Resonances in superconducting quantum interference devices—SQUID’s

Abstract

Original superconducting quantum interference device (SQUID) design and measurement technique for flux noise source localization in SQUID systems Rev. Sci. Instrum. 74, 5118 (2003); 10.1063/1.1622979Nuclear magnetic resonance using a high temperature superconducting quantum interference device Washer size and shape dependencies of current steps due to standing waves in superconducting quantum interference devices (SQUIDS)

d-Wave Induced Zero-Field Resonances in dcπ-Superconducting Quantum Interference Devices

“…They will reveal, for example, whether characteristic properties related to the symmetry of the superconducting quantum state, such as the p phase shift in a dc p SQUID, are maintained in the dissipative voltage state of the junctions, up to the high corresponding Josephson frequencies at which superconducting quantumelectronic devices are to operate. Prominent features in the voltage states of dc SQUIDs are predicted to arise from the LC resonances in the SQUIDs, leading to current enhance-ments in the current-voltage I͑V ͒ characteristics around the resonance voltage [9][10][11][12]. Recently, the theories describing the effects of LC resonances on the currentvoltage characteristics of conventional SQUIDs have been extended, accounting for a possible complex mixed symmetry´s 1 i͑1 2´͒d x 2 2y 2 , 0 ,´, 1 of the order parameter [13].…”

Development of series SQUID array with on-chip filter for TES detector

“…The parallel resistance can not only increase the isolation levels and reduce crosstalk, but also can eliminate potential high frequency resonance due to its low power dissipation. [21,22] Several detailed design parameters of the proposed SSA amplifier are summarized in Table 1. Additionally, based on the design parameters presented above, we have also fabricated an SSA amplifier without the LPF as a comparison device.…”

“…[16][17][18] This allows the excess noise caused by V -Φ characteristics distortions to be effectively avoided, particularly in ultra-low-temperature (mK) TES readout amplifiers. [19][20][21][22] In this work, we develop an on-chip low pass filter (LPF) to suppress the Josephson oscillation interference between the individual SQUID cells. In addition, a highly symmetrical SSA amplifier layout is designed carefully to ensure that each SQUID cell senses same environmental electromagnetic field, thus improving the coherent flux further.…”

Current amplification with vertical Josephson interferometers

“…As the strip width becomes narrower, the fringe field effects become more important and may dominate if w and d are comparable 17 . Then, to a first approximation, the flux linked to the loop is Φ a = µ 0 A loop H a = µ 0 ldH a = L 0 lI a , where we have introduced the strip-line inductance per unit length L 0 = µ 0 d/w 7,15,16 which also takes into account the kinetic inductance, due to the motion of superelectrons. Indeed, the inductance of a superconducting strip transmission line was analytically derived by Chang 17 as far as the strip linewidth w exceeds about the insulation thickness t ox ; in the thick film approximation (t s >> λ), its formula for the inductance per unit length reduces to:…”