Signal and noise characteristics of bi-SQUID

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

doi:10.1088/0953-2048/27/11/115009

Cited by 25 publications

(23 citation statements)

References 16 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…2(a). This device can provide a high-linearity voltage response to the applied magnetic flux Φ e , when a proper critical current value I c3 is assigned to the third Josephson junction J3 [21,22]. Figure 2(b) shows the highly linear response, which is triangular at l ∼ 1 and hysteretic at l > 1, where l = 2πI c L rf /Φ 0 is normalized value of the rf SQUID loop inductance L rf, I c is critical current of the dc SQUIDloop junctions J1 and J2, 0 / 2 h e Φ = (h is Plank constants, and e is electron charge) is magnetic flux quantum.…”

Section: Cells Of Superconducting Quantum Arraysmentioning

confidence: 99%

From single SQUID to superconducting quantum arrays

Kornev

Kolotinskiy

Sharafiev

et al. 2017

Low Temperature Physics

View full text Add to dashboard Cite

Superconducting quantum arrays (SQAs) capable of providing highly linear voltage response to magnetic signal and high dynamic range have been suggested and developed. Base elements of the arrays, quantum cells, were devised and studied in detail. Using niobium process, SQAs with different number of the cells and prototypes of the SQA-based broadband active electrically small antennas were fabricated and tested.

show abstract

Section: Cells Of Superconducting Quantum Arraysmentioning

confidence: 99%

From single SQUID to superconducting quantum arrays

Kornev

Kolotinskiy

Sharafiev

et al. 2017

Low Temperature Physics

View full text Add to dashboard Cite

show abstract

“…The responses calculated from these expressions for a chosen set of parameters i b = 2, Σi c = 1.9, ∆i c = −0.3, Σr n = 2.05, ∆r n = 0.35, Σl = 1, and ∆l = 0, − 0.8 are shown in Fig. 9(a) by solid lines, while the data obtained by numerical calculations of system (29) are presented by dots. It is seen that the data are well consistent despite the fact that oscillating part of the difference phase (41) is found approximately.…”

Section: 12mentioning

confidence: 99%

“…Figure 11(a) presents the averaged circulating current (54) calculated for ∆i c = 0, ∆r n = −0.35 and ∆i c = 0.3, ∆r n = 0 at i b = Σi c = 1.9, Σr n = 2.05, l = 0 (solid lines). Corresponding data calculated numerically using system (29) are shown by dots. It is seen that even for small absolute current values i * cir the data corresponding to the averaged circulating current in SQUID with asymmetry of the critical currents are perfectly consistent.…”

Section: 22mentioning

confidence: 99%

“…9(a) but i b = 2.45 (∆l = 0), and for SQUID with inverted asymmetry of the critical currents and shunt resistances (∆i c → −∆i c , ∆r n → −∆r n , while Σi c , Σr n are held the same). The data obtained by expression (54) are shown by lines, and the ones calculated numerically using (29) are presented by dots. While consistency of the curves remains to be just qualitative, the offset to the averaged circulating current is found precisely.…”

Section: 22mentioning

confidence: 99%

See 1 more Smart Citation

Analytical derivation of DC SQUID response

Soloviev

Klenov

Schegolev

et al. 2016

Supercond. Sci. Technol.

Self Cite

View full text Add to dashboard Cite

We consider voltage and current responses formation in DC SQUID with overdamped Josephson junctions in resistive and superconducting state in the frame of resistively shunted junction (RSJ) model. For simplicity we neglect the junction capacitance and the noise effect. Explicit expressions for the responses in resistive state were obtained for a SQUID which is symmetrical with respect to bias current injection point. Normalized SQUID inductance l = 2eIcL/ (where Ic is the critical current of Josephson junction, L is the SQUID inductance, e is the electron charge and is the Planck constant) was assumed to be within the range l ≤ 1, subsequently expanded up to l ≈ 7 using two fitting parameters. SQUID current response in superconducting state was considered for arbitrary value of the inductance. Impact of small technological spread of parameters relevant for low-temperature superconductor (LTS) technology was studied with generalization of the developed analytical approach for a case of small difference of critical currents and shunt resistances of the Josephson junctions, and inequality of SQUID inductive shoulders for both resistive and superconducting states.Comparison with numerical calculation results shows that developed analytical expressions can be used in practical LTS SQUIDs and SQUID-based circuits design, e.g. large serial SQIF, drastically decreasing the time of simulation.PACS numbers: 85.25.Dq, 85.25.Am

show abstract

“…A mitigation of these restrictions came from the introduction of a class of superconducting interferometers containing a third a) Electronic mail: giorgio.desimoni@sns.it b) Electronic mail: francesco.giazotto@sns.it JJ connected in parallel with the inductance loop of a DC SQUID. In such devices, namely called bi-SQUIDs [23][24][25][26] , the third JJ, is used as additional non-linear element operating in parallel to compensate for the non-linear response of the DC-SQUID resulting in a highly linear voltage response [23][24][25] . 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 .…”

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

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.

show abstract

Signal and noise characteristics of bi-SQUID

Cited by 25 publications

References 16 publications

From single SQUID to superconducting quantum arrays

From single SQUID to superconducting quantum arrays

Analytical derivation of DC SQUID response

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

Contact Info

Product

Resources

About