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4 papers · 2 filters
Knowing "where the photons have been"
Karol Bartkiewicz, Antonín Černoch, Dalibor Javůrek +3
Linear-optical interferometers play a key role in designing circuits for quantum information processing and quantum communications. Even though nested Mach-Zehnder interferometers…
Experimental implementation of optimal linear-optical controlled-unitary gates
Karel Lemr, Karol Bartkiewicz, Antonín Černoch +2
We show that it is possible to reduce the number of two-qubit gates needed for the construction of an arbitrary controlled-unitary transformation by up to two times using a tunable…
Luminescence-induced noise in single photon sources based on BBO crystals
Radek Machulka, Karel Lemr, Ondřej Haderka +3
Single-photon sources based on the process of spontaneous parametric down-conversion play a key role in various applied disciplines of quantum optics. We characterize intrinsic lum…
Using quantum routers to implement quantum message authentication and Bell-state manipulation
Karol Bartkiewicz, Antonín Černoch, Karel Lemr
In this paper we investigate the capability of quantum routing (quantum state fusion) to implement two useful quantum communications protocols. The analyzed protocols include quant…