Multilayer Fabrication Process for Josephson Junction Circuits Cross-Compatible Over Two Foundries

Kiviranta, Mikko; Brandel, Oliver; Grönberg, Leif; Kunert, J.; Linzen, S.; Beev, Nikolai; May, T.; Prunnila, Mika

doi:10.1109/tasc.2016.2544821

Cited by 11 publications

(10 citation statements)

References 16 publications

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“…We present several important modifications to the JPA, the first of which is the fabrication of the Josephson junctions with the so-called side-wall passivated spacer (SWAPS) process that we introduced recently [32]. This enables us to largely avoid using plasma-enhanced chemical vapour deposited (PECVD) silicon dioxide which is a necessity in our standard niobium tunnel junction processes [33]. Measures to control the flux trapping are implemented as well.…”

Section: Introductionmentioning

confidence: 99%

A flux-driven Josephson parametric amplifier for sub-GHz frequencies fabricated with side-wall passivated spacer junction technology

Simbierowicz

Vesterinen

Grönberg

et al. 2018

Supercond. Sci. Technol.

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We present experimental results on a Josephson parametric amplifier tailored for readout of ultra-sensitive thermal microwave detectors. In particular, we discuss the impact of fabrication details on the performance. We show that the small volume of deposited dielectric materials enabled by the side-wall passivated spacer niobium junction technology leads to robust operation across a wide range of operating temperatures up to 1.5 K. The flux-pumped amplifier has gain in excess of 20 dB in three-wave mixing and its center frequency is tunable between 540 MHz and 640 MHz. At 600 MHz, the amplifier adds 105 mK ± 9 mK of noise, as determined with the hot/cold source method. Phase-sensitive amplification is demonstrated with the device.

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Section: Introductionmentioning

confidence: 99%

A flux-driven Josephson parametric amplifier for sub-GHz frequencies fabricated with side-wall passivated spacer junction technology

Simbierowicz

Vesterinen

Grönberg

et al. 2018

Supercond. Sci. Technol.

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“… ( a ) Simplified schematic representation of the measurement setup (see Supplementary Figs 3 and 4 from Supplementary Note 7 for more detailed schematics). The investigated resonator was made using a capacitively shunted superconducting quantum interference device (SQUID), fabricated using a NbAlO x Nb trilayer process at VTT 57 . The device forms a flux tunable resonator which acts as a tunable boundary condition for the reflected waves in the attached 50 Ω transmission line 21 .…”

Section: Figurementioning

confidence: 99%

Coherence and multimode correlations from vacuum fluctuations in a microwave superconducting cavity

et al. 2016

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The existence of vacuum fluctuations is one of the most important predictions of modern quantum field theory. In the vacuum state, fluctuations occurring at different frequencies are uncorrelated. However, if a parameter in the Lagrangian of the field is modulated by an external pump, vacuum fluctuations stimulate spontaneous downconversion processes, creating squeezing between modes symmetric with respect to half of the frequency of the pump. Here we show that by double parametric pumping of a superconducting microwave cavity, it is possible to generate another type of correlation, namely coherence between photons in separate frequency modes. The coherence correlations are tunable by the phases of the pumps and are established by a quantum fluctuation that stimulates the simultaneous creation of two photon pairs. Our analysis indicates that the origin of this vacuum-induced coherence is the absence of which-way information in the frequency space.

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“…In this section we present a recently developed technological process [7], which is aimed to analogue sensor readout and signal multiplexing (so-called mixed signal superconductor technology), for operating temperatures down to 300 mK. At the end we will discuss recent results of its first implementation.…”

Section: Low-t C Junctionsmentioning

confidence: 99%

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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Multilayer Fabrication Process for Josephson Junction Circuits Cross-Compatible Over Two Foundries

Cited by 11 publications

References 16 publications

A flux-driven Josephson parametric amplifier for sub-GHz frequencies fabricated with side-wall passivated spacer junction technology

A flux-driven Josephson parametric amplifier for sub-GHz frequencies fabricated with side-wall passivated spacer junction technology

Coherence and multimode correlations from vacuum fluctuations in a microwave superconducting cavity

Examples of superconducting technology application: Sensing and interfacing

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