Generation of a decoherence-free entangled state using a radio frequency dressed state

Details Generation of a decoherence-free entangled state using a radio frequency dressed state Generation of a decoherence-free entangled state using a radio frequency dressed state

2011-10-18

arxiv.org/abs/1110.3911v2

Physics

Quantum Physics

4 figures

Scientific paper

We propose the generation of entangled states with trapped calcium ions using a combination of an rf dressed state and a spin dependent force. Using this method, a decoherence-free entangled state of rf qubits can be directly generated and ideally its fidelity is close to unity. We demonstrate an rf entangled state with a fidelity of 0.68, which has a coherence time of more than 200 ms by virtue of the fact that it is an eigenstate with energy gaps between adjacent levels.Using the same technique, we also produce a qutrit-qutrit entangled state with a fidelity of 0.77, which exceeds the threshold value for separability of 2/3.

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