Physics – Quantum Physics
Scientific paper
1997-01-09
Physics
Quantum Physics
11 pages, LateX, no figures. Published in "Quantum Communication,Computing, and Measurement", Edited by O. Hirota, A. S. Holev
Scientific paper
Homodyne tomography - i. e. homodyning while scanning the local oscillator phase - is now a well assessed method for ``measuring'' the quantum state. In this paper I will show how it can be used as a kind of universal detection, for measuring generic field operators, however at expense of some additional noise. The general class of field operators that can be measured in this way is presented, and includes also operators that are inaccessible to heterodyne detection. The noise from tomographical homodyning is compared to that from heterodyning, for those operators that can be measured in both ways. It turns out that for some operators homodyning is better than heterodyning when the mean photon number is sufficiently small. Finally, the robustness of the method to additive phase-insensitive noise is analyzed. It is shown that just half photon of thermal noise would spoil the measurement completely.
No associations
LandOfFree
Homodyning as universal detection does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Homodyning as universal detection, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Homodyning as universal detection will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-619283