78 citations · 281 across the 23 of their papers we have counts for
3 papers · 2 filters
Direct method for measuring and witnessing quantum entanglement of arbitrary two-qubit states through Hong-Ou-Mandel interference
Karol Bartkiewicz, Grzegorz Chimczak, Karel Lemr
We describe a direct method for experimental determination of the negativity of an arbitrary two-qubit state with 11 measurements performed on multiple copies of the two-qubit syst…
Creating a switchable optical cavity with controllable quantum-state mapping between two modes
Grzegorz Chimczak, Karol Bartkiewicz, Zbigniew Ficek +1
We describe how an ensemble of four-level atoms in the diamond-type configuration can be applied to create a fully controllable effective coupling between two cavity modes. The dia…
Experimental quantum forgery of quantum optical money
Karol Bartkiewicz, Antonín Černoch, Grzegorz Chimczak +3
Unknown quantum information cannot be perfectly copied (cloned). This statement is the bedrock of quantum technologies and quantum cryptography, including the seminal scheme of Wie…