TY - JOUR
T1 - Quantum receiver beyond the standard quantum limit of coherent optical communication
AU - Tsujino, Kenji
AU - Fukuda, Daiji
AU - Fujii, Go
AU - Inoue, Shuichiro
AU - Fujiwara, Mikio
AU - Takeoka, Masahiro
AU - Sasaki, Masahide
PY - 2011/6/24
Y1 - 2011/6/24
N2 - The most efficient modern optical communication is known as coherent communication, and its standard quantum limit is almost reachable with current technology. Though it has been predicted for a long time that this standard quantum limit could be overcome via quantum mechanically optimized receivers, such a performance has not been experimentally realized so far. Here we demonstrate the first unconditional evidence surpassing the standard quantum limit of coherent optical communication. We implement a quantum receiver with a simple linear optics configuration and achieve more than 90% of the total detection efficiency of the system. Such an efficient quantum receiver will provide a new way of extending the distance of amplification-free channels, as well as of realizing quantum information protocols based on coherent states and the loophole-free test of quantum mechanics.
AB - The most efficient modern optical communication is known as coherent communication, and its standard quantum limit is almost reachable with current technology. Though it has been predicted for a long time that this standard quantum limit could be overcome via quantum mechanically optimized receivers, such a performance has not been experimentally realized so far. Here we demonstrate the first unconditional evidence surpassing the standard quantum limit of coherent optical communication. We implement a quantum receiver with a simple linear optics configuration and achieve more than 90% of the total detection efficiency of the system. Such an efficient quantum receiver will provide a new way of extending the distance of amplification-free channels, as well as of realizing quantum information protocols based on coherent states and the loophole-free test of quantum mechanics.
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U2 - 10.1103/PhysRevLett.106.250503
DO - 10.1103/PhysRevLett.106.250503
M3 - Article
C2 - 21770619
AN - SCOPUS:79960626970
VL - 106
JO - Physical Review Letters
JF - Physical Review Letters
SN - 0031-9007
IS - 25
M1 - 250503
ER -