Hamburg 2009 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 60: Quanteneffekte: Dekohärenz
Q 60.1: Talk
Friday, March 6, 2009, 10:30–10:45, VMP 6 HS-D
Towards homodyne tomography of atomic states — •Jürgen Appel, Anne Louchet, Ulrich Busk Hoff, Daniel Oblak, Patrick Windpassinger, Niels Kjaergaard, and Eugene Polzik — Niels Bohr Institute, Copenhagen, Denmark
The collective enhancement of the coupling between light and atomic ensembles provides a mapping of the quadrature operators of the light field onto quasi-spin variables of atoms. This enables the demonstration of central building blocks of quantum technology such as entanglement, quantum memory, single-photon generation and teleportation. Recently [1] we presented a light shot noise limited method to perform quantum non-demolition measurements of the atomic state, and thus conditionally prepared an entangled and spin squeezed state of 105 atoms. I will report about our recent progress towards using this dispersive probing method for performing full tomography of the atomic quasi-spin state, in analogy to homodyne detection of light. We investigate the effect of our QND probing on the coherence between the atomic states and analyze the effect of phase noise of our microwave oscillator on these measurements.
[1] J. Appel et al. Arxiv 0810.3545 (2008)