Quantum teleportation over 143 kilometres using active feed-forward

By Xiao-song Ma, T. Herbst, Thomas Scheidl, Daqing Wang, Sebastian Kropatschek, W. Naylor, B. Wittmann, A. Mech, Johannes Kofler, E. Anisimova and 4 more. Nature, 2012

649 citations recorded by the source corpus.

The quantum internet is predicted to be the next-generation information processing platform, promising secure communication and an exponential speed-up in distributed computation. The distribution of single qubits over large distances via quantum teleportation is a key ingredient for realizing such a global platform. By using quantum teleportation, unknown quantum states can be transferred over arbitrary distances to a party whose location is unknown. Since the first experimental demonstrations of quantum teleportation of independent external qubits, an internal qubit and squeezed states, researchers have progressively extended the communication distance. Usually this occurs 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. The benchmark for a global quantum internet is quantum teleportation of independent qubits over a free-space link whose attenuation corresponds to the path between a satellite and a ground station. Here we report such an experiment, using active feed-forward in real time. The experiment uses two free-space optical links, quantum and classical, over 143 kilometres between the two Canary Islands of La Palma and Tenerife. To achieve this, we combine advanced techniques involving a frequency-uncorrelated polarization-entangled photon pair source, ultra-low-noise single-photon detectors and entanglement-assisted clock synchronization. The average teleported state fidelity is well beyond the classical limit of two-thirds. Furthermore, we confirm the quality of the quantum teleportation procedure without feed-forward by complete quantum process tomography. Our experiment verifies the maturity and applicability of such technologies in real-world scenarios, in particular for future satellite-based quantum teleportation.

Subfields: Artificial Intelligence, Atomic and Molecular Physics, and Optics

View Paper: https://www.semanticscholar.org/paper/a1b79fc63111db536376595971564039c4b9c9ec

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Citations in the corpus

Optical Communication in Space: Challenges and Mitigation Techniques (2017, methodology): “A feed-forward vibration compensation model is compared with feedback model for the inter-satellite FSO link in [189] and [190].”
High‐Dimensional Quantum Communication: Benefits, Progress, and Future Challenges (2019, background): “Several proof-of-concept studies have already demonstrated the high-fidelity transmission of entangled photons up to 143 km for a ground link [144], 1200 km with a satellite link for quantum communication on a global scale [145], and transmission of attenuate laser up to Global Navigation Satellite ”
Consciousness In The Universe (2011, background): “The parts remain somehow connected, even when spatially separated by very significant distances (the present experimental record being 143 kilometers [106]).”
Quantum teleportation on a photonic chip (2014, neutral): “[7] Ma, X.”
Development of Quantum Interconnects (QuICs) for Next-Generation Information Technologies (2021, neutral): “Nevertheless, many of these challenges have been overcome in a series of free-space quantum communication demonstrations, between mountains [52], [53], over water [54] within cities [55]–[57], from airplanes [58], balloons, and drones [59] and even using satellites in low-earth orbit [6”
A quantum network of clocks (2013, background): “It might also be interesting to explore if high-fidelity entangled EPR pairs can be used to create remote entangled states of spinsqueezed type [3, 31, 32], possibly by following the approach for cat state preparation in remote optical cavities [33], or using local, collective interactions and repet”