Quantum State Interferography
Quantum State Interferography (QSI) is a resource-efficient method for estimating quantum states using interference patterns, offering a faster alternative to traditional Quantum State Tomography (QST). It enables single-shot measurements by analyzing visibility and phase shifts, without disturbing the system. Validated through photonic experiments, QSI works for both pure and mixed states and scales linearly with system dimension—ideal for high-dimensional qudits and entangled systems. Its non-invasive nature and compatibility with quantum computing platforms make it valuable for real-time diagnostics and scalable quantum technologies. Developed by Indian research institutes and published in Physical Review Letters, QSI marks a shift toward pattern-based quantum inference and automated state analysis.
