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Abstract: We discuss a quantum-metrology protocol designed to estimate a physicalparameter in a Bose-Einstein condensate of N atoms, and we show that themeasurement uncertainty can decrease faster than 1-N. The 1-N scaling isusually thought to be the best possible in any measurement scheme. From theperspective of quantum information theory, we outline the main idea that leadsto a measurement uncertainty that scales better than 1-N. We examine in detailsome potential problems and challenges that arise in implementing such ameasurement protocol using a Bose-Einstein condensate. We discuss how some ofthese issues can be dealt with by using lower-dimensional condensates trappedin nonharmonic potentials.

Autor: Sergio Boixo, Animesh Datta, Matthew J. Davis, Anil Shaji, Alexandre B. Tacla, Carlton M. Caves

Fuente: https://arxiv.org/

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