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Designing high-power, octave spanning entangled photon sources for quantum spectroscopy

Szoke, S. and He, M. and Hickam, B. P. and Cushing, S. K. (2021) Designing high-power, octave spanning entangled photon sources for quantum spectroscopy. Journal of Chemical Physics, 154 (24). Art. No. 244201. ISSN 0021-9606. doi:10.1063/5.0053688.

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Entangled photon spectroscopy is a nascent field that has important implications for measurement and imaging across chemical, biology, and materials fields. Entangled photon spectroscopy potentially offers improved spatial and temporal-frequency resolutions, increased cross sections for multiphoton and nonlinear measurements, and new abilities in inducing or measuring quantum correlations. A critical step in enabling entangled photon spectroscopies is the creation of high-flux entangled sources that can use conventional detectors as well as provide redundancy for the losses in realistic samples. Here, we report a periodically poled, chirped, lithium tantalate platform that generates entangled photon pairs with ∼10⁻⁷ efficiency. For a near watt level diode laser, this results in a near μW-level flux. The single photon per mode limit that is necessary to maintain non-classical photon behavior is still satisfied by distributing this power over up to an octave-spanning bandwidth. The spectral–temporal photon correlations are observed via a Michelson-type interferometer that measures the broadband Hong–Ou–Mandel two-photon interference. A coherence time of 245 fs for a 10 nm bandwidth in the collinear case and a coherence time of 62 fs for a 125 nm bandwidth in the non-collinear case are measured using a CW pump laser and, essentially, collecting the full photon cone. We outline in detail the numerical methods used for designing and tailoring the entangled photons source, such as changing center wavelength or bandwidth, with the ultimate aim of increasing the availability of high-flux UV–Vis entangled photon sources in the optical spectroscopy community.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Hickam, B. P.0000-0003-2120-4769
Cushing, S. K.0000-0003-3538-2259
Additional Information:© 2021 The Author(s). Published under an exclusive license by AIP Publishing. Submitted: 9 April 2021; Accepted: 9 June 2021; Published Online: 23 June 2021. This paper is part of the JCP Special Topic on Quantum Light. This material is based on the work supported by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, under Award No. DE-SC0020151. DATA AVAILABILITY. The data that support the findings of this study are available within the article and its supplementary material.
Funding AgencyGrant Number
Department of Energy (DOE)DE-SC0020151
Issue or Number:24
Record Number:CaltechAUTHORS:20210626-225301589
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:109619
Deposited By: George Porter
Deposited On:28 Jun 2021 19:55
Last Modified:16 Aug 2022 19:15

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