Quantum gate in the decoherence-free subspace of trapped ion qubits

Details Quantum gate in the decoherence-free subspace of trapped ion qubits Quantum gate in the decoherence-free subspace of trapped ion qubits

2009-09-29

arxiv.org/abs/0909.5397v2

Europhys. Lett. 92, 30006 (2010)

Physics

Quantum Physics

6 pages, 6 figures

Scientific paper

We propose a geometric phase gate in a decoherence-free subspace with trapped ions. The quantum information is encoded in the Zeeman sublevels of the ground-state and two physical qubits to make up one logical qubit with ultra long coherence time. Single- and two-qubit operations together with the transport and splitting of linear ion crystals allow for a robust and decoherence-free scalable quantum processor. For the ease of the phase gate realization we employ one Raman laser field on four ions simultaneously, i.e. no tight focus for addressing. The decoherence-free subspace is left neither during gate operations nor during the transport of quantum information.

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