In this work, we consider practical aspects of rsfq circuit design for low noise low power operation. The element structure implies that a separate unit provides. Flux qubit interaction with rapid singleflux quantum. Rapid single flux quantum rsfq shift register family. Pdf timing of multigigahertz rapid single flux quantum. Unclassified for offical use only 2 fdamental advantages of superconducting digital electronics. Read rapid single flux quantum fastpacket switching element, proceedings of spie on deepdyve, the largest online rental service for scholarly research with thousands of academic publications available at. We propose an inductanceloadbiasing method in order to reduce power consumption of rapid single flux quantum sfq. Single flux quantum sfq electronic circuits originated with the advent of rapid single flux quantum rsfq logic in 1985 and have since evolved to include more energyefficient technologies such. In rsfq logic, information is stored in the form of magnetic flux quanta and transferred in the form of single flux quantum sfq voltage pulses. W or potentially subnw power dissipation per logic gate. A dss is composed of two stacked 2junction squids sharing one sensing inductor. Rapid single flux quantum tflip flop operating up to 770. Niobium is to superconducting microelectronics what silicon is to semiconductors, said oleg mukhanov, hypres program manager for the xband adr project, who coinvented rapid single flux quantum logic, the cornerstone of digital superconductor electronics, when he was a doctoral student at moscow state university, russia, in 1985.
We present the results of an analytical study and numerical simulation of the dynamics of a superconducting threejosephsonjunction 3jj flux qubit magnetically coupled with rapid singleflux quantum rsfq logic circuit, which demonstrate the fundamental possibility of implementing the simplest logic operations at. Rapid single flux quantum rsfq logic can provide high speed, low power control of superconductive qubits based on josephson junctions. Sep 17, 2016 these pulses are of picosecond duration. Single flux quantum circuit technology and cad overview.
Rsfq deals with the generation and manipulation of magnetic flux quanta in the form of short voltage pulses across a josephson weak link. Here we report on the realization of a toggle flipflop tff based on josephson contacts between hight c and lowt c superconductors, where the polarity of the fractional flux quantum provides the internal memory. Quantum physics notes j d cresser department of physics macquarie university 31st august 2011. Jul 19, 2019 adiabatic quantum flux parametron aqfp logic is an adiabatic superconductor logic family that has been proposed as a future technology towards building extremely energyefficient computing systems. Superconducting single flux quantum circuits are disclosed herein, each having at least one josephson junction which will flip when the current through it exceeds a critical current.
Abstractdualrail logic circuit elements based on rapid single flux quantum rsfq technology have been designed and simulated. In rsfq logic, information is stored in the form of magnetic flux quanta and transferred in the form of single flux quantum. Rapid single flux quantum tflip flop operating up to 770 ghz applied superconductivity, ieee transactions on author. It has several sets of computing unit which consists of a generalpurpose microprocessor, an lsrdp and a memory. By leveraging the advances recently demonstrated in digital single flux quantum sfq circuits and using. Sample chapter is available for download in pdf format. A new josephson junction logic called rapid single flux quantum logic rsfq was introduced in 1985 by k. Rapid singlefluxquantum rsfq logic, based on the representation of digital bits by single quanta of magnetic flux in superconducting loops, may combine. Nanya research center for advanced science and technology, university of tokyo, 46 1 komaba, meguroku, tokyo 153, japan. Josephson switches of electric current 28, or optically controlled elements of rapid single flux quantum logics 29 a new research field that could be. Wo2002069498a3 rapid single flux quantum programmable. Much of the flux quantum electronics groups work can be traced back to seminal work performed by clark hamilton and others at nist in the 1980s.
The abcs of flux quantum computing in 300 words or less. A new generation of the josephson digital circuits rapid single flux quantum asfq devicesbased on overdamped externally shunted high quality. The principles and characteristics of rapid single flux quantum rsfq circuits are discussed. Single flux quantum digital devices v p koshelels institute of radio engineering and electronics, ussr academy of sciences, marx avenue 18, moscow, gsp3, ussr abstract. Academy of sciences, china 1995 a dissertation submitted in partial satisfaction of the requirements for the degree of. Sep 30, 2003 we have found that the size of some rapid singleflux quantum rsfq logic cells based on conventional 0type josephson junctions can be significantly reduced by using a. Energyspaceefficient rapid singlefluxquantum circuits. Design methodology of singlefluxquantum flipflops composed. The authors study the frequency dependent damping in rapid single flux quantum rsfq circuits as means to reduce dissipation and consequent decoherence in rsfqqubit circuits. Maria gabriella castellano 1, fabio chiarello 1, roberto leoni 1, guido torrioli 1, pasquale carelli 2, carlo cosmelli 3, marat khabipov 4, alexander b zorin 4 and dmitri balashov 4. Design of multiple fanout clock distribution network for. Theclockpulsesa 1 anda 4 arerecombinedusinganinductivemerger. Pdf single flux quantum circuit technology and cad overview. Electromagnetic analyis of photosensitive interfaces for.
