143 km free-space quantum teleportation

Autor(en)

Thomas Herbst, Xiao-Song Ma, Thomas Scheidl, Bernhard Wittmann, Rupert Ursin, Anton Zeilinger

Abstrakt

In the field of quantum communication the teleportation(1) of single quanta plays a fundamental role in numerous quantum information-processing protocols. Quantum teleportation allows to faithfully transfer unknown quantum states over arbitrary distances and constitutes a method to circumvent the no-cloning theorem(2). Even formally completely independent particles can become entangled via the process of entanglement swapping(3). In a future quantum communication network(4) this will be of utmost importance, enabling quantum computers to become globally interconnected. In order to prove the feasibility of quantum teleportation under optical link attenuations that will arise in a future space-application scenario, we extended the communication distance to 143 km, employing an optical free-space link between the two Canary Islands of La Palma and Tenerife. This work proofs the feasibility of ground-based free-space quantum teleportation. With our setup we were able to achieve coincidence production rates and fidelities to cope with the optical link attenuation, resulting from various experimental and technical challenges, which will arise in a quantum transmission between a ground-based transmitter and a low-earth-orbiting satellite receiver(5). In our experiment we gained an average state fidelity for the teleported quantum states of more than 6 standard deviations beyond the classical limit of 2/3 and a process fidelity of 0.710(42). We expect that many of the features implemented in this experiment will be key blocks for future investigations.

Organisation(en)

Quantenoptik, Quantennanophysik und Quanteninformation

Externe Organisation(en)

Yale University

Anzahl der Seiten

7

DOI

https://doi.org/10.1117/12.2061981

Publikationsdatum

10-2014

Peer-reviewed

Ja

ÖFOS 2012

103026 Quantenoptik

Schlagwörter

ASJC Scopus Sachgebiete

Electronic, Optical and Magnetic Materials, Condensed Matter Physics, Applied Mathematics, Electrical and Electronic Engineering, Computer Science Applications

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/d18e7204-200d-410d-a6ca-3c65fa70e1e9