Quantum Dynamics of a d-Wave Josephson Junction

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Science  06 Jan 2006:
Vol. 311, Issue 5757, pp. 57-60
DOI: 10.1126/science.1120793

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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.

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