Composite anyon coding and the initialization of a topological quantum computer

Details Composite anyon coding and the initialization of a topological quantum computer Composite anyon coding and the initialization of a topological quantum computer

2009-10-13

arxiv.org/abs/0910.2427v2

Phys. Rev. A 81, 052309 (2010)

Physics

Quantum Physics

7 pages, 3 figures, v2: updated to match published version

Scientific paper

10.1103/PhysRevA.81.052309

Schemes for topological quantum computation are usually based on the assumption that the system is initially prepared in a specific state. In practice, this state preparation is expected to be challenging as it involves non-topological operations which heavily depend on the experimental realization and are not naturally robust against noise. Here we show that this assumption can be relaxed by using composite anyons: starting from an unknown state with reasonable physical properties, it is possible to efficiently distill suitable initial states for computation purely by braiding. This is achieved by encoding logical information in a subsystem code with gauge system corresponding to the internal degrees of freedom of composite objects.

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