Abstract
We analyze a quantum nondemolition measurement scheme similar to that advocated by Song, Caves, and Yurke [Phys. Rev. A 41, 5261 (1990)] for generating superpositions of macroscopically distinct quantum states, but with the parametric amplifier and the back-action evader interchanged. We determine the asymptotic behavior of the output and obtain the conditions under which a superposition of two coherent states is approached. By presqueezing the signal port input, we find that gain requirements of the back-action evader are much less demanding.
| Original language | English |
|---|---|
| Pages (from-to) | 1703-1711 |
| Number of pages | 9 |
| Journal | Physical Review A |
| Volume | 42 |
| Issue number | 3 |
| DOIs | |
| State | Published - 1990 |
| Externally published | Yes |