= Bouwmeester quantum teleportation experiment
{c}
{title2=1997}
<Dik Bouwmeester> and colleagues demonstrated selected-outcome photon-polarization <quantum teleportation>. An ultraviolet pump traversed a nonlinear crystal twice: one passage supplied an entangled pair, the other the input <photon> and its trigger partner. The input and one resource <photon> interfered at a beam splitter; output-detector coincidences selected their antisymmetric <Bell state>. Narrow filters made their coherence time exceed the pump duration, preserving temporal indistinguishability.
The reported pump pulses were $200\,\mathrm{fs}$ long at $76\,\mathrm{MHz}$; $788\,\mathrm{nm}$ <photons> filtered to $4\,\mathrm{nm}$ bandwidth had a quoted $520\,\mathrm{fs}$ coherence time. A <polarization> analyzer measured the remote output. Trigger-conditioned fourfold coincidences excluded a double-pair background without subtraction. The selected Bell result had ideal <probability> $1/4$; this demonstration did not distinguish and actively correct all four outcomes.<Experimental quantum teleportation by Dik Bouwmeester and others>[pp. 576–578, Figures 1, 4 and 5: source, filters, Bell analyzer and background control]{ref}
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