Spectrally separable photon-pair generation in dispersion engineered thin-film lithium niobate
Abstract
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)%.
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).Attached Files
Accepted Version - 2202.12469.pdf
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Additional details
- Eprint ID
- 115758
- Resolver ID
- CaltechAUTHORS:20220722-768574000
- NSF
- CCF-1918549
- NSF
- DMR-1231319
- NSF
- ECCS-1541959
- NSF
- ECCS-1542152
- NSF
- ECCS-1839197
- NSF
- ECCS-2026822
- NSF
- EEC-1941583
- NSF
- EFMA-1741651
- NSF
- ITE-2040695
- NSF
- OMA-2137723
- 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 Research
- 146395
- Harvard Quantum Initiative
- AQT Intelligent Quantum Networks and Technologies (INQNET)
- Created
-
2022-07-26Created from EPrint's datestamp field
- Updated
-
2022-07-26Created from EPrint's last_modified field
- Caltech groups
- INQNET