Polarization ququarts
Yu. I. Bogdanov, E. V. Moreva, G. A. Maslennikov, R. F. Galeev, S. S. Straupe, S. P. Kulik
Abstract
We discuss the concept of polarization states of four-dimensional quantum systems based on frequency non-degenerate biphoton field. Several quantum tomography protocols were developed and implemented for measurement of an arbitrary state of ququart. A simple method that does not rely on interferometric technique is used to generate and measure the sequence of states that can be used for quantum communication purposes.
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