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Spectrally separable photon-pair generation in dispersion engineered thin-film lithium niobate

Xin, C. J. and Mishra, Jatadhari and Chen, Changchen and Zhu, Di and Shams-Ansari, Amirhassan and Langrock, Carsten and Sinclair, Neil and Wong, Franco N. C. and Fejer, M. M. and Lončar, Marko (2022) Spectrally separable photon-pair generation in dispersion engineered thin-film lithium niobate. Optics Letters, 47 (11). pp. 2830-2833. ISSN 0146-9592. doi:10.1364/ol.456873.

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Existing nonlinear-optic implementations of pure, unfiltered heralded single-photon sources do not offer the scalability required for densely integrated quantum networks. Additionally, lithium niobate has hitherto been unsuitable for such use due to its material dispersion. We engineer the dispersion and the quasi-phasematching conditions of a waveguide in the rapidly emerging thin-film lithium niobate platform to generate spectrally separable photon pairs in the telecommunications band. Such photon pairs can be used as spectrally pure heralded single-photon sources in quantum networks. We estimate a heralded-state spectral purity of >94% based on joint spectral intensity measurements. Further, a joint spectral phase-sensitive measurement of the unheralded time-integrated second-order correlation function yields a heralded-state purity of (86 ± 5)%.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Xin, C. J.0000-0002-9596-1407
Mishra, Jatadhari0000-0002-2433-4318
Chen, Changchen0000-0001-7811-1673
Zhu, Di0000-0003-0210-1860
Shams-Ansari, Amirhassan0000-0002-2165-7832
Langrock, Carsten0000-0002-2947-5312
Fejer, M. M.0000-0002-5512-1905
Lončar, Marko0000-0002-5029-5017
Additional Information:© 2022 Optica Publishing Group. Received 25 February 2022; revised 14 April 2022; accepted 5 May 2022; posted 6 May 2022; published 26 May 2022. The authors thank M. Yeh, S. Ghosh, M. Jankowski, M. Yu, B. Desiatov, and P. G. Kwiat for helpful discussions and assistance with the experiment. N.S. acknowledges funding from the AQT Intelligent Quantum Networks and Technologies (INQNET) research program. Funding. National Science Foundation (CCF-1918549, DMR-1231319, ECCS-1541959, ECCS-1542152, ECCS-1839197, ECCS-2026822, EEC-1941583, EFMA-1741651, OIA-2040695, OMA-2137723); U.S. Department of Energy (DE-AC02-76SF00515, DE-SC0020376); Army Research Office (W911NF2010248); National Center for Research Resources (S10RR02557401); Nippon Telegraph and Telephone (NTT Research 146395); Harvard Quantum Initiative (HQI Seed Funding). Data availability. Data underlying the results presented in this paper are not publicly available at this time but may be obtained from the authors upon reasonable request. Disclosures: M.L.: HyperLight Corporation (I,S).
Funding AgencyGrant Number
Department of Energy (DOE)DE-AC02-76SF00515
Department of Energy (DOE)DE-SC0020376
Army Research Office (ARO)W911NF2010248
National Center for Research Resources (NCRR)S10RR02557401
NTT Research146395
Harvard Quantum InitiativeUNSPECIFIED
AQT Intelligent Quantum Networks and Technologies (INQNET)UNSPECIFIED
Issue or Number:11
Record Number:CaltechAUTHORS:20220722-768574000
Persistent URL:
Official Citation:C. J. Xin, Jatadhari Mishra, Changchen Chen, Di Zhu, Amirhassan Shams-Ansari, Carsten Langrock, Neil Sinclair, Franco N. C. Wong, M. M. Fejer, and Marko Lončar, "Spectrally separable photon-pair generation in dispersion engineered thin-film lithium niobate," Opt. Lett. 47, 2830-2833 (2022)
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:115758
Deposited By: George Porter
Deposited On:26 Jul 2022 21:07
Last Modified:26 Jul 2022 21:07

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