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 MateriaDipartimento 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