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 language | English |
---|---|
Pages (from-to) | 1457-1459 |
Number of pages | 3 |
Journal | Science |
Volume | 293 |
Issue number | 5534 |
DOIs | |
State | Published - Aug 24 2001 |