Related papers: Optimal filtering and generation of entangled photons for quantum applications in the presence of noise

Optimal filtering and generation of entangled photons for quantum applications in the presence of noise

URL: http://arxiv.org/abs/2510.06536v1
Date: Wed, 08 Oct 2025 00:21:43 GMT
Title: Optimal filtering and generation of entangled photons for quantum applications in the presence of noise
Authors: Jordan M. Thomas, Andrew R. Cameron, Akil Pathiranage, Si Xie, Raju Valivarthi, Panagiotis Spentzouris, Maria Spiropulu, Cristián Peña, Prem Kumar,
Abstract summary: We investigate filtering for multiphoton applications based on entanglement and interference.<n>We co-propagate time-bin-entangled photons at wavelengths compatible with erbium-ion quantum memories.<n>We find a trade-off between improving noise impact and single-mode purity.
Score: 0.8186476542367552
License: http://creativecommons.org/licenses/by/4.0/
Abstract: Filtering is commonly used in quantum optics to reject noise photons, and also to enable interference between independent photons. However, filtering the joint spectrum of photon pairs can reduce the inherent coincidence probability or loss-independent heralding efficiency. Here, we investigate filtering for multiphoton applications based on entanglement and interference (e.g., quantum teleportation). We multiplex C-band entangled photons and C-band classical communications into the same long-distance fibers, which enables scalable low-loss quantum networking but requires filtering of spontaneous Raman scattering noise from classical light. Using tunable-bandwidth filters, low-jitter detectors, and polarization filters, we co-propagate time-bin-entangled photons at wavelengths compatible with erbium-ion quantum memories (1536.5 nm) and 10-Gbps C-band classical data over 25 km/25 km of standard fiber. Narrow filtering enables mW-level C-band power, which exceeds comparable studies by roughly an order of magnitude and could feasibly support Tbps classical rates. We evaluate how performance depends on pump and filter bandwidths, multipair emission, filter shapes, loss, phase matching, and how quantum information is measured. We find a trade-off between improving noise impact and single-mode purity and discuss mitigation methods toward optimal multiphoton applications. Importantly, these results apply to noise in free space and in quantum devices (sources, frequency converters, switches, detectors, etc.) and provide insight on filter-induced degradation of single-photon purity and rates even in noise-free environments.

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