Berlin 2001 – scientific programme

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Q: Quantenoptik

Q 9: Poster: Quantum Information

Q 9.7: Poster

Tuesday, April 3, 2001, 12:30–15:00, AT2

Conditional teleportation with entangled single-photon states — •Jens Clausen, Ludwig Knöll, and Dirk-Gunnar Welsch — Friedrich-Schiller-Universität Jena, Theoretisch-Physikalisches Institut, Max-Wien-Platz 1, D-07743 Jena, Germany

We study the conditional teleportation of single-mode quantum states whose Fock-expansion breaks off at a given number N. Instead of a two-mode squeezed vacuum state the two parties share a sequence of N pulses each containing a single photon which has been spatially split using a beam splitter. Alice and Bob perform zero and single photon number measurements. If the appropriate measurement outcome is yielded, the teleportation is completed without need to further manipulate the quantum state obtained at Bob’s receiving station. The information transmitted via the classical channel is therefore reduced to Alice’s confirmation that the correct measurement result has been obtained. Since the success probability decreases exponentially with increasing N, attention is limited to states containing only few photons.