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Local and Remote Networks of Trapped Ions
Christopher Monroe, Joint Quantum Institute and University of Maryland
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Laser-cooled and trapped atomic ions are standards for quantum information science, acting as qubits with unsurpassed levels of quantum coherence while also allowing near-perfect measurement. When qubit state-dependent optical forces are applied to a collection of atomic ions, their Coulomb interaction is modulated in a way that allows the entanglement of the qubits through quantum gates that can form the basis of a quantum computer. Similar forces allow the simulation of quantum magnetic interactions, and recent experiments have implemented transverse Ising or XY models with up to 20 trapped ions, and this seminar will cover recent experimental results, from studies of equilibrium ground states [1,2] and dynamics [3,4] to the implementation of certain interacting spin-1 models [5] that may show certain topologically-ordered ground states. Soon these experiments will be extended to >20 spins, where no classical computer can predict its behavior, particularly the many-body dynamics. Scaling to even larger numbers can be accomplished by coupling trapped ion qubits to photons [6,7], where entanglement can be formed over remote distances for applications in quantum communication, quantum teleportation, and modular quantum computation.
[1] R. Islam, et al., Science 340, 583 (2013).
[2] P. Richerme, et al., Phys. Rev. Lett. 111, 100506 (2013).
[3] P. Richerme, et al., Nature 511, 198 (2014).
[4] C. Senko, et al., Science 345, 430 (2014).
[5] C. Senko, et al., arXiv 1410.0937 (2014).
[6] L.-M. Duan and C. Monroe, Rev. Mod. Phys. 82, 1209 (2010).
[7] D. Hucul, et al., Nature Physics doi:10.1038/nphys3150, arXiv 1403.3696 (2014).