Toward Spin Squeezing with Trapped Ions

Details Toward Spin Squeezing with Trapped Ions Toward Spin Squeezing with Trapped Ions

2011-11-21

arxiv.org/abs/1111.4792v1

Physics

Quantum Physics

18 pages, 9 figures, Contribution to Quantum Africa 2010 conference proceedings

Scientific paper

Building robust instruments capable of making interferometric measurements with precision beyond the standard quantum limit remains an important goal in many metrology laboratories. We describe here the basic concepts underlying spin squeezing experiments that allow one to surpass this limit. In priniciple it is possible to reach the so-called Heisenberg limit, which constitutes an improvement in precision by a factor $\sqrt{N}$, where $N$ is the number of particles on which the measurement is carried out. In particular, we focus on recent progress toward implementing spin squeezing with a cloud of beryllium ions in a Penning ion trap, via the geometric phase gate used more commonly for performing two-qubit entangling operations in quantum computing experiments.

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