Measurement-based entanglement of noninteracting bosonic atoms

Abstract

We demonstrate the ability to extract a spin-entangled state of two neutral atoms via postselection based on a measurement of their spatial configuration. Typically, entangled states of neutral atoms are engineered via atom-atom interactions. In contrast, in our work we use Hong-Ou-Mandel interference to postselect a spin-singlet state after overlapping two atoms in distinct spin states on an effective beam splitter. We verify the presence of entanglement and determine a bound on the postselected fidelity of a spin-singlet state of $\left(0.62\pm 0.03\right)$. The experiment has direct analogy to creating polarization entanglement with single photons and hence demonstrates the potential to use protocols developed for photons to create complex quantum states with noninteracting atoms.

11 pages, 4 figures

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• Direct Measurements of Collisional Dynamics in Cold Atom Triads
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• The Hong-Ou-Mandel effect with atoms
• Quantum computational supremacy in the sampling of bosonic random walkers on a one-dimensional lattice
• Characterizing twin-particle entanglement in double-well potentials
• Imaginary time evolution with quantum nondemolition measurements: multi-qubit interactions via measurement nonlinearities
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• Fermionic vs. bosonic two-site Hubbard models with a pair of interacting cold atoms
• Tunnel-coupled optical microtraps for ultracold atoms
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• Lellouch-Lüscher relation for ultracold few-atom systems under confinement