Ulteriori informazioni
Thisvolumereportsthemajorpartofthescientificcontributionsofthefirstinternational workshoponSuperconductingNano-ElectronicsDevices(SNED)heldinNapoli,Italy,at theendofMay2001. Theaimoftheworkshopwastofocusonrecentexperimentalandtheoreticalresultsin thefieldofsuperconductingnano-electronicsdevices. Itcombinedphysicswithpresent andfuturetechnologicalapplications:bothfundamentalandappliedaspectswerecovered. SpecialemphasiswasgiventoquantumcoherenceandcomputationusingsmallJosephson junctions,noiseinultrasensitivenanodevicesandpossibilitiesofmakinguseofsupercon ductivityinvariouson-chipdevices. Withtheseattributesandwithrecognizedinvited speakersintheirspecialtiestheworkshopmanagedtobringtogetheracollectionof scientistsfromnearbybutdistinctresearchcommunities. Thiswaytheatmosphereofthe workshopbecameveryopenanddiscussionswerelivelybothduringandoutsidethe sessions. Thisfreshdiscussionhopefullygaveeveryparticipantalotofnewideasfor furtherworkbackintheirhomeinstitutes. OneofthecentraltopicsintheworkshopwastheuseofdifferentJosephsonjunction configurationsasimplementationsofquantumbits. Atthetimeoftheworkshopwewere justwaitingforthesecondwaveofbreakthroughsinthisfield:theresultsemergingfrom theparticipatinglaboratoriesoftheworkshopjustatthetimeofthewritingofthispreface perhapsalsoprovetheusefulnessofourworkshop. Anotherfocuswasonvarioustopicsrelatedtoultrasensativedetectors. Theybring quantumlimitationstoapplications,andmanydeviceconceptsareresultsofunderstanding fundamentalandexcitingphenomenainsuperconductivity. Noiseandon-chipcooling wereexplicitlydiscussedinthedetectorsessionsaswell. ThechoiceofthelocationrecognizestheroleandthetraditionsofNapoliespeciallyin thefieldofmacroscopicquantumcoherence,oneofthemainissuesoftheworkshop. It furtherguaranteedtheparticipantsastimulatingatmosphereatthemeeting. Inconclusion,wewishtothanktheIstitutoItalianopergliStudiFilosofici,theIstituto diCiberneticadelConsiglioNazionaledelleRicerche,theUniversityofJyviiskylii,the IstitutoNazionalediFisicaNucleare,theIstitutoNazionalediFisicadellaMateria,the DipartimentoScienzeFisiche,andtheRettoratodell'UniversitadiNapoli"FedericoII" fortheirsupport. ThanksarealsoduetoAirLiquide,CRY,Nanoway,OxfordInstruments, andRaith. ThisinitiativeisintheframeoftheinternationalactivityofMQC2Association on"MacroscopicQuantumCoherenceandComputing. "WeareindebtedtoC. Granata v vi PREFACE and V. Coratoforscientificassistance,andtoF. Caiazzo,E. DeGrazia,andA. M. Mazzarellafortheirvaluableassistanceinallthetasksconnectedtotheorganizationofthe Workshop. WearealsogratefultoL. Longobardi,A. Monaco,S. Piscitelli,andS. Rombetto forhintsandhelpduringtheWorkshop. ThanksareduetoL. DeFelice,S. Luongo,and V. Sindonifortheorganizationofthesocialevent. J. Pekola B. Ruggiero P. Silvestrini CONTENTS QuantumNondemolitionMeasurementsofaQubit . D. V. Averin BayesianQuantumMeasurementofaSingle-Cooper-PairQubit 11 A. Korotkov lIfNoiseinJosephsonQubits 15 E. Paladino, L. Faoro,G. Falci,and R. Fazio SwitchingCurrentsandQuasi-ParticlePoisoningintheSuperconducting SingleElectronTransistor 25 P. Agren,J. Walter,V. Sch611mann,andD. B. Haviland JosephsonSystemsforQuantumCoherenceExperiments 33 V. Corato,C. Granata, L. Longobardi,M. Russo,B. Ruggiero, andP. Silvestrini SolidStateAnalogueofDoubleSlitInterferometer. . . . . . . . . . . . . . . . . . . . . . 43 K. Yu. Arutyunov, T. T. Hongisto,andJ. P. Pekola NoiseandMicrowavePropertiesofSET-Transistors. . . . . . . . . . . . . . . . . . . . . 53 M. Ejrnres,M. T. Savolainen,andJ. Mygind UseofSmallThnnelJunctionsOperatingatT=0. 3K 63 R. Leoni,M. G. Castellano,F. Chiarello,andG. Torrioli AHystericSingleCooperPairTransistorforSingleShotReadingof 73 aCharge-Qubit A. Cottet,D. Vion,P. Joyez,D. Esteve,andM. H. Devoret SingleCooperPairElectrometerBasedonaRadio-Frequency-SQUID Scheme 87 A. B. Zorin vii viii CONTENTS PossibilityofSingle-ElectronDevicesandSuperconductingCoherence 97 Yu. A. Pashkin, Y. Nakamura,T. Yamamoto,andJ. S. Tsai Frequency-LockedCurrentofCooperP
Sommario
Quantum Nondemolition Measurements of a Qubit.- Bayesian Quantum Measurement of a Single-Cooper-Pair Qubit.- 1/f Noise in Josephson Qubits.- Switching Currents and Quasi-Particle Poisoning in the Superconducting Single Electron Transistor.- Josephson Systems for Quantum Coherence Experiments.- Solid State Analogue of Double Slit Interferometer.- Noise and Microwave Properties of SET-Transistors.- Use of Small Tunnel Junctions Operating at T = 0.3 K.- A Hysteric Single Cooper Pair Transistor for Single Shot Reading of a Charge-Qubit.- Single Cooper Pair Electrometer Based on a Radio-Frequency-SQUID Scheme.- Possibility of Single-Electron Devices and Superconducting Coherence.- Frequency-Locked Current of Cooper Pairs in Superconducting Single Electron Transistor with Ohmic Resistor.- Setup for Experiments on the Supercurrent-Phase Relation in Bloch Transistors-Status and Possible Applications.- Single-Electron Transistors in the Regime of High Conductance.- Superconducting Transistor-Edge Sensors for Time & Energy Resolved Single-Photon Counters and for Dark Matter Searches.- Optimization of the Hot-Electron Bolometer and a Cascade Quasiparticle.- Noise in Refrigerating Tunnel Junctions and in Microbolometers.- Nonequilibrium Quasiparticles and Electron Cooling by Normal Metal-Superconductor Tunnel Junctions.- Mesoscopic Josephson Junctions Coupled to Weak Coherent Fields: An Example of Reciprocal Detection.- Dynamics of Superconducting Interferometers Containing Pi-Junctions.- Superconducting Current-Phase Dependence on High-Tc Symmetrical Bicrystal Junctions.- Superconducting Quantum Detector for Astronomy and X-Ray Spectroscopy.- Lifetime of Even-Parity States of a Bloch Transistor.- Magnetic Field Dependence of Retrapping Currents in DC-SQUIDs.- Josephson versus Kondo Coupling at a Quantum Dot with Superconducting Contacts.
Riassunto
SNED Proceedings (Naples, Italy, May 28-June 1, 2001)
