Michelson-Morley test for electrons using a trapped ion decoherence-free subspace

Thaned Pruttivarasin, Michael T. Ramm, S. G. Porsev +4 more

Li-Xiang Cen, Z. D. Wang, Shun-Jin Wang

We propose a decoherence-free subspace (DFS) scheme to realize scalable quantum computation with trapped ions. The spin-dependent laser-ion coupling is exploited in the presence of Coulomb interactions. A universal set of unconventional geometric quantum gates is achieved in encoded subspaces that are immune from decoherence by collective dephasing. The scalability of the scheme for an ion-array system is demonstrated, either by adiabatically switching on and off the interactions, or by a fast gate scheme with DFS encoding and noise-decoupling techniques.

Wayne M. Itano, James C Bergquist, J. J. Bollinger +5 more

Xin Ding Zhang, Qinghua Zhang, Z. D. Wang

We propose a feasible scheme to achieve holonomic quantum computation in a decoherence-free subspace (DFS) with trapped ions. By the application of appropriate bichromatic laser fields on the designated ions, we are able to construct two noncommutable single-qubit gates and one controlled-phase gate using the holonomic scenario in the encoded DFS.

Cruz I. Velasco, Valerio Di Giulio, F. Javier Garcı́a de Abajo

Frederick Reines, Henry W. Sobel