Stanislav Straupe

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The novel experimental realization of four-level optical quantum systems (ququarts) is presented. We exploit the polarization properties of the frequency nondegenerate biphoton field to obtain such systems. A simple method that does not rely on am interferometer is used to generate and measure the sequence of states that can be used in quantum key(More)
Transformation and detection of photons in higher-order spatial modes usually requires complicated holographic techniques. Detectors based on spatial holograms suffer from non-idealities and should be carefully calibrated. We report a novel method for analyzing the quality of projective measurements in spatial mode basis inspired by quantum detector(More)
K. S. Kravtsov,1 S. S. Straupe,2,* I. V. Radchenko,1 N. M. T. Houlsby,3 F. Huszár,3 and S. P. Kulik2 1A. M. Prokhorov General Physics Institute RAS, Moscow, Russia 2Faculty of Physics, M. V. Lomonosov Moscow State University, Moscow, Russia 3Computational and Biological Learning Laboratory, Department of Engineering, University of Cambridge, Cambridge,(More)
Spatial states of single photons and spatially entangled photon pairs are becoming an important resource in quantum communication. This additional degree of freedom provides an almost unlimited information capacity, making the development of high-quality sources of spatial entanglement a well-motivated research direction. We report an experimental method(More)
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