MQC Publications

2006

Investigation of Josephson interferometer potentials by ac excitations
M. Cirillo, P. Carelli, M. G. Castellano, F. Chiarello, C. Cosmelli, N. Grønbech-Jensen, R. Leoni, J. E. Marchese, F. Mattioli, D. Simeone, G. Torrioli
Physica C 437, 46 (2006),

2005

Decoherence in a superconducting quantum bit circuit
G. Ithier, E. Collin, P. Joyez, P. J. Meeson, D. Vion, D. Esteve, F. Chiarello, A. Shnirman, Y. Makhlin, J. Schriefl, and G. Schön
Phys. Rev. B 72, 134519 (2005).

Superconducting tunable flux qubit with direct readout scheme
Fabio Chiarello, Pasquale Carelli, Maria Gabriella Castellano, Carlo Cosmelli, Lorenzo Gangemi, Roberto Leoni, Stefano Poletto, Daniela Simeone, and Guido Torrioli
Supercond. Sci. Technol. 18, 1370 (2005).

A New Flux/Phase Qubit With Integrated Readout
Maria Gabriella Castellano, Fabio Chiarello, Roberto Leoni, Guido Torrioli, Pasquale Carelli, Carlo Cosmelli, Marilena Di Bucchianico, Francesco Mattioli, Stefano Poletto, and Daniela Simeone
IEEE trans. on Appl. Supercond. 15, 849 (2005).

Variable transformer for controllable flux coupling
M. G. Castellano, F. Chiarello, R. Leoni, D. Simeone, G. Torrioli, C. Cosmelli, P. Carelli
Applied Physics Letters 86, 152504 (2005)

2004

Microwave-induced thermal escape in Josephson junctions
N. Gr?nbech-Jensen, M.G. Castellano, F. Chiarello, M. Cirillo, C. Cosmelli, L.V. Filippenko, R. Russo, and G. Torrioli
Phys. Rev. Lett. 93, 107002 (2004)

Realization and characterization of a SQUID flux qubit with direct readout scheme
F. Chiarello, M.G. Castellano, R. leoni, G. Torrioli, C. Cosmelli, P. Carelli
Proceedings MQC2 Conference, Naples, 2004

Anomalous thermal escape statistics in Josephson systems perturbed by microwaves
Niels Groenbech-Jensen, M.G. Castellano, F. Chiarello, M. Cirillo, C. Cosmelli, L. V. Filippenko, R. Russo, G. Torrioli
Proceedings MQC2 Conference, Naples, 2004

Laser switch for stroboscopic read-out of magnetic flux
Marco Ferrara, Pasquale Carelli, Fabio Chiarello, Maria Gabriella Castellano, and Guido Torrioli, Carlo Cosmelli
Review of Scientific Instruments 75, 2116 (2004)

I dispositivi a singolo elettrone e le loro applicazioni
M.G. Castellano
Nanotec-IT newsletter n.2, ottobre 2004, p. 19

Doped silicon and NIS junctions for bolometer applications
R. Leoni, B. Buonomo, G. Castellano, F. Mattioli, G. Torrioli, L. Di Gaspare, F. Evangelisti
Nucl. Instr. and Methods in Phys. Res. A 520, 44-47 (2004).

2003

Tracing the characteristics of a flux qubit with a hysteretic dc-superconducting quantum interference device comparator
M. G. Castellano, F. Chiarello, R. Leoni, D. Simeone, G. Torrioli, C. Cosmelli, R. Buttiglione, S. Poletto, P. Carelli
J. Appl. Phys. 94, 7935-7937 (2003)

Quantum dynamics of a microwave driven SQUID
C. Cosmelli, P. Carelli, M.G. Castellano, F. Chiarello, G. Diambrini Palazzi, M. Di Bucchianico, R. Leoni, S.Poletto, G. Torrioli
Superconductor Science and Technology 16, 1337-1339 (2003)

Macroscopic Quantum Behavior of Superconducting Quantum Interference Devices
M. G. Castellano
Fortschr. Phys. 51, 288-294 (2003)

2002

Stroboscopic single-shot detection of the flux state in a radio frequency superconducting quantum interference device
C. Cosmelli, F. Sciamanna, M. G. Castellano, R. Leoni, and G. Torrioli, P. Carelli and F. Chiarello
Appl. Phys. Lett. 80, 3150-3152 (2002)

Test of a rf SQUID system with stroboscopic one-shot read-out under microwave irradiation
P. Carelli, M.G. Castellano, F. Chiarello, C. Cosmelli, R. Leoni, F. Sciamanna, G. Torrioli
III int. workshop on Macroscopic Quantum Coherence and Quantum Computing, 3-7 June, 2002, Napoli

2001

Superconducting devices for quantum logic gates using magnetic flux states
M. G. Castellano, F. Chiarello
Proc. of International School of Physics “Enrico Fermi”, CXLVIII course on Experimental Quantum Computation and Information [Varenna, 17 - 27 July 2001], IOS Press (2002)), p. 493-510

