Time-resolved measurement of dissipation-induced decoherence in a Josephson junction

S. Han, Y. Yu, X. Chu, S. I. Chu, Z. Wang

Research output: Contribution to journalArticlepeer-review

72 Scopus citations

Abstract

We determined the dissipation-induced decoherence time (DIDT) of a superconducting Josephson tunnel junction by time-resolved measurements of its escape dynamics. Double-exponential behavior of the time-dependent escape probability was observed, suggesting the occurrence of a two-level decay-tunneling process in which energy relaxation from the excited to the ground level significantly affects the escape dynamics of the system. The observation of temporal double-exponential dependence enables direct measurements of the DIDT, a property critical to the study of quantum dynamics and the realization of macroscopic quantum coherence and quantum computing. We found that the DIDT was τd > 11 μs at T = 0.55 K, demonstrating good prospects for implementing quantum computing with Josephson devices.

Original languageEnglish
Pages (from-to)1457-1459
Number of pages3
JournalScience
Volume293
Issue number5534
DOIs
StatePublished - Aug 24 2001

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