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Polarization-entangled photon-pair sources from microring resonators for integrated quantum photonic circuits

Qianni Zhang

Published Jan 1, 2025• 0 citations
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Abstract

HKUST Electronic Theses Polarization-entangled photon-pair sources from microring resonators for integrated quantum photonic circuits by Zhang Qianni thesis 2025 1 online resource (xxxi, 161 pages) : illustrations (some color) Not presently available for public access at author’s request *CONFIDENTIAL* Ph.D.…Read more ›

DOI
10.14711/thesis-991013401043803412

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Polarization-entangled photon pair sources exhibiting nonlocal quantum correlations are crucial to developments of quantum computing, quantum communications, quantum cryptography, and quantum sensing technologies. On-chip polarization entanglement generation thus constitutes one enabling component for integrated quantum photonic circuits. Here, we present to our knowledge the first polarization-entangled photon pair sources in a silicon nitride platform for integrated quantum photonic circuits. We demonstrate the generation of a polarization-entangled state by adopting a configuration comprising dual microring resonators, with nearly degenerate transverse electric and transverse magnetic polarized cavity resonances for the two resonators coupled in series to a common bus waveguide. We measure two-photon interference and quantum state tomography to characterize the polarization entanglement of the generated state and to reconstruct the density matrix. Our experiments reveal a visibility of 96.4% ± 3.1% and of 86.7% ± 3.2% with the |H⟩ and |V⟩ bases, respectively (and a visibility of 89.4% ± 6.6% and 81.3% ± 7.3% with the |D⟩ and |A⟩ bases), and a fidelity of ∼75.7% from the tomographic reconstructed density matrix.

Optics Express•May 27, 2024•10 citations
HKUST Electronic Theses Polarization-entangled photon-pair sources from microring resonators for integrated quantum photonic circuits by Zhang Qianni thesis 2025 1 online resource (xxxi, 161 pages) : illustrations (some color) Not presently available for public access at author’s request CONFIDENTIAL Ph.D.…Read more ›
Our research focused on developing integrated pair sources using silicon photonics technology. This device uses a microring resonator for pair generation. Activities performed this year include measurements of silicon photonic entangled-pair and heralded single photon generation using an integrated photonic microchip that includes the pair generation resonator as well as tunable filters. Summary of a Project Outcomes report of research funded by the U.S. National Science Foundation under Project Number 1640968 (Year 3).
Polarization-entangled photon pair sources exhibiting nonlocal quantum correlations are crucial to developments of quantum computing, quantum communications, quantum cryptography, and quantum sensing technologies. On-chip polarization entanglement generation thus constitutes one enabling component for integrated quantum photonic circuits. Here, we present to our knowledge the first polarization-entangled photon pair sources in a silicon nitride platform for integrated quantum photonic circuits. We demonstrate the generation of a polarization-entangled state by adopting a configuration comprising dual microring resonators, with nearly degenerate transverse electric and transverse magnetic polarized cavity resonances for the two resonators coupled in series to a common bus waveguide. We measure two-photon interference and quantum state tomography to characterize the polarization entanglement of the generated state and to reconstruct the density matrix. Our experiments reveal a visibility of 96.4% ± 3.1% and of 86.7% ± 3.2% with the |H⟩ and |V⟩ bases, respectively (and a visibility of 89.4% ± 6.6% and 81.3% ± 7.3% with the |D⟩ and |A⟩ bases), and a fidelity of ∼75.7% from the tomographic reconstructed density matrix.