Flying Spin Qubits

Details Flying Spin Qubits Flying Spin Qubits

2006-06-09

arxiv.org/abs/quant-ph/0606089v2

Physics

Quantum Physics

13 pages, 4 figures. Revised manuscript in response to reviewer comments

Scientific paper

We present a method for encoding and transporting qubits within a dimerized Heisenberg spin-1/2 chain. Logical qubits are localized at the domain walls that separate the two possible dimerized states. The domain walls can be moved to produce "flying spin qubits". The topological nature of these states makes them stable against a wide class of perturbations. Pairs of domain walls can be used to generate Einstein-Podolsky-Rosen pairs of entangled qubits. We discuss speed limitations within an exactly solvable three-spin model and describe a possible physical realization using quantum dot arrays.

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