Impact of Polarization Distinguishability on Coherence in QIUP

• URL: http://arxiv.org/abs/2507.06879v1
• Date: Wed, 09 Jul 2025 14:16:46 GMT
• Title: Impact of Polarization Distinguishability on Coherence in QIUP
• Authors: Gaytri Arya, Paolo Bianchini, Alberto Diaspro,
• Abstract summary: Quantum imaging with undetected photons (QIUP) is a promising technique for non-invasive imaging.<n>Recent studies have investigated the role of polarization in QIUP schemes.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Quantum imaging with undetected photons (QIUP) is a promising technique for non-invasive imaging, particularly at wavelengths where detectors are inefficient or unavailable. Recent studies have investigated the role of polarization in QIUP schemes. In this work, we examine whether post-generation optical elements can recover interference when the signal photons are distinguishable in polarization at the source. Specifically, we employ a Mach-Zehnder interferometer after the photon pairs are generated from two nonlinear crystals. Our results indicate that polarization distinguishability at the time of generation leads to a loss of interference that cannot be restored by post-generation optical arrangements. This highlights the fundamental importance of indistinguishability at the source for maintaining coherence in QIUP systems.

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