Nondemolition polarization measurement

The standard measurement of different properties of quantum electromagnetic radiation is based on the photodetection, which is field destructive. Following our consideration of the possibility of the Aharonov-Bohm effect at optical frequencies [100], we propose here a new nondemolition method of polarization measurement in which the linearly polarized longitudinal mode of the field is detected without any perturbation of its quantum state (Section VI.D). The estimation of physical conditions shows that such a measurement can be done either for the photons propagating through the fiber, or for the superradiant photons in radioband frequencies. 

Thus, the linearly polarized longitudinal component of electromagnetic radiation arising in corresponding geometry (fiber or localized source) can be measured in nondemolition way with the aid of the Aharonov-Bohm effect at optical frequencies. 

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