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The measurement method of the polarization-entangled states of biphotons using a quantum tomograph
https://doi.org/10.32446/0368-1025it.2021-10-21-27
Abstract
A statistical analysis of errors in tomographic measurements of polarization-entangled biphoton states generated by sources based on the effect of spontaneous parametric down-conversion is carried out. The level of quantum fluctuations in the coincidence scheme, which is an unavoidable source of error in tomographic measurements, is analyzed in detail. A quantum tomograph was used to measure the density matrix of the quantum polarization state of biphotons in the Bell polarization state. The errors caused by quantum fluctuations are compared with the instrumental errors. It is shown that there are no obstacles to creating a tomographic metrological stand intended for characterizing SPDC-sources generating polarization-entangled biphotons.
About the Authors
D. N. Frolovtsev
Lomonosov Moscow State University
Russian Federation
Russian Federation
Dmitry N. Frolovtsev
Moscow
S. A. Magnitskiy
Lomonosov Moscow State University
Russian Federation
Russian Federation
Sergey A. Magnitskiy
Moscow
A. V. Demin
3 All Russia Research Institute of Optophysical Measurements
Russian Federation
Russian Federation
Andrey V. Demin
Moscow
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Review
For citations:
Frolovtsev D.N., Magnitskiy S.A., Demin A.V. The measurement method of the polarization-entangled states of biphotons using a quantum tomograph. Izmeritel`naya Tekhnika. 2021;(10):21-27. (In Russ.) https://doi.org/10.32446/0368-1025it.2021-10-21-27
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