An integrated system of SQUIDs for the study of macroscopic quantum coherence
C. Cosmelli, M. G. Castellano, R. Leoni, G. Torrioli, P. Carelli, F. Chiarello
Supercond. Sci. Technol. 14, 1031 (2001)

Characterization of superconducting devices spanning the charging to Josephson regimes
M. G. Castellano, R. Leoni, G. Torrioli, B. Buonomo, D. Simeone, P. Carelli, F. Chiarello, F. Mattioli, C. Cosmelli
Supercond. Sci. Technol. 14, 1156 (2001)

Aluminum single electron transistors studied at 0.3 K in different transport regimes
B. Buonomo, M. G. Castellano, R. Leoni, F. Mattioli, G. Torrioli, P. Carelli, F. Chiarello, C. Cosmelli
J. Applied Physics 89, 6545 (2001)

Noise measurements of a superconducting single electron transistor at T=0.3K
B. Buonomo, P. Carelli, M.G. Castellano, F. Chiarello, C. Cosmelli, R. Leoni and G. Torrioli
Macroscopic Quantum Coherence and Quantum Computing, Ed. D.V. Averin, B. Ruggiero, P. Silvestrini, Kluvert Academic Plenum Publishers, p.173 (2001)

Superconducting devices to test Macroscopic Quantum Coherence on the flux states of an rf SQUID
C. Cosmelli, P. Cappelletti, P. Carelli, M.G. Castellano, F. Chiarello, G. Diambrini Palazzi, R. Leoni, N. Milanese, G. Torrioli
Macroscopic Quantum Coherence and Quantum Computing, Ed. D.V. Averin, B. Ruggiero, P. Silvestrini, Kluvert Academic Plenum Publishers, p. 73 (2001)

SQUID systems for Macroscopic Quantum Coherence and Quantum Computing
P. Carelli, M.G. Castellano, F. Chiarello, C. Cosmelli, R. Leoni, G. Torrioli
IEEE Trans. on Applied Superconductivity 11, 210 (2001)

A hysteretic dc-SQUID for non invasive measurements of the flux states of an rf-SQUID
C. Cosmelli, M.G. Castellano, P. Carelli, F. Chiarello, R. Leoni, G. Torrioli
IEEE Trans. on Applied Superconductivity 11, 990 (2001)

2000

SQUIDs for macroscopic quantum coherence experiments
M. G. Castellano and MQC collaboration
Future Perspectives of Superconducting Josephson Devices, EuroConference on Physics and Application of Multi-Junctions Superconducting Josephson Devices -Maratea, 1-6 July 2000

Escape from the zero-voltage state in hysteretic dc-SQUID with different dimensionless inductance
M. G. Castellano, A. Intelisano, R. Leoni, N. Milanese, G. Torrioli, C. Cosmelli, P. Carelli, F. Chiarello
International Journal of Modern Physics B, 14, 3056 (2000)

A single electron transistor in the superconducting state
R. Leoni, M. G. Castellano, C. Pasqui, G. Torrioli, P. Carelli, F. Chiarello, C. Cosmelli
Sensors and microsystems, Proceedings of the 5th Italian Conference, Ed. C. Di Natale, A. D’Amico and P. Siciliano, World Scientific, Singapore, pp. 317-321 (2000)

1999

A SQUID Switch for a Macroscopic Quantum Coherence Experiment
M. G. Castellano, G. Torrioli, F. Chiarello, C. Cosmelli, P. Carelli
Inst. Phys. Conf. Ser., 167, 593 (1999)

Experimental evaluation of the instrinsic dissipation from energy-level quantization in Josephson devices
C. Cosmelli, P. Carelli, M.G. Castellano, F. Chiarello, R. Leoni, B. Ruggiero, P. Silvestrini, G. Torrioli
J. of Superconductivity 12, 773-781 (1999)

Return current in hysteretic Josephson junctions: Experimental distribution in the thermal activation regime
M.G. Castellano, G. Torrioli, F. Chiarello, C. Cosmelli, P. Carelli
Journal Applied Physics 86, 6405-6411 (1999)

Measurements of the Decoherence Time from Energy Level Quantization in Josephson Junctions and rf SQUIDs
Carlo Cosmelli, Fabio Chiarello, Gianluca D’Agosta, Maria Gabriella Castellano, Guido Torrioli
IEEE Trans. on Appl. Supercond. 9, 4123-4126 (1999)

Energy levels quantization in underdamped Niobium Josephson junctions
B. Ruggiero, C. Granata, E. Esposito, V. G. Palmieri, M. G. Castellano, C. Cosmelli, M. Russo, P. Silvestrini
IEEE Trans. on Appl. Supercond. 9, 3978-3981 (1999)

