If a photon interacts with a member of an entangled photon pair via aso-called Bell-state measurement (BSM), its state is teleported overprincipally arbitrary distances onto the second member of the pair. Starting in1997, this puzzling prediction of quantum mechanics has been demonstrated manytimes; however, with one very recent exception, only the photon that receivedthe teleported state, if any, travelled far while the photons partaking in theBSM were always measured closely to where they were created. Here, using theCalgary fibre network, we report quantum teleportation from atelecommunication-wavelength photon, interacting with another telecommunicationphoton after both have travelled over several kilometres in bee-line, onto aphoton at 795~nm wavelength. This improves the distance over whichteleportation takes place from 818~m to 6.2~km. Our demonstration establishesan important requirement for quantum repeater-based communications andconstitutes a milestone on the path to a global quantum Internet.
展开▼
