Development of Josephson voltage standards

Kohlmann, J.; Behr, R.

doi:10.5772/17031

Cited by 10 publications

(10 citation statements)

References 84 publications

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“…Superconducting Josephson junctions provide highprecision frequency-to-voltage conversion known as the Shapiro effect [1,2]. In fact, the modern standard of the volt is based on arrays of Josephson junctions connected to a microwave field with frequency controlled by an atomic frequency standard [3][4][5]. Moreover, as an essential building block of superconducting quantum interference devices (SQUIDs) Josephson junctions provide magnetic-flux-to-voltage conversion enabling highprecision magnetic-flux measurements [6].…”

Section: Introductionmentioning

confidence: 99%

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Phonon-Josephson resonances in atomtronic circuits

2016

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We study the resonant excitation of sound modes from Josephson oscillations in Bose-Einstein condensates. From the simulations for various setups using the Gross-Piaevski mean field equations and Josephson equations we observe additional tunneling currents induced by resonant phonons. The proposed experiment may be used for spectroscopy of phonons as well as other low-energy collective excitations in Bose-Einstein condensates. We also argue that the observed effect may mask the observation of Shapiro resonances if not carefully controlled.

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Section: Introductionmentioning

confidence: 99%

“…This may be due to the fact that coupling of Josephson oscillations to other excitations with similar frequencies masks the observation of Shapiro resonances. The existence of such coupling effects is well known from superconducting Josephson systems [26][27][28] as well as from superfluid 3 He [29].…”

Section: Introductionmentioning

confidence: 99%

Phonon-Josephson resonances in atomtronic circuits

2016

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“…Setting α = 0 in Eq. (28), and retaining the term n = 0 only, the voltage drop on the QPSJ as a function of ω B reads as…”

Section: Appendix B: Qpsj In the Absence Of Microwavesmentioning

confidence: 99%

“…(18) and (28), and recall some of the results provided by the P (E) − theory [54], which describes the phase slippage in the presence of an external environment [37,55]. Setting α = 0 in Eq.…”

Section: Appendix B: Qpsj In the Absence Of Microwavesmentioning

confidence: 99%

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Quantum phase-slip junction under microwave irradiation

2015

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We consider the dynamics of a quantum phase-slip junction (QPSJ), a dual Josephson junction, connected to a microwave source with frequency ω mw . With respect to an ordinary Josephson junction, a QPSJ can sustain dual Shapiro steps, consisting of well-defined current plateaus at multiple integers of eω mw /π in the current-voltage (I -V ) characteristic. The experimental observation of these plateaus has been elusive up to now. We argue that thermal as well as quantum fluctuations can smear the I -V characteristic considerably. In order to understand these effects, we study a current-biased QPSJ under microwave irradiation and connected to an inductive and resistive environment. We find that the effect of the fluctuations is governed by the resistance of the environment and by the ratio of the phase-slip energy and the inductive energy. Our results are of interest for experiments aiming at the observation of dual Shapiro steps in QPSJ devices for the definition of a new quantum current standard.

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Optimized Reproduction, Collection, Transmission, Processing, and Display of Measurement Data Obtained Using the National Standard of Voltage Unit – Volt

2021

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Issues associated with automating the calibration of standard DC voltage measuring instruments are considered. An automatic calibration system is developed, studied, and implemented. This system comprises a hardware and software system containing measuring instruments from the National Standard of Voltage Unit -Volt and additional modules. The automatic system is created on the basis of the Python programming language using metrological principles. The studied calibration results of DC voltage standards, i.e., the obtained calibration results (assigned actual value with expanded uncertainty) are analyzed in automatic and manual modes, as well as using the 10 V Josephson voltage standard known as supraVOLTcontrol. As well as signifi cantly reducing labor costs, the application of this automatic system to study the integral instability (nonlinearity) of a digital voltmeter allows measurement duration to be reduced, as well as providing fl exibility and reconfi guration capability depending on issues that emerge during research.

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Development of Josephson voltage standards

Cited by 10 publications

References 84 publications

Phonon-Josephson resonances in atomtronic circuits

Phonon-Josephson resonances in atomtronic circuits

Quantum phase-slip junction under microwave irradiation

Optimized Reproduction, Collection, Transmission, Processing, and Display of Measurement Data Obtained Using the National Standard of Voltage Unit – Volt

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