Measurement of the intrinsic dissipation of a macroscopic system in the quantum regime
P. Carelli, M.G. Castellano, F. Chiarello, C. Cosmelli, G. Diambrini-Palazzi, R. Leoni, G. Torrioli
Physical Review Letters 82, 5357-5360 (1999)

Effects of Energy Level Quantization on the Supercurrent Decay of Josephson Junctions
B. Ruggiero, M. G. Castellano, G. Torrioli, C. Cosmelli, F. Chiarello, V.G. Palmieri, C. Granata, P. Silvestrini
Phys. Rev. B 59, 177-180 (1999)

1998

Measurements of thermal switching between metastable flux states in a rf-SQUID with intermediate damping
M.G.Castellano, R.Leoni, G.Torrioli, C.Cosmelli, F.Chiarello, P. Carelli
Appl. Superconductivity 5, 405-411 (1998)

Towards an experiment of MQC: determination of the decoherence time from energy level quantization in rf SQUIDs
C. Cosmelli, P. Carelli, M. G. Castellano, F. Chiarello, R. Leoni, G. Torrioli
Quantum Coherence and Decoherence - ISQM, Ed. Y.A. Ono and K. Fujikawa, Elsevier Science B. V., Tokyo, pp. 245-248 (1998)

1997

The return current in hysteretic Nb/AlOx/Nb Josephson junctions: experimental distribution in thermal activation regime, with an applied magnetic field
M. G. Castellano, G. Torrioli, C. Cosmelli, F. Chiarello, P. Carelli
ISEC ’97, 6th International Superconductive Electronics Conference, Ed. H. Koch and S. Knappe, PTB, Berlin, pp.194-196 (1997)

Measurements of thermal switching between metastable flux states in a rf-SQUID with intermediate damping
M. G. Castellano, R. Leoni, G. Torrioli, C. Cosmelli, F. Chiarello, P. Carelli
ISEC ’97, 6th International Superconductive Electronics Conference, Ed. H. Koch and S. Knappe, PTB, Berlin, pp.92-94 (1997)

Development and test of Josephson devices for an experiment of Macroscopic Quantum Coherence
P. Carelli, M.G.Castellano, C. Cosmelli, R. Leoni, G. Torrioli
Il Nuovo Cimento D 19, 1423-1428 (1997)

Magnetic field dependence of thermal excitations in Josephson junctions
M.G. Castellano, C. Cosmelli, G. Torrioli, P. Carelli, G. Rotoli, M. Cirillo
IEEE Trans. on Applied Superconductivity 7, 2430-2433 (1997)

The effective dissipation in Nb/AlOx/Nb Josephson junctions by return current measurements
R. Cristiano, L. Frunzio, C. Nappi, M. G. Castellano, G. Torrioli, C. Cosmelli
J. Appl. Phys. 81, 7418-7426 (1997)

1996

Thermally activated escape from the zero-voltage state in long Josephson junctions
M.G. Castellano, G. Torrioli, C. Cosmelli, A. Costantini, F. Chiarello, P. Carelli, G. Rotoli, M. Cirillo, R.L. Kautz
Phys. Rev. B 54, 15417-28 (1996)

Switching dynamics of Nb/AlOx/Nb Josephson junctions: measurements for an experiment of Macroscopic Quantum Coherence
M.G. Castellano, R. Leoni, G. Torrioli, F. Chiarello, C. Cosmelli, A. Costantini, G. Diambrini-Palazzi, P. Carelli, R. Cristiano, L. Frunzio
J. Appl. Phys. 80, 2922-8 (1996)

1995

Low temperature behaviour of Josephson junctions for the MQC (Macroscopic Quantum Coherence) experiment
C. Cosmelli, G. Diambrini-Palazzi, F. Chiarello, A. Costantini, M.G. Castellano, R. Leoni, G. Torrioli, P. Carelli, R. Cristiano, L. Frunzio
Applied Superconductivity 1995. Proceedings of EUCAS 1995, the Second European Conference on Applied Superconductivity, IOP, Bristol, UK, pp. 1323-6 (1995)

MQC: an experiment for detecting macroscopic quantum coherence with a system of SQUIDs
P.Carelli, M.G.Castellano, F.Chiarello, L.Chiatti, M.Cirillo, C.Cosmelli, G.Diambrini-Palazzi, D.Fargion, R.Leoni, G.Rotoli, F.Scaramuzzi, G.Torrioli, A.Zirizzotti
Fundamental Problems in Quantum Mechanics, Ed. D.Greenberger and A.Zeilinger, Proc. of New York Academy of Sciences, New York, p.845 (1995)

1994

Tunnelling in a Double-Well SQUID Potential
G. Rotoli and P. Carelli
Proc. of International workshop on Long Josephson Junctions, Capri, 10-15 June 1994.

1993

Proposal of an Experiment for Detecting Macroscopic Quantum Coherence with a System of SQUIDs
C. Cosmelli and G. Diambrini Palazzi
Proposal to INFN, Roma, September 1993, and Addendum , Roma, November 1993, unpublished.