Towards a 1 V Josephson Arbitrary Waveform Synthesizer

Kieler, Oliver; Behr, R.; Wendisch, R.; Bauer, Stephan; Palafox, L.; Kohlmann, J.

doi:10.1109/tasc.2014.2366916

Cited by 88 publications

(59 citation statements)

References 26 publications

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“…Previous 1 V JAWS chips used room-temperature inner-outer dc blocks to isolate the JJ arrays [9]–[11]. This approach is incompatible with on-chip Wilkinson splitters because the arrays must be isolated after the splitter.…”

Section: Advances In On-chip Circuitsmentioning

confidence: 99%

“…In the past, this broadband requirement was achieved by directly connecting each JJ array to a single dedicated channel of a high-speed pulse generator, with minimal off-chip and on-chip microwave components. This approach of using one channel per array has been used in all previous JAWS systems for the past 20 years, including the most recent systems with an rms output voltage of 1 V that used one chip with four arrays [9]-[10] and four chips with eight arrays [11]. …”

Section: Introductionmentioning

confidence: 99%

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Two-Volt Josephson Arbitrary Waveform Synthesizer Using Wilkinson Dividers

Flowers-Jacobs

Fox²,

Dresselhaus³

et al. 2016

IEEE Trans. Appl. Supercond.

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The root-mean-square (rms) output voltage of the NIST Josephson arbitrary waveform synthesizer (JAWS) has been doubled from 1 V to a record 2 V by combining two new 1 V chips on a cryocooler. This higher voltage will improve calibrations of ac thermal voltage converters and precision voltage measurements that require state-of-the-art quantum accuracy, stability, and signal-to-noise ratio. We achieved this increase in output voltage by using four on-chip Wilkinson dividers and eight inner-outer dc blocks, which enable biasing of eight Josephson junction (JJ) arrays with high-speed inputs from only four high-speed pulse generator channels. This approach halves the number of pulse generator channels required in future JAWS systems. We also implemented on-chip superconducting interconnects between JJ arrays, which reduces systematic errors and enables a new modular chip package. Finally, we demonstrate a new technique for measuring and visualizing the operating current range that reduces the measurement time by almost two orders of magnitude and reveals the relationship between distortion in the output spectrum and output pulse sequence errors.

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Section: Advances In On-chip Circuitsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Two-Volt Josephson Arbitrary Waveform Synthesizer Using Wilkinson Dividers

Flowers-Jacobs

Fox²,

Dresselhaus³

et al. 2016

IEEE Trans. Appl. Supercond.

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show abstract

“…T HE pulse-driven Josephson arbitrary waveform synthesizer (JAWS) has become an important instrument for ac voltage [1], [2] and impedance [3] metrology. Recent advances have allowed quantum-accurate audio-frequency waveforms to be synthesized at a record 2 V rms amplitude using this system [4].…”

Section: Introductionmentioning

confidence: 99%

“…Over the past 20 years, the primary challenge in optimizing the performance of the JAWS system has been to provide a stream of uniform bipolar current-bias pulses to all the dissipative superconducting Josephson junctions, which are distributed in series within multiple arrays. The high-speed pulses have been created by either binary [1] or ternary [5], [2] pattern generators, which have pulse density and other nonlinear performance limitations. Their multilevel signals have sometimes been combined with a continuous wave (CW) microwave signal [6] to improve pulse-bias uniformity and to excite the ternary pulse states of the junctions, namely quantized pulses of either polarity or no pulse (null state).…”

Section: Introductionmentioning

confidence: 99%

Josephson Arbitrary Waveform Synthesis With Multilevel Pulse Biasing

Brevik

Flowers-Jacobs

Fox

et al. 2017

IEEE Trans. Appl. Supercond.

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We describe the implementation of new commercial pulse-bias electronics that have enabled an improvement in the generation of quantum-accurate waveforms both with and without low-frequency compensation biases. We have used these electronics to apply a multilevel pulse bias to the Josephson arbitrary waveform synthesizer and have generated, for the first time, a quantum-accurate bipolar sinusoidal waveform without the use of a low-frequency compensation bias current. This uncompensated 1 kHz waveform was synthesized with an rms amplitude of 325 mV and maintained its quantum accuracy over a1.5 mA operating current range. The same technique and equipment was also used to synthesize a quantum-accurate 1 MHz sinusoid with a 1.2 mA operating margin. In addition, we have synthesized a compensated 1 kHz sinusoid with an rms amplitude of 1 V and a 2.7 mA operating margin.

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“…The SIB59 Q-WAVE project, financed within the EMRP call, has been a great advance in the European development of AC quantum standards, achieving the milestone of generating spectral high purity alternate signals up to 1 V voltage [4], it established the bases of the metrology of sampled signals, a fundamental step for the transformation of "conventional" to "digital" metrology. As support for these standards, a great deal of work has been developed in the evaluation of algorithms for the treatment of the signal and for the calculation of uncertainties.…”

Section: Introductionmentioning

confidence: 99%

Towards the propagation of AC quantum voltage standards, the EMPIR ACQ-PRO Project

Caballero

Aguilar

Behr

et al. 2017

18th International Congress of Metrology

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Abstract. The ACQ-PRO is an EMPIR Project, jointly founded by the European Union and the participating countries. The overall objective of the project is to provide trans-European access to AC quantum voltage standards, to increase research capacity and to establish the basis for future collaboration between metrological institutes working on AC quantum voltage standards. With this in mind, project tasks were designed. This paper describes the objectives and the first outcomes of the project. The most remarkable achievement are the results of experimental research visits working on ACQ voltage standards. The design of a new AC quantum voltage standards easier to integrate and operate that with the BIPM participation will be validated by a pioneering intercomparison. Besides a Good Practice Guide on the use of AC quantum voltage standards is under preparation. Two working groups on ACQ voltage standards and on cryogenics applications will be created within the activities of the project. Finally, the participant Institutes are establishing the strategic plans to ensure the coordinated developing of future AC Quantum Standards.

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Towards a 1 V Josephson Arbitrary Waveform Synthesizer

Cited by 88 publications

References 26 publications

Two-Volt Josephson Arbitrary Waveform Synthesizer Using Wilkinson Dividers

Two-Volt Josephson Arbitrary Waveform Synthesizer Using Wilkinson Dividers

Josephson Arbitrary Waveform Synthesis With Multilevel Pulse Biasing

Towards the propagation of AC quantum voltage standards, the EMPIR ACQ-PRO Project

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