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We have demonstrated transport of 9 Be + ions through a two-dimensional Paul-trap array that incorporates an X junction, while maintaining the ions near the motional ground state of the confining potential well. We expand on the first report of the experiment in Blakestad et al. [Phys. Rev. Lett. 102, 153002 (2009)], including a detailed discussion of how the transport potentials were calculated. Two main mechanisms that caused motional excitation during transport are explained, along with the methods used to mitigate such excitation. We reduced the motional excitation below the results in the above reference by a factor of approximately 50. The effect of a mu-metal shield on qubit coherence is also reported. Finally, we examined a method for exchanging energy between multiple motional modes on the few-quanta level, which could be useful for cooling motional modes without directly accessing the modes with lasers. These results establish how trapped ions can be transported in a large-scale quantum processor with high fidelity.

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“…Absolute pair loss rates were higher than those for single ions, presumably due to multi-ion effects [5,33].…”

Section: Transport Experimentsmentioning

confidence: 85%

“…and stretch modes was measured. Additional heating mechanisms for multiple ions [5,33] may explain the higherenergy gain observed for the pair. For E-C-V-C-E transport, the two-ion crystal must rotate from theẑ axis to thex axis and back.…”

Section: This Workmentioning

confidence: 99%

Near-ground-state transport of trapped-ion qubits through a multidimensional array

et al. 2011

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“…However, the pure Coulomb systems realized so far are not large enough to neglect surface effects and hence do not allow observation of infinite-volume or bulk behavior [11]. For example, the "micromotion" of ions in the rf trap, which generates the trapping potential, can cause heating which limits the smallest dimension of laser-cooled ion collections to a few interparticle spacings [3]. The drawback of the Penning trap (which uses static trapping fields) vis a vis the-r-f trap is that the ions rotate about the trap magnetic fieldthis has hindered imaging of the ion crystals as seen in Paul traps [3,8,10].…”

mentioning

confidence: 99%

“…For example, the "micromotion" of ions in the rf trap, which generates the trapping potential, can cause heating which limits the smallest dimension of laser-cooled ion collections to a few interparticle spacings [3]. The drawback of the Penning trap (which uses static trapping fields) vis a vis the-r-f trap is that the ions rotate about the trap magnetic fieldthis has hindered imaging of the ion crystals as seen in Paul traps [3,8,10]. However, the Penning trap, which has no micromotion heating, can potentially store very large systems of laser-cooled ions and hence was used in the studies here.…”

mentioning

confidence: 99%

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Long-Range Order in Laser-Cooled, Atomic-Ion Wigner Crystals Observed by Bragg Scattering

et al. 1995

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We report the first observation of Bragg scattering from atomic ions confined in an electromagnetic trap. The results reveal long-range order and give evidence for bulk behavior in a strongly coupled collection of laser-cooled Be+ ions in a Penning trap. Long-range order emerges in approximately spherical clouds with as few as 5 X 104 ions (cloud radius ro = 37a where a = -Wigner-Seitz radius). Bulk behavior is evident with 2.7 X 10s trapped ions (ro = 65a), with Bragg scattering patterns characteristic of a body-centered cubic lattice. PACS numbers: 32.80.Pj, 52.25.Wz Systems of crystallized charged particles have gained wide interest, with implications for the pure Coulomb systems of one-component plasmas [1], trapped atomic ions [1 -3], ion storage rings [4], and dense astrophysical matter [5], and for the shielded Coulomb systems of colloidal suspensions [6] and dusty plasmas [7]. For example, Paul rf traps have been used to study crystallization and melting of small "Coulomb clusters" [8]. In both the rf and Penning traps, cold ions form shell structures when the dimensions

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