Logic design of Josephson network

Nakajima, Koji; Onodera, Y.; Ogawa, Yohei

doi:10.1063/1.322782

Cited by 118 publications

(43 citation statements)

References 12 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Various applications to plasmonics 33 , as well as new strategies for optical control of superconductivity, can be predicted from our work. We recall that the control of flux-carrying phase kinks has been considered in conventional Josephson junctions for information transport and storage 34,35 , for which currents were used as a means to control a fluxon shift register. Here, we demonstrate how such flux carriers can be driven and detected by light.…”

mentioning

confidence: 99%

Optical excitation of Josephson plasma solitons in a cuprate superconductor

et al. 2013

View full text Add to dashboard Cite

Josephson plasma waves are linear electromagnetic modes that propagate along the planes of cuprate superconductors, sustained by interlayer tunnelling supercurrents. For strong electromagnetic fields, as the supercurrents approach the critical value, the electrodynamics become highly nonlinear. Josephson plasma solitons (JPSs) are breather excitations predicted in this regime, bound vortex-antivortex pairs that propagate coherently without dispersion. We experimentally demonstrate the excitation of a JPS in La 1.84 Sr 0.16 CuO 4 , using intense narrowband radiation from an infrared free-electron laser tuned to the 2-THz Josephson plasma resonance. The JPS becomes observable as it causes a transparency window in the opaque spectral region immediately below the plasma resonance. Optical control of magnetic-flux-carrying solitons may lead to new applications in terahertz-frequency plasmonics, in information storage and transport and in the manipulation of high-T c superconductivity.T erahertz-frequency nonlinear optics holds great potential for device applications in data storage and manipulation at high bit rates, as well as for applications in the coherent control of matter. New tabletop and accelerator-based sources, which generate electric fields at megavolt per centimetre strengths, are opening up new opportunities in this area. Recent advances have relied on direct control of selected vibrational resonances 1-6 or on the use of field enhancement in metamaterial structures 7 . In cuprate superconductors, direct excitation of the order-parameter phase has been shown to modulate the superfluid density on the ultrafast timescale 8 , effectively demonstrating non-dissipative routes to control the macroscopic state of the solid.Here, the terahertz nonlinear optics of cuprate superconductors is studied experimentally and theoretically in the general case in which nonlinear propagation effects are combined with the local response of ref. 8. The intrinsic nonlinearity of interlayer tunnelling is shown to generate solitonic modes that concentrate the electromagnetic energy in space and time, propagating without distortion inside the material.The terahertz-frequency electrodynamics of cuprate superconductors are, for fields polarized perpendicular to the planes, dominated by superconducting tunnelling between layers 9 . Cuprates are in fact stacks of extended Josephson junctions 10,11 , with distributed tunnelling inductance L J (x, y, t ) between capacitively coupled planes (x and y are the spatial coordinates in the planes and t is time).For low fields, L J is independent of space and time and a single Josephson plasma resonance (JPR) is found at ω JPR = 2π/ √ L J C (C is the equivalent capacitance of the planes, which is assumed to be constant in space and time). In most cuprates, ω JPR ranges between gigahertz (refs 12,13) and terahertz (ref. 14) frequencies. As characteristic for a plasmonic response, the superconductor is transparent and frequency dispersive for ω > ω JPR and has unity reflectivity for ω < ω JPR ....

show abstract

mentioning

confidence: 99%

Optical excitation of Josephson plasma solitons in a cuprate superconductor

et al. 2013

View full text Add to dashboard Cite

show abstract

“…an SFQ as an information carrier, though there are several types of SFQ circuits. In the original concept, the binary signal is obtained by recognizing the presence or absence of an SFQ in the loop [5]. In order to make an SFQ enter or leave the loop one at a time, superconducting weaklinks have to be inserted into the loop.…”

Section: Rapid Single Flux Quantum Circuitsmentioning

confidence: 99%

“…Both the macroscopic quantum effects and low surface resistances are essential for the single flux quantum (SFQ) logic circuits [5,6]. Integrated circuits (ICs) of the SFQ logic circuits have been demonstrated, and these SFQ-ICs have started to be applied to the radio receivers, superconductor detector array systems or computers because of their features of low power consumption, high-speed operation, etc.…”

Section: Introductionmentioning

confidence: 99%

Advancement of superconductor digital electronics

Fujimaki

2012

IEICE Electron. Express

View full text Add to dashboard Cite

Advancement of superconductor digital electronics, especially Rapid Single Flux Quantum (RSFQ) logic circuit is described. Ultra short pulse of a voltage generated across a Josephson junction and release from charging/discharging process for signal transmission in RSFQ circuits enable us to reduce power consumption and gate delay. The power-delay products (PDPs) of RSFQ integrated circuits (ICs) are 4 or 5 orders of magnitude smaller than those of semiconductor ICs. The fabrication process technology and the related designing technology have been advanced, and RSFQ ICs have been applied to software-defined radio receivers, superconductor detector array systems, and supercomputers. Recently, several kinds of energy-efficient single flux quantum circuit have been proposed to obtain further advantage to semiconductor devices. The PDPs of these circuits become at least 1 order smaller than those of conventional RSFQ circuits. Keywords: single flux quantum, superconductor, energy efficiency, high-speed, power-delay product Classification: Superconducting electronics References

show abstract

“…29 At the same time in Japan, a group at Tohoko University was developing what would become known as "phase-mode logic". 30 ' 31 Although all are based on SFQ pulses, none of these approaches adequately defined a convenient manner for coding binary data onto and extracting it from the magnetic flux quanta in the circuit. A primary contribution of the RSFQ approach was to define a convention for the logical representation of single flux quantum "l"s and "0"s. This made RSFQ a synchronous (clocked) logic, departing from the traditional combinatorial Boolean logic style.…”

Section: Magnetic Flux Quanta As Binary Datamentioning

confidence: 99%

RSFQ Technology: Circuits and Systems

Brock

2001

Int. J. Hi. Spe. Ele. Syst.

View full text Add to dashboard Cite

Rapid Single-Flux-Quantum (RSFQ) logic is a superconductor IC technology that, with only a modest number of researchers worldwide, has produced some of the world's highest performance digital and mixed-signal circuits. This achievement is due, in part, to a constellation of characteristics that manifest themselves at the circuit level -namely, highspeed digital logic at low-power, ideal interconnects, quantum accuracy, scalability, and simplicity of fabrication. A necessary key to translating these advantages to the systemlevel involves understanding the I/O, synchronization, and packaging issues associated with a cryogenic technology. The objective of this paper is to review the status of current RSFQ circuit-level infrastructure components and their potential impact on system-level applications.

show abstract

Logic design of Josephson network

Cited by 118 publications

References 12 publications

Optical excitation of Josephson plasma solitons in a cuprate superconductor

Optical excitation of Josephson plasma solitons in a cuprate superconductor

Advancement of superconductor digital electronics

RSFQ Technology: Circuits and Systems

Contact Info

Product

Resources

About