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10 papers · 2 filters
Local Realism of Macroscopic Correlations
Ravishankar Ramanathan, Tomasz Paterek, Alastair Kay +2
We show that for macroscopic measurements which cannot reveal full information about microscopic states of the system, the monogamy of Bell inequality violations present in quantum…
Experimental Extraction of Secure Correlations from a Noisy Private State
Krzysztof Dobek, Michal Karpinski, Rafal Demkowicz-Dobrzanski +2
We report experimental generation of a noisy entangled four-photon state that exhibits a separation between the secure key contents and distillable entanglement, a hallmark feature…
Correlation complementarity yields Bell monogamy relations
P. Kurzynski, T. Paterek, R. Ramanathan +2
We present a method to derive Bell monogamy relations by connecting the complementarity principle with quantum non-locality. The resulting monogamy relations are stronger than thos…
Multiphoton resonance in a three-level system with nearly degenerate excited states
Michal Berent, Ryszard Parzyński
An analytic study is presented of the efficient multiphoton excitation and strong harmonic generation in three-level systems specified by a pair of nearly degenerate, strongly dipo…
Violation of Clauser-Horne-Shimony-Holt inequality for states resulting from entanglement swapping
Antoni Wojcik, Joanna Modlawska, Andrzej Grudka +1
We consider violation of CHSH inequality for states before and after entanglement swapping. We present a pair of initial states which do not violate CHSH inequality however the fin…
Optimal cloning of qubits given by arbitrary axisymmetric distribution on Bloch sphere
Karol Bartkiewicz, Adam Miranowicz
We find an optimal quantum cloning machine, which clones qubits of arbitrary symmetrical distribution around the Bloch vector with the highest fidelity. The process is referred to…