Electron Spin as a Quantum Information Carrier A Testable Protocol via Single-Electron Double-Slit Encoding

This is the revised version of our manuscript *"Electron Spin as a Quantum Information Carrier: A Testable Protocol via Single-Electron Double-Slit Encoding"*. In this updated version, we have:- Introduced complete mathematical derivations linking the spin phase Φ with interference fringe visibility (V = |cos(Φ/2)|),- Defined a binary spin-based information encoding protocol,- Added a detailed closed-box single-electron double-slit experimental proposal,- Incorporated dual independent readout strategies: interference visibility analysis and multichannel Mott polarimetry,- Included comprehensive control experiments and a full systematic error budget. This revision addresses previous limitations and significantly strengthens the theoretical framework and experimental feasibility. A preprint version is also being prepared via **Springer Nature's In Review / Research Square** service.