Physics – Quantum Physics
Scientific paper
2004-05-17
Physics
Quantum Physics
12 pages, 9 figures, accepted for publication in the Journal of Optics B - Quantum and Semiclassical Optics
Scientific paper
10.1088/1464-4266/6/7/012
Various phase shifters and absorbers can be put into the arms of a double loop neutron interferometer. The mean intensity levels of the forward and diffracted beams behind an empty four plate interferometer of this type have been calculated. It is shown that the intensities in the forward and diffracted direction can be made equal using certain absorbers. In this case the interferometer can be regarded as a 50/50 beam splitter. Furthermore the visibilities of single and double loop interferometers are compared to each other by varying the transmission in the first loop using different absorbers. It can be shown that the visibility becomes exactly 1 using a phase shifter in the second loop. In this case the phase shifter in the second loop must be strongly correlated to the transmission coefficient of the absorber in the first loop. Using such a device homodyne-like measurements of very weak signals should become possible.
Peev Momtchil
Rauch Helmut
Suda Martin
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