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Q: Quantenoptik und Photonik
Q 58: Quantenkommunikation
Q 58.6: Vortrag
Donnerstag, 16. März 2006, 12:25–12:40, HVI
Remote State Preparation of a Single Atom — •Wenjamin Rosenfeld1, Stefan Berner1, Markus Weber1, Jürgen Volz1, and Harald Weinfurter1,2 — 1Department for Physics of LMU, 80799 München — 2Max-Planck-Institute of Quantum Optics, 85748 Garching
Entanglement is a key element of quantum information and communication applications. Of special interest is entanglement between different quantum objects like photons and atoms because it enables one to transfer an arbitrary quantum state from one atom to another at a remote location. This forms the basic ingredient for quantum repeater and quantum networks.
Here we demonstrate the remote state preparation of a single optically trapped Rb atom. In the first step the spin state of the atom is entangled with the polarization of a spontaneously emitted photon. Then an additional degree of freedom (spatial mode in an interferometer) is imprinted onto the photon. Performing a projective Bell state measurement on the resulting two-qubit photonic state, together with four local unitary transformations, finally allows to transfer any desired quantum state to the remote atom.