Engineering topics
Publications and source records attributed to Kulik, S P.
We present a complete methodology for testing the performances of quantum tomography protocols. The theory is validated by several numerical examples and by the comparison with experimental results achieved with various protocols for whole families of polarization states of qubits and ququarts including pure, mixed, entangled, and separable.
The method of estimating the adequacy, completeness, and accuracy of quantum tomography protocols is generalized to the case of mixed states of polarization qubits. The efficiency of the method is illustrated based on mathematical modeling and experimental investigation of some practically important quantum tomography protocols.
We report a proof-of-principle experiment demonstrating that appropriately chosen set of Hermite-Gaussian modes constitutes a Schmidt decomposition for transverse momentum states of biphotons generated in the process of spontaneous parametric down-conversion. We experimentally realize projective measurements in the Schmidt basis and observe correlations between appropriate pairs of modes. We perform tomographical state reconstruction in the Schmidt basis, by direct measurement of single-photon density matrix eigenvalues.