Quantum Radar Cross Section with two-photon entangled states

Quantum Physics [Submitted on 4 Jun 2026] Quantum Radar Cross Section with two-photon entangled states Sunghwa Kang, Jihwan Kim, Zaeill Kim, Duk Y. Kim, Yong Sup Ihn, Su-Yong Lee, Sean Crowe, Stefan Evans, Marcio de Andrade, Joanna Ptasinski We study two-photon entangled states for quantum radar cross section (QRCS), which is an extension of a single-photon QRCS formula. Since signal-idler entanglement does not provide any enhancement of the QRCS [Brandsema's PhD Thesis (2017)], we focus on signal-signal entanglement and derive the corresponding biphoton QRCS. We show that it can provide an enhancement over the single-photon QRCS and two-photon separable QRCS, where the performance is evaluated for various two-dimensional target geometries in monostatic/bistatic configurations. Furthermore, using the double-Gaussian approximation, we derive QRCS formula for biphoton states with arbitrary degree of entanglement and compute the resulting scattering patterns. Comments: 6 pages, 8 figures Subjects: Quantum Physics (quant-ph) Cite as: arXiv:2606.05603 [quant-ph]   (or arXiv:2606.05603v1 [quant-ph] for this version)   https://doi.org/10.48550/arXiv.2606.05603 Focus to learn more Submission history From: Su-Yong Lee [view email] [v1] Thu, 4 Jun 2026 02:27:14 UTC (1,317 KB) Access Paper: HTML (experimental) view license Current browse context: quant-ph < prev   |   next > new | recent | 2026-06 References & Citations INSPIRE HEP NASA ADS Google Scholar Semantic Scholar Export BibTeX Citation Bookmark Bibliographic Tools Bibliographic and Citation Tools Bibliographic Explorer Toggle Bibliographic Explorer (What is the Explorer?) Connected Papers Toggle Connected Papers (What is Connected Papers?) Litmaps Toggle Litmaps (What is Litmaps?) scite.ai Toggle scite Smart Citations (What are Smart Citations?) Code, Data, Media Demos Related Papers About arXivLabs Which authors of this paper are endorsers? | Disable MathJax (What is MathJax?)