Journal
QUANTUM SCIENCE AND TECHNOLOGY
Volume 1, Issue 1, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/2058-9565/1/1/015004
Keywords
frequency-entangled qudits; Hong-Ou-Mandel interference; spectral engineering of biphotons
Funding
- MEXT [15K17477]
- ImPACT Program of Council for Science, Technology and Innovation (Cabinet Office, Government of Japan)
- Grants-in-Aid for Scientific Research [15K17477] Funding Source: KAKEN
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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 qudts with 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.
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