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4 papers · 2 filters
Bitwise Quantum Min-Entropy Sampling and New Lower Bounds for Random Access Codes
Jürg Wullschleger
Min-entropy sampling gives a bound on the min-entropy of a randomly chosen subset of a string, given a bound on the min-entropy of the whole string. König and Renner showed a min-e…
14-qubit entanglement: creation and coherence
Thomas Monz, Philipp Schindler, Julio T. Barreiro +7
We report the creation of Greenberger-Horne-Zeilinger states with up to 14 qubits. By investigating the coherence of up to 8 ions over time, we observe a decay proportional to the…
Tight bounds for classical and quantum coin flipping
Esther Hänggi, Jürg Wullschleger
Coin flipping is a cryptographic primitive for which strictly better protocols exist if the players are not only allowed to exchange classical, but also quantum messages. During th…
Leggett-Garg inequalities and the geometry of the cut polytope
David Avis, Patrick Hayden, Mark M. Wilde
The Bell and Leggett-Garg tests offer operational ways to demonstrate that non-classical behavior manifests itself in quantum systems, and experimentalists have implemented these p…