Julian Hofmann

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Entanglement is the essential feature of quantum mechanics. Notably, observers of two or more entangled particles will find correlations in their measurement results that cannot be explained by classical statistics. To make it a useful resource, particularly for scalable long-distance quantum communication, the heralded generation of entanglement between(More)
Entanglement between distant atomic quantum memories is a key resource for future applications in quantum communication, as it represents an essential step towards the installation of a quantum repeater link. Such scalable entanglement distribution will enable applications like quantum teleportation, quantum cryptography and links between quantum computers(More)
Atoms and photons are well-suited candidates for quantum information processing and quantum communication. While atoms can be used for storage and manipulation, photons are ideal carriers for the transfer of quantum information. Our group pursues the goal of creating a basic node of a quantum communication network by entangling two independently trapped(More)
This paper presents progress towards creating entanglement between two single trapped <sup>87</sup>Rb-atoms over a distance of 400m. The scheme starts by entangling each atom with a photon. In the next step the two photons are projected onto an entangled state via interferometric Bell-state analysis. The detection of the two photons heralds entanglement of(More)
Summary form only given. Quantum teleportation allows to transfer the quantum state of a particle to a remote location without sending the particle itself. This makes it a versatile tool for the distribution of quantum states over long distances or the remote preparation of quantum memories as they are necessary in various scenarios of quantum information(More)
One crucial requirement for quantum computation, communication, and metrology is the highly efficient and fast readout of qubit states. For atomic qubits, the frequently used fluorescence method enables a detection efficiency of almost unity, yet, at the cost of long detection times. To reduce the measurement duration one can either increase the numerical(More)
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