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Updated: Jan 20, 2026

Standardized Method for Measuring Collection Efficiency from Wipe-sampling of Trace Explosives
Published on: April 10, 2017
Simultaneous Readout of Noncommuting Collective Spin Observables beyond the Standard Quantum Limit
Philipp Kunkel1, Maximilian Prüfer1, Stefan Lannig1
1Kirchhoff-Institut für Physik, Universität Heidelberg, Im Neuenheimer Feld 227, 69120 Heidelberg, Germany.
Abstract:
We augment the information extractable from a single absorption image of a spinor Bose-Einstein condensate by coupling to initially empty auxiliary hyperfine states. Performing unitary transformations in both the original and auxiliary hyperfine manifold enables the simultaneous measurement of multiple spin-1 observables. We apply this scheme to an elongated atomic cloud of ^{87}Rb to simultaneously read out three orthogonal spin directions and with that directly access the spatial spin structure. The readout even allows the extraction of quantum correlations which we demonstrate by detecting spin-nematic squeezing without state tomography.
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