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18 papers · 2 filters
Hidden variable problem for a family of continuously many spin 1 measurements
Pawel Kurzynski, Akihito Soeda, Bartlomiej Bzdega +1
We study a continuous set of spin 1 measurements and show that for a special family of measurements parametrized by a single variable the possibility of hidden-variable descrip…
Two-photon and three-photon blockades in driven nonlinear systems
Adam Miranowicz, Malgorzata Paprzycka, Yu-xi Liu +2
Photon blockade, in analogy to Coulomb's or phonon blockades, is a phenomenon when a single photon in a nonlinear cavity blocks the transmission of a second photon. This effect can…
Evolution of quantum correlations in a two-atom system
Ryszard Tanaś
We discuss the evolution of quantum correlations for a system of two two-level atoms interacting with a common reservoir. The Markovian master equation is used to describe the evol…
Conjectured strong complementary-correlations tradeoff
Andrzej Grudka, Michał Horodecki, Paweł Horodecki +3
We conjecture new uncertainty relations which restrict correlations between results of measurements performed by two separated parties on a shared quantum state. The first uncertai…
Quantum circuits for amplification of Kerr nonlinearity via quadrature squeezing
Monika Bartkowiak, Lian-Ao Wu, Adam Miranowicz
Phase shifts induced by the Kerr effect are usually very small at the single-photon level. We propose two circuits for enhancing the cross-Kerr phase shift by applying one- and two…
Analytical progress on symmetric geometric discord: Measurement-based upper bounds
Adam Miranowicz, Pawel Horodecki, Ravindra W. Chhajlany +2
Quantum correlations may be measured by means of the distance of the state to the subclass of states having well defined classical properties. In particular, a geometric measur…