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Tight multipartite Bell's inequalities involving many measurement settings
Wieslaw Laskowski, Tomasz Paterek, Marek Zukowski +1
We derive tight Bell's inequalities for N>2 observers involving more than two alternative measurement settings. We give a necessary and sufficient condition for a general quantum s…
Crucial Role of Quantum Entanglement in Bulk Properties of Solids
Caslav Brukner, Vlatko Vedral, Anton Zeilinger
We demonstrate that the magnetic susceptibility of strongly alternating antiferromagnetic spin-1/2 chains is an entanglement witness. Specifically, magnetic susceptibility of coppe…
Equation of state for Entanglement in a Fermi gas
Christian Lunkes, Caslav Brukner, Vlatko Vedral
Entanglement distance is the maximal separation between two entangled electrons in a degenerate electron gas. Beyond that distance, all entanglement disappears. We relate entanglem…
Exploiting the randomness of the measurement basis in quantum cryptography: Secure Quantum Key Growing without Privacy Amplification
Hannes R. Böhm, Paul S. Böhm, Markus Aspelmeyer +2
We suggest that the randomness of the choices of measurement basis by Alice and Bob provides an additional important resource for quantum cryptography. As a specific application, w…
Macroscopic Thermodynamical Witnesses of Quantum Entanglement
Caslav Brukner, Vlatko Vedral
We show that macroscopic thermodynamical properties - such as functions of internal energy and magnetization - can detect quantum entanglement in solids at nonzero temperatures in…
Complementarity and Information in "Delayed-choice for entanglement swapping"
Caslav Brukner, Markus Aspelmeyer, Anton Zeilinger
Building on Peres's idea of "Delayed-choice for extanglement swapping" we show that even the degree to which quantum systems were entangled can be defined after they have been regi…