Download Cooperative Optical Non-Linearity in a Blockaded Rydberg by Jonathan D. Pritchard PDF

By Jonathan D. Pritchard

This thesis describes the 1st demonstration of a cooperative optical non-linearity in line with Rydberg excitation. while in traditional non-linear optics the non-linearity arises at once from the interplay among mild and topic, in a cooperative method it's mediated through dipole-dipole interactions among light-induced excitations. For excitation to excessive Rydberg states the place the electron is just weakly certain, the dipole-dipole interactions are tremendous huge and lengthy variety, allowing an immense enhancement of the non-linear influence. hence, cooperative non-linear optics utilizing Rydberg excitations opens a brand new period for quantum optics allowing huge unmarried photon non-linearity to be available in unfastened area for the 1st time. The thesis describes the theoretical underpinnings of the non- linear impression, the pioneering experimental effects and implications for experiments within the unmarried photon regime.

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Amthor, M. Reetz-Lamour, S. Westermann, J. Denskat, M. Weidemüller, Mechanical effect of van der Waals interactions observed in real time in an ultracold Rydberg gas. Phys. Rev. Lett. 98(2), 023004 (2007) 18. P. Robinson, B. Tolra, B. W. F. Gallagher, P. Pillet, Spontaneous evolution of Rydberg atoms into an ultracold plasma. Phys. Rev. Lett. 85(21), 4466 (2000) 19. W. J. Tanner, Y. F. Gallagher, Ionization and plasma formation in high n cold Rydberg samples. Eur. Phys. J. D. 40(1), 27 (2006) 20.

Gallagher, Ionization and plasma formation in high n cold Rydberg samples. Eur. Phys. J. D. 40(1), 27 (2006) 20. T. Amthor, M. Reetz-Lamour, C. Giese, M. Weidemüller, Modeling many-particle mechanical effects of an interacting Rydberg gas. Phys. Rev. A 76(5), 054702 (2007) 21. T. Amthor, C. S. Hofmann, M. Weidemüller, Evidence of antiblockade in an ultracold Rydberg gas. Phys. Rev. Lett. 104, 013001 (2010) Chapter 4 Atom-Light Interactions The simplest case in which to consider the interaction between atoms and light is that of a two-level atom driven by a coherent optical field.

This effect has been used to map out the nearest-neighbour distribution for a cold atom cloud [21]. 6 Summary The large matrix elements of the Rydberg states leads to strong dipole–dipole interactions between atoms. The interactions can be expressed in two regimes; at long range (V (R) ) this is the van der Waals regime with W = −C6 /R 6 , whilst at short range (V (R) ) the atoms experience resonant dipole–dipole interactions W = C3 /R 3 . For a typical experiment density, the average atomic separation Ravg > RvdW , corresponding to van der Waals interactions for n 60.

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