Physics – Quantum Physics
Scientific paper
1999-04-13
J.Opt.B Quant.Semiclass.Opt. 2 (2000) 245-251
Physics
Quantum Physics
8 pages, REVTeX. More info on http://www.ligo.caltech.edu/~cbrif/science.html
Scientific paper
10.1088/1464-4266/2/3/305
We consider how the conventional spectroscopic and interferometric schemes can be rearranged to serve for reconstructing quantum states of physical systems possessing SU(2) symmetry. The discussed systems include a collection of two-level atoms, a two-mode quantized radiation field with a fixed total number of photons, and a single laser-cooled ion in a two-dimensional harmonic trap with a fixed total number of vibrational quanta. In the proposed rearrangement, the standard spectroscopic and interferometric experiments are inverted. Usually one measures an unknown frequency or phase shift using a system prepared in a known quantum state. Our aim is just the inverse one, i.e., to use a well-calibrated apparatus with known transformation parameters to measure unknown quantum states.
Brif Constantin
Mann Adam
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