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Science 6 January 2006:
Vol. 311. no. 5757, pp. 57 - 60
DOI: 10.1126/science.1120793
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Reports

Quantum Dynamics of a d-Wave Josephson Junction

Thilo Bauch,1 Tobias Lindström,1 Francesco Tafuri,2 Giacomo Rotoli,3 Per Delsing,1 Tord Claeson,1 Floriana Lombardi1*

Here we present the direct observation of macroscopic quantum properties in an all high-critical-temperature superconductor d-wave Josephson junction. Although dissipation caused by low-energy excitations is expected to strongly suppress macroscopic quantum effects, we demonstrate energy level quantization in our d-wave Josephson junction. The result indicates that the role of dissipation mechanisms in high-temperature superconductors has to be revised, and it may also have consequences for the class of solid-state "quiet" quantum bits with superior coherence time.

1 Quantum Device Physics Laboratory, Department of Microtechnology and Nanoscience, MC2, Chalmers University of Technology, S-412 96 Göteborg, Sweden.
2 Istituto Nazionale per la Fisica della Materia–Dipartimento Ingegneria dell'Informazione, Seconda Università di Napoli, Aversa (CE), Italy.
3 Dipartimento di Ingegneria Meccanica, Energetica e Gestionale, Università of L'Aquila, Località Monteluco, L'Aquila, Italy.

* To whom correspondence should be addressed. E-mail: floriana.lombardi{at}mc2.chalmers.se

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Science. ISSN 0036-8075 (print), 1095-9203 (online)