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Optica Publishing Group
  • Optical Fiber Communication Conference and International Conference on Quantum Information
  • 2001 OSA Technical Digest Series (Optica Publishing Group, 2001),
  • paper PA35
  • https://doi.org/10.1364/ICQI.2001.PA35

Trapped-Ion Entanglement for Precision Measurements and Decoherence Suppression

Open Access Open Access


Experiments with two entangled trapped 9Be+ ions are discussed. In one type of experiments we used entanglement to increase the precision of rotation angle measurements. For “spin-squeezed" and maximally entangled states we observed a reduction in uncertainty of rotation angle below the standard quantum limit. In a second experiment we demonstrate a decoherence-free quantum memory of one qubit. By encoding the qubit into the decoherence-free subspace of two ions, we protect it from environment-induced dephasing. We increased the storage time by up to an order of magnitude compared to an unprotected qubit.

© 2001 Optical Society of America

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