Quantum teleportation using active feed-forward between two Canary Islands
Xiao-song Ma, Thomas Herbst, Thomas Scheidl, Daqing Wang, Sebastian, Kropatschek, William Naylor, Alexandra Mech, Bernhard Wittmann, Johannes, Kofler, Elena Anisimova, Vadim Makarov, Thomas Jennewein, Rupert Ursin, Anton, Zeilinger

TL;DR
This paper demonstrates the first long-distance quantum teleportation with active feed-forward over 143 km between Canary Islands, using advanced techniques to achieve high fidelity and confirming the feasibility for satellite-based quantum communication.
Contribution
It presents the first real-time active feed-forward quantum teleportation over a 143 km free-space link, advancing practical quantum communication technology.
Findings
Average teleportation fidelity exceeded classical limit
Successful quantum process tomography confirmed procedure quality
Technologies demonstrated are suitable for satellite-based quantum teleportation
Abstract
Quantum teleportation [1] is a quintessential prerequisite of many quantum information processing protocols [2-4]. By using quantum teleportation, one can circumvent the no-cloning theorem [5] and faithfully transfer unknown quantum states to a party whose location is even unknown over arbitrary distances. Ever since the first experimental demonstrations of quantum teleportation of independent qubits [6] and of squeezed states [7], researchers have progressively extended the communication distance in teleportation, usually without active feed-forward of the classical Bell-state measurement result which is an essential ingredient in future applications such as communication between quantum computers. Here we report the first long-distance quantum teleportation experiment with active feed-forward in real time. The experiment employed two optical links, quantum and classical, over 143 km…
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