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Entanglement-based quantum communication over 144km

delete2007-06-03
delete929
PRE
AI
R
Rupert Ursin *
T
Tiefenbacher, F.
S
Schmitt-Manderbach, T.
W
Weier, H.
S
Scheidl, T.
L
Lindenthal, M.
B
Blauensteiner, B.
T
Thomas Jennewein
P
Perdigues, J.
P
Pavel Trojek
O
Oemer, B.
F
Fuerst, M.
M
Meyenburg, M.
J
John Rarity
S
Sodnik, Z.
C
C. Barbieri
H
Harald Weinfurter
A
Anton Zeilinger
DOI：10.1038/nphys629delete
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Abstract

Abstract

En 中文
Quantum entanglement is the main resource to endow the field of quantum information processing with powers that exceed those of classical communication and computation. In view of applications such as quantum cryptography or quantum teleportation, extension of quantum-entanglement-based protocols to global distances is of considerable practical interest. Here we experimentally demonstrate entanglement-based quantum key distribution over 144 km. One photon is measured locally at the Canary Island of La Palma, whereas the other is sent over an optical free-space link to Tenerife, where the Optical Ground Station of the European Space Agency acts as the receiver. This exceeds previous free-space experiments by more than an order of magnitude in distance, and is an essential step towards future satellite-based quantum communication and experimental tests on quantum physics in space.
Keywords:
KEY DISTRIBUTION
BELL THEOREM
TELEPORTATION
CRYPTOGRAPHY
PHOTONS
STATE
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Key information extracted from the uploaded paper, including a brief overview, abstract, background, key highlights, visual analysis, and future outlook.

Journal

Nature Physics cover
Nature Physics
IF:
18.4
Papers:
6.7K
Citations:
5.7W

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