Abstract
Methods for the enhancement of optical quantum nondemolition (QND) measurements are discussed. We review the use of meter squeezing as a QND enhancement tool and present a method of QND enhancement using an electro-optic feed-forward amplifier. By applying a linearized theory it is shown that these techniques work very well together. The combined effect of these enhancement methods is modeled for two QND systems, a squeezed light beam splitter and an optical parametric amplifier. We also discuss the conflict between the normal QND criteria and QND systems that involve noiseless amplification. We use an additional parameter to quantify the problem. A method for correcting the effects of noiseless amplification is discussed and modeled. We also discuss a special case of QND that eliminates the optical interaction between the meter and signal input beams. This system is shown to be a very effective QND device.
| Original language | English |
|---|---|
| Pages (from-to) | 4943-4950 |
| Number of pages | 8 |
| Journal | Physical Review A - Atomic, Molecular, and Optical Physics |
| Volume | 60 |
| Issue number | 6 |
| DOIs | |
| Publication status | Published - 1999 |