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Springer series on atomic, optical, and plasma physics

Quantum Computing with Trapped Charged Particles

Günther Werth, VIORICA N. GHEORGHE, Fouad G. Major

Published Jan 1, 2009• 0 citations
Publisher
DOI
10.1007/978-3-540-92261-2_8

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Trapped charged particles are among the leading qubit candidates for quantum computing technologies. However, our ability to interconnect arrays of particles in different traps is a significant hurdle in scaling trapped charged particle quantum computing. One approach explored to overcome this problem is to use a solid state conducting wire to mediate the Coulomb interaction between particles in different traps. Additionally, there is strong interest in interfacing trapped charged particle qubits with solid state superconducting qubits to develop hybrid systems which benefit from the complementary strengths of the two technologies. For studies related to these fields, a trapped charged particle inducing charge on a conductor has long been modeled using equivalent circuit elements. The equivalent circuit element approach is popular partly due to the appeal of a model for analyzing systems using simple electronic components. As a result, a body of theoretical work is founded on this approach. However, careful consideration of the model leads to inconsistencies. We show that this suggests many studies based on the model should be reviewed. Our result removes a potential road-block for future studies aiming to use conductors to connect independent arrays of charged particles, or to interface charged particles with solid-state qubit technologies. In addition, for the specific case of two trapped charges interacting via a conducting coupling system, we introduce an alternative way to use linear relationships, which reproduces results from other works that are not based on the circuit-element model. This method may be useful in trouble-shooting real experimental designs and assessing the accuracy of different theoretical models.
We describe and use a macroscopic linear quadrupolar trap to explore the trapping and equilibrium properties of charged particles. These devices, when operated to trap atomic ions, are at the core of ion based quantum computer and optical atomic clock. To illustrate the characteristics of few particle trapping, and observe different force balance on a charged particle, a macroscopic linear trap, operating at room condition, is trapping micrometer-sized particles. Compared to atomic or molecular ions, their mass can not be neglected and requires an extra voltage for gravity force compensation. We show how this compensation can be demonstrated experimentally and that the choice of hollow-core glass spheres has the advantage of a good reproducibility of the experiments, that allows one to deduce with good precision the charge-to-mass ratio of the trapped particle.
We describe and use a macroscopic linear quadrupolar trap to explore the trapping and equilibrium properties of charged particles. These devices, when operated to trap atomic ions, are at the core of ion based quantum computer and optical atomic clock. To illustrate the characteristics of few particle trapping, and observe different force balance on a charged particle, a macroscopic linear trap, operating at room condition, is trapping micrometer-sized particles. Compared to atomic or molecular ions, their mass can not be neglected and requires an extra voltage for gravity force compensation. We show how this compensation can be demonstrated experimentally and that the choice of hollow-core glass spheres has the advantage of a good reproducibility of the experiments, that allows one to deduce with good precision the charge-to-mass ratio of the trapped particle.