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SESSION 8: IonsChair: (Kenneth Brown (Duke University)) | |
| 1:30pm-2:15pm | Wesley C. Campbell, University of California, Los Angeles Combs and isotopic customization for trapped ion quantum computing | Abstract. Since ions bind their valence electrons tightly, the light needed to work with them is often in the UV part of the spectrum, where laser light is difficult to produce and manage. We have pursued two avenues in an attempt to address this problem. First, we will discuss how optical frequency combs may be employed to ease the creation of short-wavelength light. We find that, when illuminated by a comb, trapped ions can behave as a phonon laser whose gain saturation protects them from being boiled out of the trap by the hundreds of blue-detuned comb teeth present. Second, in collaboration with Eric Hudson's group at UCLA, we describe work with barium ions, the species with the longest-wavelength transitions among the obvious choices. We discuss why creating a particular radioactive isotope endows Ba+ with the atomic structure advantages of more-difficult species and position it as a flexible, easy to use, all purpose qubit. |
| 2:15pm-2:45pm | Eli Megidish, University of California Berkeley Michelson-Morley analogue for electrons using trapped ions to test Lorentz symmetry | Abstract. Probing for local Lorentz violation is important in the search for physics beyond the standard model. Lorentz violations in the electro- magnetic sector can be probed by performing an electron analogue of the Michelson-Morley experiment. We split an electron wave packet inside a Calcium ion into two parts with different orientations and recombine them back to probe for any phase differences. As the earth rotates, the absolute spatial orientation of the two wave packets change, and anisotropies in the electron dispersion will modify the phase of the interference signal. To reduce noise, we prepare a highly entangled state in calcium ions insusceptible to common magnetic field noise. Our experiment demonstrates the potential use of quantum entanglement to enhance the sensitivity of precision measurements. |
| 2:45-3:15pm | Pak Hong Leung, Duke University Optimized two-qubit gates in a long, linear ion crystal using continuous frequency modulation | Abstract. High-fidelity two-qubit gates in a multi-ion crystal has become one of the greatest challenges in ion trap quantum computation. As we scale up the number of ions, it becomes increasingly difficult to disentangle the qubits from multiple motional modes. We propose using a continuous frequency-modulated driving force to achieve such a purpose, and present simulational and experimental results of optimized two-qubit gates with a five-ion chain. To predict the mechanics of even longer ion chains, we perform simulation of motional modes with 20 ions or more as we approach the continuum limit, where we may model the chain as a linear charge density. |
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