1. Tomography of a number-resolving detector by reconstruction of an atomic many-body quantum state
- Author
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Hetzel, Mareike, Pezzè, Luca, Pür, Cebrail, Quensen, Martin, Hüper, Andreas, Geng, Jiao, Kruse, Jens, Santos, Luis, Ertmer, Wolfgang, Smerzi, Augusto, and Klempt, Carsten
- Subjects
Condensed Matter::Quantum Gases ,Quantum Physics ,Quantum Gases (cond-mat.quant-gas) ,Atomic Physics (physics.atom-ph) ,FOS: Physical sciences ,Physics::Atomic Physics ,Condensed Matter - Quantum Gases ,Quantum Physics (quant-ph) ,Physics - Atomic Physics - Abstract
The high-fidelity analysis of many-body quantum states of indistinguishable atoms requires the accurate counting of atoms. Here we report the tomographic reconstruction of an atom-number-resolving detector. The tomography is performed with an ultracold rubidium ensemble that is prepared in a coherent spin state by driving a Rabi coupling between the two hyperfine clock levels. The coupling is followed by counting the occupation number in one level. We characterize the fidelity of our detector and show that a negative-valued Wigner function is associated with it. Our results offer an exciting perspective for the high-fidelity reconstruction of entangled states and can be applied for a future demonstration of Heisenberg-limited atom interferometry.
- Published
- 2022
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