From single SQUID to superconducting quantum arrays

Kornev, V. K.; Kolotinskiy, Nikolay V.; Sharafiev, Aleksei; Soloviev, I. I.; Mukhanov, Oleg A.

doi:10.1063/1.4995632

Cited by 12 publications

(10 citation statements)

References 34 publications

(49 reference statements)

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“…Such method, which is valid in the ω 1 → 0 limit, yields a theoretical maximum value for L ranging from ∼ 70 dB (at I B /I 0 = 0.85) to ∼ 120 dB (at I B /I 0 = 1.3), for Φ = φ 0 /16. As discussed in many other previous works 8,[23][24][25][26][28][29][30] , the inability associated to many real bi-SQUIDs technologies to achieve performances similar to the ones anticipated theoretically is a critical problem. One of the main results in this paper is that the technology we propose is one of the first that enable real performance for a single bi-SQUID close to the theoretical ones.…”

Section: Resultsmentioning

confidence: 98%

“…Although such promising premises, Nb bi-SQUIDs with shunted Josephson tunnel junctions 27 , due to the large junction area and inductance, showed non ideal voltage response, with a linearity performance far from the expected one 8 . Instead, Nb bi-SQUIDs based on arrays of different numbers of interferometers, ranging between tens and hundreds of unit cells, have proven to be extremely effective for low-noise signal amplification and magnetic field sensing, exhibiting excellent performance in terms of linearity of the flux-to-voltage response [28][29][30] .…”

Section: Introductionmentioning

confidence: 99%

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Ultra-Highly Linear Magnetic Flux-to-Voltage response in Proximity-based Mesoscopic bi-SQUIDs

De Simoni,

Cassola,

Ligato

et al. 2021

Preprint

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Superconducting double-loop interferometers (bi-SQUIDs) have been introduced to produce magnetic flux sensors specifically designed to exhibit ultra-highly linear voltage response as a function of the magnetic flux. These devices are very important for the quantum sensing and for signal processing of signals oscillating at the radio-frequencies range of the electromagnetic spectrum. Here, we report an Al double-loop bi-SQUIDs based on proximitized mesoscopic Cu Josephson junctions. Such a scheme provides an alternative fabrication approach to conventional tunnel junction-based interferometers, where the junction characteristics and, consequently, the magnetic flux-to-voltage and magnetic fluxto-critical current device response can be largely and easily tailored by the geometry of the metallic weak-links. We discuss the performance of such sensors by showing a full characterization of the device switching current and voltage drop vs. magnetic flux for temperatures of operation ranging from 30 mK to ∼ 1 K. The figure of merit of the transfer function and of the total harmonic distortion are also discussed. The latter provides an estimate of the linearity of the flux-to-voltage device response, which obtained values as large as 45 dB. Such a result let us foresee a performance already on pair with that achieved in conventional tunnel junction-based bi-SQUIDs arrays composed of hundreds of interferometers.

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Section: Resultsmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Ultra-Highly Linear Magnetic Flux-to-Voltage response in Proximity-based Mesoscopic bi-SQUIDs

De Simoni,

Cassola,

Ligato

et al. 2021

Preprint

View full text Add to dashboard Cite

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“…Thanks to their high sensitivity, simple integrability and low heat dissipation, they are the key building block to implement ultrasensitive cryogenic magnetometers and inductively-coupled current amplifiers [1][2][3][4][5][6]. Moreover, they can be exploited as stand-alone devices or they can be included into larger systems, e. g., for signal processing applications [7]. The direct-current (DC) SQUID (which stands for Superconducting Quantum Interference Device) is the almost ubiquitous implementation of superconducting interferometers.…”

