Measurement of the Excited-State Lifetime and Coherence Time of a Microelectronic Circuit
Abstract
We demonstrate that a microelectronic circuit, the Cooper-pair box, is a coherent, quantum two level system whose parameters can be extracted through resonant spectroscopy. The width of the resonant features implies a worst case decoherence rate of the box which is still 150 times slower than the transition rate of two level system, even though it is inhomogenously broadened. Much slower than this decoherence rate is the rate of spontaneous decay of the excited state, which we measure by resolving in time the decay of the box into its ground state with a single electron transistor. We find a spontaneous decay rate which is 10 to the 5th power times slower than the transition rate of the two-level system, even when the measurement is active. This long lifetime and the sensitivity of our measurement will permit a single-shot determination of the box's state.
Document Details
- Document Type
- Technical Report
- Publication Date
- Aug 01, 2002
- Accession Number
- ADA414293
Entities
People
- D. I. Schuster
- K. Bladh
- Konrad W. Lehnert
- L. F. Spietz
- Robert J. Schoelkopf
Organizations
- Yale University