Abstract
The coherent oscillations in an individual two-state system were studied by using quantum nondemolition (QND) measurements. The technique avoids the detector backaction and overcomes the limitation on the signal-to-noise ratio of the measurement of the spectral density of the oscillation imposed by the backaction dephasing. The results showed that the backaction dephasing broadened the oscillation spectral line and limited the height of the oscillation peak with respect to the background set by the detector output noise.
| Original language | English |
|---|---|
| Article number | 207901 |
| Pages (from-to) | 2079011-2079014 |
| Number of pages | 4 |
| Journal | Physical Review Letters |
| Volume | 88 |
| Issue number | 20 |
| State | Published - May 20 2002 |
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