TY - JOUR
T1 - Simple method of generating and distributing frequency-entangled qudits
AU - Jin, Rui Bo
AU - Shimizu, Ryosuke
AU - Fujiwara, Mikio
AU - Takeoka, Masahiro
AU - Wakabayashi, Ryota
AU - Yamashita, Taro
AU - Miki, Shigehito
AU - Terai, Hirotaka
AU - Gerrits, Thomas
AU - Sasaki, Masahide
N1 - Funding Information:
The authors are grateful to I A Walmsley and C Ren for insightful discussions, and to K Wakui for assistance in the experiment. This work is supported by MEXT Grant-in-Aid for Young Scientists (B)15K17477, and the ImPACT Program of Council for Science, Technology and Innovation (Cabinet Office, Government of Japan).
Publisher Copyright:
© 2016 IOP Publishing Ltd.
PY - 2016/8/1
Y1 - 2016/8/1
N2 - High-dimensional, frequency-entangled photonic quantum bits (qudits for d-dimension) are promising resources for quantum information processing in an optical fiber network and can also be used to improve channel capacity and security for quantum communication. However, up to now, it is still challenging to prepare high-dimensional frequency-entangled qudits in experiments, due to technical limitations. Here we propose and experimentally implement a novel method for a simple generation of frequency-entangled qudtswith d > 10 without the use of any spectral filters or cavities. The generated state is distributed over 15 kmin total length. This scheme combines the technique of spectral engineering of biphotons generated by spontaneous parametric down-conversion and the technique of spectrally resolved Hong-Ou-Mandel interference. Our frequency-entangled qudits will enable quantum cryptographic experiments with enhanced performances. This distribution of distinct entangled frequency modes may also be useful for improved metrology, quantum remote synchronization, as well as for fundamental test of stronger violation of local realism.
AB - High-dimensional, frequency-entangled photonic quantum bits (qudits for d-dimension) are promising resources for quantum information processing in an optical fiber network and can also be used to improve channel capacity and security for quantum communication. However, up to now, it is still challenging to prepare high-dimensional frequency-entangled qudits in experiments, due to technical limitations. Here we propose and experimentally implement a novel method for a simple generation of frequency-entangled qudtswith d > 10 without the use of any spectral filters or cavities. The generated state is distributed over 15 kmin total length. This scheme combines the technique of spectral engineering of biphotons generated by spontaneous parametric down-conversion and the technique of spectrally resolved Hong-Ou-Mandel interference. Our frequency-entangled qudits will enable quantum cryptographic experiments with enhanced performances. This distribution of distinct entangled frequency modes may also be useful for improved metrology, quantum remote synchronization, as well as for fundamental test of stronger violation of local realism.
KW - Frequency-entangled qudits
KW - Hong-Ou-Mandel interference
KW - Spectral engineering of biphotons
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U2 - 10.1088/2058-9565/1/1/015004
DO - 10.1088/2058-9565/1/1/015004
M3 - Article
AN - SCOPUS:85015731744
SN - 2058-9565
VL - 1
JO - Quantum Science and Technology
JF - Quantum Science and Technology
IS - 1
M1 - 015004
ER -