Section: Introductionmentioning

confidence: 99%

“…This behaviour is due to the quasi-sinusoidal V vs.φ SQUID characteristics, and although routinely it is exploited advantageously for magnetometry, it constitutes a drawback for the realization of current amplifiers. For the latter case, response linearity is a major requirement, which is generally improved through external reaction loops [1,3,6] or through the construction of arrays of SQUIDs [7,11], at the cost of a worsening of the operation bandwidth and device integrability. A solution to these restrictions has arisen from the introduction of multi-loop superconducting interferometers, the main types of which are bi-SQUIDs [12][13][14][15][16] and D-SQUIDs [17,18].…”

Section: Introductionmentioning

confidence: 99%

Ultra linear magnetic flux-to-voltage conversion in superconducting quantum interference proximity transistors

Simoni¹,

Giazotto²

2022

Preprint

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Superconducting interferometers are quantum devices able to transduce a magnetic flux into an electrical output with excellent sensitivity, integrability and power consumption. Yet, their voltage response is intrinsically non-linear, a limitation which is conventionally circumvented through the introduction of compensation inductances or by the construction of complex device arrays. Here we propose an intrinsically-linear flux-tovoltage mesoscopic transducer, called bi-SQUIPT, based on the superconducting quantum interference proximity transistor as fundamental building block. The bi-SQUIPT provides a voltage-noise spectral density as low as ∼ 10 −16 V/Hz 1/2 and, more interestingly, under a proper operation parameter selection, exhibits a spur-free dynamic range as large as ∼ 60 dB, a value on par with that obtained with state-of-the-art SQUID-based linear flux-to-voltage superconducting transducers. Furthermore, thanks to its peculiar measurement configuration, the bi-SQUIPT is tolerant to imperfections and non-idealities in general. For the above reasons, we believe that the bi-SQUIPT could provide a relevant step-beyond in the field of low-dissipation and low-noise current amplification with a special emphasis on applications in cryogenic quantum electronics.

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“…All the periodic responses of individual SQUIDs cancel, and the voltage response to an applied external magnetic field is single valued. Thus, the magnetic DC response is highly peaked and symmetric around zero magnetic field, with an extended linear part [19][20][21][22]. As a consequence, there is no need of feedback electronics, and therefore no limitation in frequency for this reason.…”

mentioning

confidence: 99%

High-Tc superconducting detector for highly-sensitive microwave magnetometry

Couëdo

Pawlowski

Kermorvant

et al. 2019

Applied Physics Letters

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We have fabricated arrays of High-T c Superconducting Quantum Interference Devices (SQUIDs) with randomly distributed loop sizes as sensitive detectors for Radio-Frequency (RF) waves. These subwavelength size devices known as Superconducting Quantum Interference Filters (SQIFs) detect the magnetic component of the electromagnetic field. We used a scalable ion irradiation technique to pattern the circuits and engineer the Josephson junctions needed to make SQUIDs. Here we report on a 300 SQUIDs series array with loops area ranging from 6 to 60 µm 2 , folded in a meander line covering a 3.5 mm×120 µm substrate area, made out of a 150 nm thick YBa 2 Cu 3 O 7 (YBCO) film. Operating at a temperature T = 66 K in an un-shielded magnetic environment, under low DC bias current (I = 60 µA) and DC magnetic field (B = 3 µT), this SQIF can detect a magnetic field of a few pT at a frequency of 1.125 GHz, which corresponds to a sensitivity of a few hundreds of fT/ √ Hz, and shows linear response over 7 decades in RF power.This work is a promising approach for the realization of low dissipative sub-wavelength GHz magnetometers.

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From single SQUID to superconducting quantum arrays

Cited by 12 publications

References 34 publications

Ultra-Highly Linear Magnetic Flux-to-Voltage response in Proximity-based Mesoscopic bi-SQUIDs

Ultra-Highly Linear Magnetic Flux-to-Voltage response in Proximity-based Mesoscopic bi-SQUIDs

Ultra linear magnetic flux-to-voltage conversion in superconducting quantum interference proximity transistors

High-Tc superconducting detector for highly-sensitive microwave magnetometry

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