Ultrasensitive analog squid front ends can be combined with. Rapid single flux quantum random access memory ieee journals. Rapid single flux quantum logic based on lectures at chalmers university of technology, sweden. Principles of superconductive devices and circuits. Rapid single flux quantum rsfq design rules for nbal2o3alnbprocess at. We have found that the size of some rapid singleflux quantum rsfq logic cells based on conventional 0type josephson junctions can be significantly reduced by using a. The alu was designed using standard cell library to be fabricated with stp2 standard 2. In electronics, rapid single flux quantum rsfq is a digital electronic device that uses. Principles of superconductive devices and circuits, 2nd edition.
We discuss the benefits of incorporating such elements in rapid single flux quantum rsfq superconducting electronic circuitry. A new design concept for the josephsonjunction random access memory ram has been developed. We report the enhanced voltage swing of a rapid single flux quantum rsfq distributed amplifier by replacing a single superconducting quantum interference device squid with a doublestacksquid dss. The proposed circuits can operate asynchronously, since dualrail data include timing information in themselves.
Compared with the simulation result of another mathematical model that is established by. In comparison with the recently suggested active switching. Mukhanov, senior member, ieee u the published version of this manuscript appeared in ieee transactions on applied superconductivity volume 21, issue 3, 760 769 \2011\ \r. A fact from rapid single flux quantum appeared on wikipedia s main page in the did you know. Rapid single flux quantum logic the rsfq logic family is constructed with damped josephson junctions, inductors superconducting and current sources. Us88784b2 method and apparatus for controlling qubits.
A methodology for designing singlefluxquantum sfq flipflops composed of both conventional 0 and. Based on these cells, the rsfq pseudo random generator is given. Numerous circuits with recordbreaking clock rates have been demonstrated in the rapid single flux quantum rsfq 4 logic family, including a static digital divider operating up to 770ghz 5, digital signal processors clocked at 2040ghz 6, 7, and a serial micro. The asynchronous rapid singleflux quantum electronics core. Josephson junctions are used in present day voltage standards. They have quantized area, which is correlated with the transmission of a single quantum of magnetic flux across a josephson junction. Much higher integration and higherspeed operation are required for commercializing the rsfq circuits in any application. T c bicrystal josephson junctions has been designed, fabricated, and experimentally tested. Timing of multigigahertz rapid single flux quantum digital circuits.
The asynchronous rapid singleflux quantum electronics a promising alternative for the development of highperformance digital circuits. Superconducting computing in largescale hybrid systems alan m. It has unique analog properties that make its control signal accurate and. Highspeed rapid single flux quantum multiplexer and demultiplexer design and testing by lizhen zheng b. A configurable logic block 10 comprising rapid single flux quantum rsfq superconducting circuitry comprises first and second input arrangements 12,14 connected to an imput selector 16. Rapidsingle flux quantum matrix multiplication circuit. Both b and s can be arbitrary and so is however, if one deals with the superconducting loop or a hole in a bulk superconductor, it turns out that the magnetic flux threading such a holeloop is quantized. The rapid single flux quantum rsfq mixedsignal technology offers a way to enhance performance and reduce complexity and cost of squid systems. Semenov state university of new york, stony brook, ny 117943800, usa, and moscow state university, moscow 119899 gsp, russia. Also known as single flux quantum or sfq jj switches sfq in or out of loop, generates. These waves were represented by the socalled wave function. Adiabatic quantum flux parametron aqfp logic is an adiabatic superconductor logic family that has been proposed as a future technology towards building extremely energyefficient computing systems. Josephson junctions act as a natural spiking neuronlike device for neuromorphic computing. Single flux quantum sfq electronic circuits originated with the advent of rapid single flux quantum rsfq logic in 1985 and have since evolved to include more energyefficient technologies such as ersfq and esfq.
Pdf rapid single flux quantum technology for squid. We present the results of an analytical study and numerical simulation of the dynamics of a superconducting threejosephsonjunction 3jj flux qubit magnetically coupled with rapid single flux quantum rsfq logic circuit, which demonstrate the fundamental possibility of implementing the simplest logic operations at. We present the design of a rapid single flux quantum n x n fastpacket tdm switching element that can be used in atm packet switches. Investigating the feasibility of using nanobridge weak links. Energyspaceefficient rapid singlefluxquantum circuits by. It combines in a unique manner the possibility of clock rates in the range well above 2050g hz with extremely low power consumption. Rapid single flux quantum devices with selective dissipation. Pdf the rapid singlefluxquantum logic rsfq presents an efficient way to achieve ultra fast digital operations.
