Recent Developments in Superconductor Digital Electronics Technology at FLUXONICS Foundry

Kunert, J.; Brandel, Oliver; Linzen, S.; Wetzstein, O.; Toepfer, Hannes; Ortlepp, Thomas; Meyer, H.‐G.

doi:10.1109/tasc.2013.2265496

Cited by 27 publications

(15 citation statements)

References 32 publications

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“…assumed during simulation. The circuits under investigation were fabricated by the Leibniz Institute of Photonic Technology, Jena, Germany [7]. Fig.…”

Section: Circuit Under Investigationmentioning

confidence: 99%

Experimental Analysis of the Bias Dependent Sensitivity of a Josephson Comparator

Haddad

Engert

Brandel

et al. 2015

IEEE Trans. Appl. Supercond.

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The Josephson comparator is one of the building blocks of superconductor electronics. It is used as a decision element in all analog and digital circuits. For fast high-bandwidth analog-to-digital converters as well as for digital circuits with reduced switching energy its high sensitivity is most important. Thermal noise limits its decision uncertainty. In this work we analyze the influence of the bias current on the gray zone of a Josephson comparator. Circuit simulations are compared against experimental data. The experimental analysis shows a characteristic dependence of the gray zone on the bias current. We can identify a clear minimum value. This point is related to a certain clock frequency. At low frequencies the simulated relationship between the gray zone and the bias current is in very good agreement with experimental results. The comparison confirmed the circuit model and enables to adjust the design to certain applications to realize the best trade-off between clock frequency and grey zone. The article describes the experimental validation procedure and a derived normalized dependency in detail.

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“…assumed during simulation. The circuits under investigation were fabricated by the Leibniz Institute of Photonic Technology, Jena, Germany [7]. Fig.…”

Section: Circuit Under Investigationmentioning

confidence: 99%

Experimental Analysis of the Bias Dependent Sensitivity of a Josephson Comparator

Haddad

Engert

Brandel

et al. 2015

IEEE Trans. Appl. Supercond.

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“…Additionally we use this technology for testing measurement schemes [2] and mimicking scalable designs for quantum computation [3]. The second is aimed for the application of single flux quantum (SFQ) circuits -digital superconducting electronics [4]. The SFQ technology is provided in frame of the IPHT-based FLUXONICS Foundry [5] -a strategic development based on the European roadmap of superconductive electronics [6].…”

Section: Low-t C Junctionsmentioning

confidence: 99%

“…The dc-magnetron sputtering is used for deposition of Nb and Al, and reactive ion-etching (RIE) in CF 4 To control their damping and suppresses the hysteresis of the tunnel junctions, a shunt resistor layer of AuPd is deposited by sputtering and patterned by lift-off. Because of its temperature independent resistance in the temperature range of interest, this material is chosen.…”

Section: Low-t C Junctionsmentioning

confidence: 99%

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Examples of superconducting technology application: Sensing and interfacing

Kunert

IJsselsteijn

Il’ichev

et al. 2017

Low Temperature Physics

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Technological processes for the fabrication of low-and high-T c Josephson junctions, aimed for certain applications, are described. On the one hand, the integration of low-T c superconductor digital electronics with superconducting sensor arrays enables input signal processing with quantum limited resolution at millikelvin temperatures. We describe this mixed signal superconductor technology for analogue sensor readout and signal multiplexing for operating temperatures down to 300 mK. On the other hand, by making use of modern high-T c Josephson junction technology, sensitive magnetometers, which require a modest cooling power, can be developed. Examples of the application of the mentioned processes are shown.

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“…Development of new low power micro-circuitry is a crucial requirement for future digital information technologies [1][2][3][4][5][6]. Superconducting materials capable of transferring electric signals without dissipation provide a potential solution towards this goal.…”

Section: Introductionmentioning

confidence: 99%

Manipulating Abrikosov vortices with soft magnetic stripes

Vlasko-Vlasov

Colauto

Buzdin³

et al. 2017

Phys. Rev. B

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Tuning the polarization of a periodic array of magnetic stripes on top of a superconducting film allows control of Abrikosov vortex motion. Using direct magneto-optical imaging of the vortex patterns, we demonstrate that the proximity of the magnetic stripe ends to the edges of the superconducting film can strongly alter the vortex dynamics. We observe qualitatively different vortex behavior when the stripes overlap with the film edges. From the resulting unique magnetic flux patterns, we calculate the magnetic pinning strength of our stripe array and study effects of the modified edge barrier on vortex guidance and gating that result from different polarizations of the stripes .

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Recent Developments in Superconductor Digital Electronics Technology at FLUXONICS Foundry

Cited by 27 publications

References 32 publications

Experimental Analysis of the Bias Dependent Sensitivity of a Josephson Comparator

Experimental Analysis of the Bias Dependent Sensitivity of a Josephson Comparator

Examples of superconducting technology application: Sensing and interfacing

Manipulating Abrikosov vortices with soft magnetic stripes

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