Beyond Moore’s technologies: operation principles of a superconductor alternative

Soloviev, I. I.; Klenov, N. V.; Bakurskiy, S. V.; Kupriyanov, Mikhail Yu.; Gudkov, A. L.; Сидоренко, А. С.

doi:10.3762/bjnano.8.269

Cited by 164 publications

(105 citation statements)

References 169 publications

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“…In conventional Josephson junctions the phase difference is zero in the absence of applied current and is spatially independent in the absence of external magnetic field. It is anticipated that unconventional junctions either with a fixed phase shift ϕ 0 (ϕ-junctions), or with an in-built spatial phase variation along the junction ∆ϕ (0 − ϕ junctions) may provide additional functionality in Josephson electronics [1][2][3][4]. For example, they can operate as autonomous and persistent phase batteries -one of key elements of quantum [1,[5][6][7][8][9][10][11][12][13][14] and digital Josephson electronics [2,3,15,16].…”

Section: Introductionmentioning

confidence: 99%

Two mechanisms of Josephson phase shift generation by an Abrikosov vortex

2019

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Abrikosov vortex contains magnetic field and circulating currents that decay at a short range λ ∼ 100 nm. However, the vortex can induce a long range Josephson phase shift at distances r ∼ µm λ. The mechanism of this puzzling phenomenon is not clearly understood. Here we present a systematic study of vortex-induced phase shift in planar Josephson junctions. We make two key observations: (i) The cutoff effect: although vortexinduce phase shift is a long-range phenomenon, it is terminated by the junction and does not persists beyond it. (ii) A crossover from linear to superlinear dependence of the phase shift on the vortex polar angle occurs upon approaching of the vortex to the junction. The crossover occurs at a distance comparable with the penetration depth. This, together with theoretical and numerical analysis of the problem, allows unambiguous identification of two distinct and independent mechanisms. The short range mechanism is due to circulating vortex currents inside superconducting electrodes without involvement of magnetic field. The long range mechanism is due to stray magnetic fields outside electrodes without circulating vortex currents. We argue that understanding of controlling parameters of vortex-induced Josephson phase shift can be used for development of compact and fast electronic devices with low dissipation power.

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Section: Introductionmentioning

confidence: 99%

Two mechanisms of Josephson phase shift generation by an Abrikosov vortex

2019

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“…Now, with the end of industry-standard CMOS scaling in sight, diverse technologies are being sought for an impending technology transition, including ones that lower on-chip dissipation from logic gate power [1]. Superconducting computing, i.e., Single-Flux Quanta (SFQ) logic, offers two paths to greater efficiency in digital logic [2,3]. The first and prevalent one uses conventional SFQ gates, where static power has been greatly reduced and practically eliminated over the last five years [4,5,6].…”

Section: Introductionmentioning

confidence: 99%

Ballistic Reversible Gates Matched to Bit Storage: Plans for an Efficient CNOT Gate Using Fluxons

Osborn¹,

Wustmann²

2018

Reversible Computation

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New computing technologies are being sought near the end of CMOS transistor scaling, meanwhile superconducting digital, i.e., singleflux quantum (SFQ), logic allows incredibly efficient gates which are relevant to the impending transition. In this work we present a proposed reversible logic, including gate simulations and schematics under the name of Reversible Fluxon Logic (RFL). In the widest sense it is related to SFQ-logic, however it relies on (some approximately) reversible gate dynamics and promises higher efficiency than conventional SFQ which is logically irreversible. Our gates use fluxons, a type of SFQ which has topological-particle characteristics in an undamped Long Josephson junction (LJJ). The collective dynamics of the component Josephson junctions (JJs) enable ballistic fluxon motion within LJJs as well as good energy preservation of the fluxon for JJ-circuit gates. For state changes, the gates induce switching of fluxon polarity during resonant scattering at an interface between different LJJs. Related to the ballistic nature of fluxons in LJJ, the gates are powered, almost ideally, only by data fluxon momentum in stark contrast to conventionally damped logic gates which are powered continuously with a bias. At first the fundamental Identity and NOT gates are introduced. Then 2-bit gates are discussed, including the IDSN gate which actually allows low fluxon-number inputs for more than 4 input states. A digital CNOT, an important milestone for 2-bit reversible superconducting gates, is planned as a central result. It uses a store and launch gate to stop and then later route a fluxon. This use of the store and launch gate allows a clocked CNOT gate and synchronization within. The digital CNOT gate could enable high efficiency relative to conventional irreversible gates and shows the utility of the IDSN as a reversible gate primitive.

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“…In recent years hybrid Superconductor-Ferromagnet (SF) devices are being actively studied. The competition between superconductivity and magnetism in SF heterostructures leads to new phenomena and functionality which is interesting for variety of novel electronic and spintronic components, [9] such as phase shifters [10][11][12][13], superconducting spin valves [14][15][16][17][18][19], memory cells [20][21][22][23].…”

mentioning

confidence: 99%

Planar Superconductor-Ferromagnet-Superconductor Josephson Junctions as Scanning-Probe Sensors

2019

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We propose a novel type of magnetic scanning probe sensor, based on a single planar Josephson junction with a magnetic barrier. The planar geometry together with high magnetic permeability of the barrier helps to focus flux in the junction and thus enhance the sensitivity of the sensor. As a result, it may outperform equally sized SQUID both in terms of the magnetic field sensitivity and the spatial resolution in one scanning direction. We fabricate and analyze experimentally sensor prototypes with a superparamagnetic CuNi and a ferromagnetic Ni barrier. We demonstrate that the planar geometry allows easy miniaturization to nm-scale, facilitates an effective utilization of the self-field phenomenon for amplification of sensitivity and a simple implementation of a control line for feed-back operation in a broad dynamic range.

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Beyond Moore’s technologies: operation principles of a superconductor alternative

Cited by 164 publications

References 169 publications

Two mechanisms of Josephson phase shift generation by an Abrikosov vortex

Two mechanisms of Josephson phase shift generation by an Abrikosov vortex

Ballistic Reversible Gates Matched to Bit Storage: Plans for an Efficient CNOT Gate Using Fluxons

Planar Superconductor-Ferromagnet-Superconductor Josephson Junctions as Scanning-Probe Sensors

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