Bulletin of the American Physical Society
43rd Annual Meeting of the APS Division of Atomic, Molecular and Optical Physics
Volume 57, Number 5
Monday–Friday, June 4–8, 2012; Orange County, California
Session C7: Invited Session: Quantum Manipulations with Rydberg Atoms |
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Chair: Thad Walker, University of Wisconsin-Madison Room: Terrace |
Tuesday, June 5, 2012 2:00PM - 2:30PM |
C7.00001: Non-linear optics using Rydberg atoms Invited Speaker: Charles Adams We present recent work on cooperative non-linear optics where the non-linearity is mediated not directly by the interaction between light and matter, but indirectly by dipole-dipole interactions between light induced excitations. For the giant dipoles associated with transitions between highly excited Rydberg states, a single excitation induces a cooperative response of up to 1000 neighboring atoms, thereby greatly amplifying the effect of each photon. This amplifying mechanism results in strongly enhanced optical non-linearities, see J. D. Pritchard {\it et al}. Phys. Rev. Lett. {\bf 105}, 193603 (2010), allowing the creation and control of non-classical states of light. [Preview Abstract] |
Tuesday, June 5, 2012 2:30PM - 3:00PM |
C7.00002: Towards Quantum Information Processing Using Rydberg Blockade Invited Speaker: Larry Isenhower Neutral atoms show great promise for use as qubits for quantum information processing. Long coherence times combined with the large interactions available using Rydberg states lead to the possibility of high fidelity quantum operations. In addition the long range of the Rydberg blockade mechanism allows for interactions between many qubits leading to significant speedups in some quantum algorithms. This has been specifically shown for Grover's algorithm where a single iteration can be reduced to 6 pulses [1]. In addition initial studies of error rates for this algorithm show that up to 15 qubits can be used in a single register, and that multiple registers could be combined to increase the effective number of qubits. Recent experimental progress using Rydberg blockade has entangled two qubits [2,3] and detailed analysis shows that current experiments are dominated by technical errors [4]. Progress towards improved quantum gates on a new experimental apparatus that has been designed to reduce these technical errors and have greater scalability will be presented.\\[4pt] [1] Molmer, K., Isenhower, L., Saffman, M., {\it J. Phys. B} {\bf 44}, 184016 (2011).\\[0pt] [2] Wilk, T., et al. {\it Phys. Rev. Lett.} {\bf 104}, 010502 (2010).\\[0pt] [3] Zhang, X. L., et al. {\it Phys. Rev. A} {\bf 82}, 030306(R) (2010).\\[0pt] [4] Zhang, X. L., et al. arXiv:1201.6370 (2012). [Preview Abstract] |
Tuesday, June 5, 2012 3:00PM - 3:30PM |
C7.00003: Trapping Rydberg Atoms in an Optical Lattice Invited Speaker: Sarah E. Anderson Optical lattice traps for Rydberg atoms are of interest in advanced science and in practical applications. After a brief discussion of these areas of interest, I will review some basics of optical Rydberg-atom trapping. The trapping potential experienced by a Rydberg atom in an optical lattice is given by the spatial average of the free-electron ponderomotive energy weighted by the Rydberg electron's probability distribution. I will then present experimental results on the trapping of $^{85}$Rb Rydberg atoms in a one-dimensional ponderomotive optical lattice (wavelength 1064~nm). The principal methods employed to study the lattice performance are microwave spectroscopy, which is used to measure the lattice's trapping efficiency, and photo-ionization, which is used to measure the dwell time of the atoms in the lattice. I have achieved a 90$\%$ trapping efficiency for $^{85}$Rb~$50S$ atoms by inverting the lattice immediately after laser excitation of ground-state atoms into Rydberg states. I have characterized the dwell time of the atoms in the lattice using photo-ionization of $50D_{5/2}$ atoms. In continued work, I have explored the dependence of the Rydberg-atom trapping potential on the angular portion of the atomic wavefunction. Distinct angular states exhibit different trapping behavior in the optical lattice, depending on how their wavefunctions are oriented relative to the lattice planes. Specifically, I have measured the lattice potential depth of sublevels of $^{85}$Rb n$D$ atoms (50$\leq$n$\leq$65) in a one-dimensional optical lattice with a transverse DC electric field. The trapping behavior varies substantially for the various angular sublevels, in agreement with theory. The talk will conclude with an outlook into planned experiments. [Preview Abstract] |
Tuesday, June 5, 2012 3:30PM - 4:00PM |
C7.00004: Rydberg atom mediated polar molecule interactions Invited Speaker: Hossein Sadeghpour Manipulating Rydberg interactions in ultracold ensemble is currently in vogue due to the long-range nature of forces and large dipole moments. Interactions between ultracold Rydberg and ground state atoms lead for formation of exotic classes of Rydberg molecules with peculiar properties. A particular class of such homonuclear molecules was recently observed to exhibit linear Stark shifts, pointing to significant permanent electric dipole moments. The symmetry-breaking in these molecules is explained. Rydberg atom mediated coupling with polar molecules leads to formation of ultralong range polyatomic molecules, which can be employed to dramatically enhance the range of controlled interaction between polar molecules, to coherently control molecular orientation, and to individually address polar molecules in optical lattices. A number of scenarios are described. [Preview Abstract] |
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