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Q: Fachverband Quantenoptik und Photonik

Q 48: Quanteninformation: Quantenkommunikation I

Q 48.6: Talk

Thursday, March 5, 2009, 15:15–15:30, Audi-B

Towards two photon interference using NV color centers in diamond — •Florian Kaiser, Vincent Jacques, Helmut Rathgen, Fedor Jelezko, and Jörg Wrachtrup — 3. Physikalisches Institut in Stuttgart

The NV color center in diamond is of special interest for quantum information science because it exhibits a paramagnetic ground state, that spin can be optically polarized and read out with long coherence times [1,2]. To perform quantum operations by using such solid state spin qubits, multipartite entanglement among single spins is required. One strategy to entangle two distant qubits requires the emission of Fourier-transform limited single photons from each NV center. By performing a two photon interference experiment, it would then be possible to create conditional entanglement between the spin qubits without any direct interactions between them [3]. However counting rates are yet not sufficient to use such a protocol. To increase the photon collection efficiency, different Solid Immersion Lens techniques are investigated. We demonstrate a five times enhancement of the setup collection efficiency, which might be sufficient to perform two photon interference between two independent NV centers.

[1] F. Jelezko et al., Phys. Rev. Lett. 92, 076401 (2004).

[2] T. Gaebel et al., Nat. Phys. 2, 408 (2006).

[3] D. L. Moehring et al., Nature 449, 68 (2007).