An Optimal Polarization-Entanglement Source: Frequency-Converted SPDC with Degeneracy, Indistinguishability, and Ultra-High Purity Configurable Over a Large Spectral Range

• URL: http://arxiv.org/abs/2107.08070v3
• Date: Fri, 24 Jun 2022 21:21:18 GMT
• Title: An Optimal Polarization-Entanglement Source: Frequency-Converted SPDC with Degeneracy, Indistinguishability, and Ultra-High Purity Configurable Over a Large Spectral Range
• Authors: Randy Lafler and R. Nicholas Lanning
• Abstract summary: We present a new SPDC method which circumvents the trade-off problem for polarization-entangled states. Our method can in principle generate optimal polarization-entangled states for polarization-entanglement-based quantum-networking protocols.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Modeling and simulations of entanglement-based quantum-networking protocols commonly assume perfect entangled states. Some investigations have been performed which show how imperfections cause the efficiency of the protocols to rapidly deteriorate. For polarization-entangled states created by SPDC, the fundamentals of phase matching lead to a trade-off problem for the optimal properties of the state. We present a new SPDC method which circumvents the trade-off problem and allows one to obtain degeneracy, indistinguishability, and heralded-single-photon spectral purity greater than 99% for any target SPDC wavelength in the visible and NIR spectrum. Therefore, our method can in principle generate optimal polarization-entangled states for polarization-entanglement-based quantum-networking protocols.

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