High operating temperature in V-based superconducting quantum interference proximity transistors

Ligato, Nadia; Marchegiani, Giampiero; Virtanen, Pauli; Strambini, Elia; Giazotto, Francesco

doi:10.1038/s41598-017-09036-0

Cited by 21 publications

(21 citation statements)

References 44 publications

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“…Such a choice implies a different trade-off between the heat capacity (determined by volume and resistance) of the junction, the DOS gap giving the linear-response absorption threshold, and the kinetic inductance. We expect lithographic fabrication of both short [44] and long [17] junction devices is feasible.…”

Section: Discussionmentioning

confidence: 99%

Josephson Photodetectors via Temperature-to-Phase Conversion

Virtanen¹,

Ronzani

Giazotto³

2018

Phys. Rev. Applied

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We theoretically investigate the temperature-to-phase conversion (TPC) process occurring in dc superconducting quantum interferometers based on superconductor-normal-metal-superconductor (S-N-S) mesoscopic Josephson junctions. In particular, we predict the temperature-driven rearrangement of the phase gradients in the interferometer under the fixed constraints of fluxoid quantization and supercurrent conservation. This mechanism allows sizeable phase variations across the junctions for suitable structure parameters and temperatures. We show that the TPC can be a basis for sensitive singlephoton sensors or bolometers. We propose a radiation detector realizable with conventional materials and state-of-the-art nanofabrication techniques. Integrated with a superconducting quantum-interference proximity transistor as a readout setup, an aluminum-based TPC calorimeter can provide a large signal-to-noise ratio >100 in the 10-GHz-10-THz frequency range and a resolving power larger than 10 2 below 50 mK for terahertz photons. In the bolometric operation, electrical noise equivalent power of approximately 10 −22 W= ffiffiffiffiffiffi Hz p is predicted at 50 mK. This device can be attractive as a cryogenic singlephoton sensor operating in the giga-and terahertz regime with applications in dark-matter searches.

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Section: Discussionmentioning

confidence: 99%

Josephson Photodetectors via Temperature-to-Phase Conversion

Virtanen¹,

Ronzani

Giazotto³

2018

Phys. Rev. Applied

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“…Here, we take the electron density at the Fermi energy of aluminum to be N F = 2.15 × 10 47 J −1 m −3 [23][24][25]. Although the critical temperature of Ti Dayem bridges is similar to that of the Al, we point out that the Ti is not contributing to the observed effects.…”

Section: -2mentioning

confidence: 99%

Unveiling mechanisms of electric field effects on superconductors by a magnetic field response

Bours

Mercaldo

Cuoco

et al. 2020

Phys. Rev. Research

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We demonstrate that superconducting aluminium nanobridges can be driven into a state with complete suppression of the critical supercurrent via electrostatic gating. Probing both in-and out-of-plane magnetic field responses in the presence of electrostatic gating can unveil the mechanisms that primarily cause the superconducting electric field effects. Remarkably, we find that a magnetic field, independently of its orientation, has only a weak influence on the critical electric field that identifies the transition from the superconducting state to a phase with vanishing critical supercurrent. This observation points to the absence of a direct coupling between the electric field and the amplitude of the superconducting order parameter or 2π-phase slips via vortex generation. The magnetic field effect observed in the presence of electrostatic gating is described within a microscopic model where a spatially uniform interband π phase is stabilized by the electric field. Such an intrinsic superconducting phase rearrangement can account for the suppression of the supercurrent, as well as for the weak dependence of the critical magnetic fields on the electric field.

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“…Differently from short-junction SQUIPTs [13,15], the I(Φ) characteristic is not only Φ 0 -periodic, but it is also strongly hysteretic in Φ. This is highlighted in Fig.…”

Section: Resultsmentioning

confidence: 89%

Persistent Josephson Phase-Slip Memory with Topological Protection

Ligato

Strambini

Paolucci

et al. 2021

Preprint

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Superconducting computing promises enhanced computational power in both classical and quantum approaches. Yet, efficient schemes for scalable and fast superconducting memories are still missing. On the one hand, the large inductance required in magnetic flux-controlled Josephson memories impedes device miniaturization and scalability. On the other hand, schemes based on the ferromagnetic order to store information often degrades superconductivity, and limits the operation speed to the magnetization switching rate of a few GHz. Here, we overcome these limitations with a fully superconducting memory cell based on the hysteretic phase-slip transition existing in long aluminum nanowire Josephson junctions. The memory logic state is codified in the topological index of the junction providing a robust protection against stocastic phase slips and magnetic flux noise. Our direct and non-destructive read-out schemes, based on local DC or AC tunneling spectroscopy, ensure reduced dissipation (≤ 40 fW) thereby yielding a very low energy per bit read-out power consumption as low as ~ 10-24 J as estimated from the typical time response of the structure (≤ 30 ps). The memory, measured over several days, showed no evidence of information degradation up to ~1.1 K, i.e., ~85% of the critical temperature of aluminum. The ease of operation combined with remarkable performance elects the Josephson phase-slip memory as an attractive storage cell to be exploited in advanced superconducting classical logic architectures or flux qubits.

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High operating temperature in V-based superconducting quantum interference proximity transistors

Cited by 21 publications

References 44 publications

Josephson Photodetectors via Temperature-to-Phase Conversion

Josephson Photodetectors via Temperature-to-Phase Conversion

Unveiling mechanisms of electric field effects on superconductors by a magnetic field response

Persistent Josephson Phase-Slip Memory with Topological Protection

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