequencies up to 20 GHz. ...

38. Nonlinear Behavior of Electronic Components Characterized with Precision Multitones from a Josephson Arbitrary Waveform Synthesizer
Topic: Quantum Electrical Measurements
Published: 6/3/2009
Authors: Samuel Paul Benz, Ryan C. Toonen
Abstract: We have extended the application of quantum-based electrical standards from single frequency calibrations to multi-tone tests that can be used to characterize the nonlinear behavior of electronic components and circuits. Specifically, we have used a ...

39. Tapered Transmission Lines with Dissipative Junctions
Topic: Quantum Electrical Measurements
Published: 6/3/2009
Authors: Paul David Dresselhaus, Mike Elsbury, Samuel Paul Benz
Abstract: NIST is optimizing the design of a 10 V programmable Josephson voltage standard so that it uses less microwave power by use of fewer parallel-biased arrays with higher voltage per array. Increasing the voltage per array by adding more junctions is ch ...

40. Application of the Josephson effect in electrical metrology
Topic: Quantum Electrical Measurements
Published: 6/1/2009
Authors: Samuel Paul Benz, B. Jeanneret
Abstract: Over the last 30 years, metrology laboratories have used the quantum behavior of the Josephson effect to greatly improve voltage metrology. The following article reviews the history and present status of the research and development Josephson voltage ...

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