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By Andreas Reiserer

This thesis studies on significant steps in the direction of the belief of scalable quantum networks. It addresses the experimental implementation of a deterministic interplay mechanism among flying optical photons and a unmarried trapped atom. particularly, it demonstrates the nondestructive detection of an optical photon. To this finish, unmarried rubidium atoms are trapped in a three-d optical lattice on the heart of an optical hollow space within the powerful coupling regime. complete keep an eye on over the atomic kingdom — its place, its movement, and its digital country — is completed with laser beams utilized alongside the resonator and from the part. whilst faint laser pulses are mirrored from the resonator, the mixed atom-photon kingdom acquires a state-dependent part shift. In a primary sequence of experiments, this is often hired to nondestructively discover optical photons via measuring the atomic country after the mirrored image procedure. Then, quantum bits are encoded within the polarization of the laser pulse and within the Zeeman kingdom of the atom. The state-dependent section shift mediates a deterministic common quantum gate among the atom and one or successively mirrored photons, that is used to generate entangled atom-photon, atom-photon-photon, and photon-photon states out of separable enter states.

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67(13), 1727–1730 (1991). 1727. aps. 1727 2. J. Thompson, G. J. Kimble, Observation of normal-mode splitting for an atom in an optical cavity. Phys. Rev. Lett. 68(8), 1132–1135 (1992). 1103/PhysRevLett. 1132. 1132 3. A. , Measurement of conditional phase shifts for quantum logic. Phys. Rev. Lett. 75(25), 4710–4713 (1995). 4710. org/doi/10. 4710 4. J. Harold, in Metcalf and Peter Van der Straten. Laser Cooling And Trapping, (Springer, 1999). ISBN: 978-0-387-98728-6 5. J. , Real-time cavity QED with single atoms.

To analyze and control the atomic motion, we first used a geometry where one of the beams was applied along the cavity, while the other beam was applied from the side, forming an angle of 45° with respect to the other axes of the optical lattice, compare Fig. 2b. The beams were orthogonally polarized, thus driving transitions for any of the atomic Zeeman states. However, it turned out that in this configuration, the coupling strength of the individual sidebands strongly depends on the atomic position within the standing-wave Raman beam, similar to what has been observed in [47].

00010, ISSN: 0028-0836. 1038/nature13177. 1 State Initialization and State Detection The controlled phase gate mechanism that is implemented in this thesis is based on an atomic three-level system, where two of the levels are strongly coupled via the cavity, while the other level is far detuned. This model system is of course only an approximation to the real experimental situation, as the used 87 Rb atoms exhibit a richer level structure, see Fig. 1. For the atom-photon interaction mechanism, only a small fraction of the atomic levels are used, namely the states marked in black: |1, 1 , |2, 2 and 3 , 3 .

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