Two-Dimensional Graphene Multilayer as Quantum Photon Receiver: Replacing 0D Point Defects with 2D Capture Surfaces for Entanglement-Assisted Optical Interferometry

Recent demonstration of entanglement-assisted non-local optical interferometry using siliconvacancy (SiV) quantum memories in diamond nanocavities (Stas et al., Nature 651, 326–332, 2026) opens a path toward quantum-enhanced telescope arrays. However, the SiV center is a zerodimensional point defect with a capture cross-section orders of magnitude smaller than the incident photon beam, fundamentally limiting sensitivity for faint astronomical sources. Here we propose replacing the 0D point defect with a two-dimensional graphene multilayer receiver. Each graphene layer absorbs exactly πα = 2.293% of incident radiation across the full electromagnetic spectrum (Nair et al., Science 320, 1308, 2008), where α is the fine-structure constant. A stack of N layers absorbs A = 1 − (1 − πα)ᴺ, yielding 21% capture at 10 layers (3.4 nm) and 69% at 50 layers (17 nm). The transition from 0D to 2D increases the effective photon capture area by an estimated factor of 10⁶ or more. We pose the open experimental question: can engineered graphene multilayers maintain the quantum coherence required for entanglement-assisted phase measurements? If so, the photon collection bottleneck of current quantum receiver architectures is eliminated.