Experiment demonstrates atom-atom entanglement via Bell state measurement in 40Ca+ ions, highlighting its potential for quantum repeaters.
We demonstrate Hong-Ou-Mandel interference of 854-nm photons emitted by and entangled with two co-trapped 40 Ca + ions, excited by nanosecond 393-nm laser pulses. We present evidence for atom-atom entanglement following a photonic Bell state measurement.
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Baumgart et al. (2025) studied this question.
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