Josephson Junctions for Digital Applications

Mukhanov, Oleg A.; Yoshikawa, Nobuyuki; Nevirkovets, I. P.; Hidaka, Mutsuo

doi:10.1007/978-3-030-20726-7_16

Cited by 6 publications

(4 citation statements)

References 256 publications

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“…Josephson devices can be divided into two categories: flux transfer and voltage transfer devices. Among the first ones, AQFP devices [9] exploit adiabatic switching in the logic operation to drastically reduce the dynamic energy consumption of conventional superconducting devices. Superconducting adiabatic devices are realized by operating the Quantum Flux Parametron (QFP) [10] in adiabatic mode.…”

Section: Introductionmentioning

confidence: 99%

Majority-based Design Flow for AQFP Superconducting Family

Meuli

Possani

Singh

et al. 2022

2022 Design, Automation &Amp; Test in Europe Conference &Amp; Exhibition (DATE)

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Adiabatic superconducting devices are promising candidates to develop high-speed/low-power electronics. Advances in physical technology must be matched with a systematic development of comprehensive design and simulation tools to bring superconducting electronics to a commercially viable state. Being the technology fundamentally different from CMOS, new challenges are posed to design automation tools: library cells are controlled by multi-phase clocks, they implement the majority logic function, and they have limited fanout. We present a product-level RTL-to-GDSII flow for the design of Adiabatic Quantum-Flux-Parametron (AQFP) electronic circuits, with a focus on the special techniques used to comply with these challenges. In addition, we demonstrate new optimization opportunities for graph matching, resynthesis, and buffer/splitter insertion, improving the state-of-the-art.

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Section: Introductionmentioning

confidence: 99%

Majority-based Design Flow for AQFP Superconducting Family

Meuli

Possani

Singh

et al. 2022

2022 Design, Automation &Amp; Test in Europe Conference &Amp; Exhibition (DATE)

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“…Born et al 13) and Zangerle et al 14) inserted an SCPT in a superconducting loop and measured the state of the SCPT itself as a charge-phase qubit at tens of MHz range on the basis of the theoretical analysis by Zorin. 15,16) On the other hand, the magnitude of the supercurrent which can flow through an SCPT is typically smaller than 100 nA [17][18][19][20][21] and by orders of magnitude smaller than those in the other superconducting electronics technologies such as single-flux-quantum circuits, 22) superconducting quantum interference device electronics 23) etc. In order to combine an SCPT with other superconducting electronics, it is desirable to increase the magnitude of the modulable supercurrent through it.…”

Section: Introductionmentioning

confidence: 99%

Scalability of supercurrent modulable with single Cooper-pair transistors connected in parallel

Tanarom¹,

Mizugaki²,

Shimada³

2021

Jpn. J. Appl. Phys.

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A single Cooper-pair transistor (SCPT) can work as a fast supercurrent switch. However, a direct combination of an SCPT with other superconducting-electronics circuits is not easy because of the smallness of the switchable supercurrent with it. In this work, scalability of the supercurrent that can be modulated with an SCPT structure is studied using multiple SCPTs connected in parallel having a common gate electrode. It is found that the magnitude of the maximum supercurrent is scaled up almost linearly with the increase in the number of SCPTs, N, and that it is modulated with the gate voltage as in the case for a single SCPT. The modulability, however, decreases with the increase in N, which is demonstrated to be mostly because of the charge-state fluctuations of either islands of the constituent SCPTs caused by the capacitive coupling among them. A practically possible method of improving the modulability is also discussed.

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“…In the former state, the modulation pattern of the Josephson critical current, Ic, in the magnetic field, H, may acquire minimum near H=0, and restores its usual shape with maximum in the second state. These states can be used for building a compact cryogenic memory compatible with single flux quantum electronics.In recent years, a significant research effort has been dedicated for development of cryogenic memory for use in the single flux quantum (SFQ) circuits [1,2]. Under the recent IARPA C3 program [3,4], several potential memory technologies were investigated [5][6][7][8][9][10][11][12][13].…”

mentioning

confidence: 99%

“…In recent years, a significant research effort has been dedicated for development of cryogenic memory for use in the single flux quantum (SFQ) circuits [1,2]. Under the recent IARPA C3 program [3,4], several potential memory technologies were investigated [5][6][7][8][9][10][11][12][13].…”

mentioning

confidence: 99%

Electrically controlled hybrid superconductor–ferromagnet cell for high density cryogenic memory

Nevirkovets

Mukhanov

2023

Applied Physics Letters

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We report the fabrication and testing, at 4.2 K, of an S1IS2FS3 device, where S, F, and I denote a superconductor (Nb), a ferromagnetic material (Permalloy), and an insulator (AlOx), respectively. The F layer covers about one half of the top electrode of the S1IS2 Josephson junction and is positioned off-center. Electric current, Itr, along the S3 electrode can change the magnetization of the F layer in such a way that, for one direction of Itr, a magnetic flux penetrates the junction perpendicular to the layers, whereas for the opposite direction, the perpendicular magnetic flux can be removed. In the former state, the modulation pattern of the Josephson critical current, Ic, in the magnetic field, H, may acquire minimum near H = 0 and restores its usual shape with maximum in the second state. These states can be used for building a compact cryogenic memory compatible with single flux quantum electronics.

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Josephson Junctions for Digital Applications

Cited by 6 publications

References 256 publications

Majority-based Design Flow for AQFP Superconducting Family

Majority-based Design Flow for AQFP Superconducting Family

Scalability of supercurrent modulable with single Cooper-pair transistors connected in parallel

Electrically controlled hybrid superconductor–ferromagnet cell for high density cryogenic memory

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