NDLI: Excess noise in bandwidth-resource-efficient entanglement distribution

Content Provider	IEEE Xplore Digital Library
Author	Han Chuen Lim Yoshizawa, A. Tsuchida, H. Kikuchi, K.
Copyright Year	2009
Description	Author affiliation: Photonics Research Institute, National Institute of Advanced Industrial Science and Technology (AIST). 1-1-1, Umezono, Tsukuba, Ibaraki, 305-8568, Japan (Yoshizawa, A.; Tsuchida, H.) \|\| Graduate School of Engineering, The University of Tokyo. 7-3-1, Hongo, Bunkyo-ku, 113-8656, Japan (Han Chuen Lim; Kikuchi, K.)
Abstract	Entanglement distribution over optical fiber is an important backbone technology that would enable quantum communication applications such as quantum cryptography and quantum teleportation within local-area networks [1]. Although photons are excellent carriers of quantum entanglement, they experience loss during transmission and cannot be amplified. This generally leads to very low distribution rates. From an engineering point of view, photon transmission rate should be maximized by full utilization of the available optical fiber transmission bandwidth. As a first step towards this goal, we have proposed a broadband source of high quality polarization-entangled photon-pairs [2] and demonstrated wavelength-multiplexed entanglement distribution over optical fiber [3]. By further combining the outputs from two broadband entangled photon-pair sources as shown in Fig. 1, very efficient fiber transmission bandwidth utilization for entanglement distribution can in principle be achieved. In this work, we emphasize the importance of properly designing a bandwidth-resourceefficient entanglement distribution system. In particular, we point out that inappropriate setting of wavelength demultiplexing channel bandwidth with respect to pump spectral width could affect entanglement quality. It is widely known that the photon coherence length can be made longer than pump pulsewidth by narrowband filtering so as to improve photon temporal coherence [4], however, the excess noise that accompanies narrowband filtering has not been studied. The use of narrowband sources of entangled photon-pairs avoids this problem but one needs to wavelength-multiplex many such narrowband sources in order to implement bandwidth-resource-efficient entanglement distribution. We show how to reduce excess noise while maintaining a high photon temporal coherence for a bandwidth-resource-efficient system that uses broadband sources (Fig. 1).
Starting Page	1
Ending Page	1
File Size	1715269
Page Count	1
File Format	PDF
ISBN	9781424440795
DOI	10.1109/CLEOE-EQEC.2009.5191793
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2009-06-14
Publisher Place	Germany
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Optical fibers Optical fiber polarization Space vector pulse width modulation Quantum entanglement Filtering Noise reduction Optimized production technology Bandwidth Coherence Narrowband
Content Type	Text
Resource Type	Article

Sl.	Authority	Responsibilities	Communication Details
1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
6	Contents and Copyright Issues	Queries related to content curation and copyright issues	content@ndl.gov.in
7	National Digital Library of India Club (NDLI Club)	Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach	clubsupport@ndl.gov.in
8	Digital Preservation Centre (DPC)	Assistance with digitizing and archiving copyright-free printed books	dpc@ndl.gov.in
9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in

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