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Bulletin of the American Physical Society

Practical quantum metrology with Bose-Einstein condensates

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

Published May 21, 2009• 0 citations
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We discuss a quantum-metrology protocol designed to estimate a physical parameter in a Bose-Einstein condensate of NNN atoms, and we show that the measurement uncertainty can decrease faster than 1/N1/N1/N. The 1/N1/N1/N scaling is usually thought to be the best possible in any measurement scheme. From the perspective of quantum information theory, we outline the main idea that leads to a measurement uncertainty that scales better than 1/N1/N1/N. We examine in detail some potential problems and challenges that arise in implementing such a measurement protocol using a Bose-Einstein condensate. We discuss how some of these issues can be dealt with by using lower-dimensional condensates trapped in nonharmonic potentials.