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We demonstrate an efficient fiber-coupled source of nondegenerate polarization-entangled photons at 795 and 16090. 3em{0ex}nm using bidirectionally pumped parametric down-conversion in bulk periodically poled lithium niobate. The single-mode source has an inferred bandwidth of 500. 3em{0ex}GHz and a spectral brightness of 3000. 3em{0ex}pairs∕ (s0. 2em{0ex}GHz0. 2em{0ex}mW) of pump power that is suitable for narrowband applications such as entanglement transfer from photonic to atomic qubits.
König et al. (Wed,) studied this question.
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