Arbitrary quantum operations with a common coupled resonator. Rapid single flux quantum abstract a balanced current comparator based on high. Wo2002069498a3 rapid single flux quantum programmable gate. According to superconductivity theory, the magnetic flux threading a superconducting loop or a hole in a bulk superconductor cannot acquire continuous values. Toward a systematic design methodology for large multigigahertz rapid single flux quantum circuits kris gaj, quentin p. Rsfq is a highly developed family that operates at clock speeds of 100 ghz. Rapid single flux quantum circuit applications abstract rapid single flux quantum rsfq circuit tec hnique is officially re cognized to be a key component of the midterm future of digita l electronics 1.
Rapid singlefluxquantum dualrail logic for asynchronous. Rapid single flux quantum dualrail logic for asynchronous circuits m. Rapid single flux quantum fastpacket switching element rapid single flux quantum fastpacket switching element zinoviev, dmitry y. Rapid singleflux quantum control of the energy potential in a double squid qubit circuit. Rapid single flux quantum rsfq er en digital elektronikteknologi, som benytter kvantemekaniske effekter i superledende materialer til at skifte signaler i stedet for transistorer og elektronror. Likharev department of physics state university of new york stony brook, ny 117943800 u. The circuit is designed in such a way that the outputjunctionj 1. Any rsfq cell can only drive one other cell and for a larger fanout splitter cells are to be used. Rapid singlefluxquantum circuits for low noise mk operation. Rapidsinglefluxquantum matrix multiplication circuit. In electronics, rapid single flux quantum rsfq is a digital electronic device that uses superconducting devices, namely josephson junctions, to process digital signals. We demonstrate rapid single flux quantum rsfq circuits with reduced energy consumption by lowering the driving voltages and critical currents of josephson junctions jjs. We describe recent topics of rapid single flux quantum rsfq circuits. Possible applications of this new digital technology are discussed.
We present a concept of an advanced rapid single flux quantum rsfq logic circuit family using the combination of 0shifted and. Since its invention in 1985, rapid or resistive until 1987 single flux quantum rsfq logic family has been dominant superconductive digital technology. Investigating the feasibility of using nanobridge weak. Circuits quantarctic flux quantum architectures, tools. Rapid single flux quantum rsfq technology has been proposed as control electronics for superconducting quantum bits because of the material and working temperature compatibility. Motivation rsfq circuits are made of shunted josephson junctions and inductances. Static power dissipation of standard rsfq logic, associated with dc bias. The coalition for the commercial application of superconductors ccas is a memberdriven, nonprofit 501c6 organization, initially formed in 1987 to represent superconductivity stakeholders in the united states. Rapid singleflux quantum control of the energy potential. Flux qubit interaction with rapid singleflux quantum logic.
Rapid single flux quantum rsfq shift register family applied super conductivity, ieee transactions on author. About qmap or there is a life under the shadow of cmos whats in it for me. The parallel architecture allows the simpler structure than koggestone while maintaining the good latency. Today, with our advanced fabrication done in the nist boulder microfabrication facility we can design larger josephson junction jj circuits with higher yield and faster speeds. Recent progress in rapidsinglefluxquantum circuits. Single flux quantum circuits northrop grumman systems. We propose a deskside supercomputer with largescale reconfigurable datapaths lsrdps using superconducting rapid single flux quantum rsfq circuits. We investigated the implementation of a storage loop, which can store flux quantum and is indispensable to express binary logic states in superconductor logic circuits. At lowered voltages, the energy statically consumed by bias resistors which is dominant in rsfq circuits is reduced. Nakagawa electrotechnical laboratory, 11 4 umezono, tsukuba, ibaraki 305, japan y. Rapid single flux quantum technology for squid applications. Rapid singlefluxquantum rsfq technology has been proposed. The rapid singlefluxquantum logic rsfq presents an efficient way to achieve ultra fast digital operations. Superconducting computing in largescale hybrid systems.
The input selector is connected to an address decoder 18 for a lookup table lut 20. No other digital technology can offer subterabitpersecond throughput while maintaining sub. Though our proposed circuit is not suitable for applications requesting highprecision, it can be realized with drastically fewer gates. Rapid single flux quantum logic rsfq moscow state university. Rapid singleflux quantum fastpacket switching element. An output of the lut is connected via an output selector 22 to output arrangements 24,26. According to these theories, we have designed rsfq inverter, xor cell and shift registers relative to the pseudo random generator. Proposal of a deskside supercomputer with reconfigurable. To satisfy this requirement, we measure several kinds of time fluctuations that possibly limit the integration level and operating speed, and introduce the flexible passive transmission line. Men det er ikke en kvantecomputerteknologi i traditionel forstand.
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