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26 April 2024 |
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Teleporting independent qubits through a 97 km free-space channel | | Juan Yin
; He Lu
; Ji-Gang Ren
; Yuan Cao
; Hai-Lin Yong
; Yu-Ping Wu
; Chang Liu
; Sheng-Kai Liao
; Yan Jiang
; Xin-Dong Cai
; Ping Xu
; Ge-Sheng Pan
; Jian-Yu Wang
; Yu-Ao Chen
; Cheng-Zhi Peng
; Jian-Wei Pan
; | | Date: |
9 May 2012 | | Abstract: | With the help of quantum entanglement, quantum communication can be achieved
between arbitrarily distant places without passing through intermediate
locations by quantum teleportation. In the laboratory, quantum teleportation
has been demonstrated over short distance by photonic and atomic qubits. Using
fiber links, quantum teleportation has been achieved over kilometer distances.
Long distance quantum teleportation is of particular interest and has been one
of the holy grails of practical quantum communication. Most recently, quantum
teleportation over 16 km free-space link was demonstrated. However, a major
restriction in this experiment is that the unknown quantum state cannot
directly come from outside. Here, based on an ultra-bright multi-photon
entanglement source, we demonstrate quantum teleportation, closely following
the original scheme, for any unknown state created outside, between two optical
free-space links separated by 97 km. Over a 35-53 dB high-loss quantum channel,
an average fidelity of 80.4(9) % is achieved for six distinct initial states.
Besides being of fundamental interest, our result represents an important step
towards a global quantum network. Moreover, the high-frequency and
high-accuracy acquiring, pointing and tracking (APT) technique developed in our
experiment can be directly utilized for future satellite-based quantum
communication. | | Source: | arXiv, 1205.2024 | | Services: | Forum | Review | PDF | Favorites | |
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