QUROPE Quantum Information Processing and Communication in Europe

Le Nouvel Observateur writes about cold atoms (in French).

The Austrian newspaper Der Standard brings a story about the "quantum piano".

Ecco l' orologio quantico Batte in precisione anche quello atomico

The Sueddeutsche Zeitung writes about Max Planck (in German).

The Wiener Zeitung writes about Anton Zeilinger for his 65th birthday (in German).

We consider quantum computations comprising only commuting gates, known as IQP computations, and provide compelling evidence that the task of sampling their output probability distributions is unlikely to be achievable by any efficient classical means. More specifically we introduce the class post-IQP of languages decided with bounded error by uniform families of IQP circuits with post-selection, and prove first that post-IQP equals the classical class PP.

Traditionally, quantum entanglement has played a central role in foundational discussions of quantum mechanics. The measurement of correlations between entangled particles can exhibit results at odds with classical behavior. These discrepancies increase exponentially with the number of entangled particles. When entanglement is extended from just two quantum bits (qubits) to three, the incompatibilities between classical and quantum correlation properties can change from a violation of inequalities involving statistical averages to sign differences in deterministic observations.

Entanglement is one of the key resources required for quantum computation, so experimentally creating and measuring entangled states is of crucial importance in the various physical implementations of a quantum computer. In superconducting qubits, two-qubit entangled states have been demonstrated and used to show violations of Bell's Inequality and to implement simple quantum algorithms.

The Wiener Zeitung writes about the quantum world (in German).

Ein chinesisch-deutsch-österreichisches Physikerteam hat in einem Experiment erstmals zehn Qubits ("Quantenbits") auf fünf verschränkten Photonen erzeugt.