Indistinguishability of single Raman photons from single atoms
Pascal Baumgart, Max Bergerhoff, Jürgen Eschner
Abstract
We theoretically investigate the indistinguishability of single photons generated from single trapped 40Ca+ ions in a Raman scattering process driven by few-nanosecond excitation pulses. Of particular interest is how spontaneous decay back to the initial state affects Hong-Ou-Mandel (HOM) photon interference. Numerical simulations identify the mean number of back-decays as a measurable quantity that correlates with achievable HOM visibility. Optimization of the excitation pulse with respect to a trade-off between photon yield and indistinguishability is analyzed. Finally, we compare the performance of different trapped-ion species for long-range dual-rail entanglement swapping via HOM photon interference.
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