No, among other reasons, because it's not possible to entangle a proton and an anti-proton, since they carry different charges. It might be useful to learn about superselection rules in quantum mechanics.

So such a ``femto particle'' simply can't exist (and even if it could, it couldn't affect Alzheimer's disease).

``Femto'' refers to the size of particles, not to any entanglement properties. Femtoparticles would have typical sizes of 10-15 m. Cf. https://en.wikipedia.org/wiki/Femtotechnology

i expect that the Nanotechnology and femto particle can be integrated into neuroscience to fight against neurodegenerative diseases. Primary research studies in using nanoparticles to cure Alzheimer disease (AD) are promising but are still in need for more investigations.

It’s not at all obvious. There’s nothing special about nanoparticles or particles of smaller size that makes them especially relevant for neurodegenerative diseases. This doesn’t have anything to do with healing, so it would be good to refrain from just throwing darts at random. It's distressing how many people just use buzzwords like ``nanotechnology'' or ``femtoparticles'', just to attract attention. It's not a lack of tracking devices that is an obstacle to treating Alzheimer's or other neurodegenerative diseases, so it would be better to study medicine, if one is interested in the subject, in order to contribute to the signal, instead of contributing to the noise.

I attended a talk by Professor Amit Dinda, Secretary of Indian Society for Nano-Medicine on the occasion of the D' day of School of Physical Sciences, Jawaharlal Nehru University; my alma matar. In that presentation, a concern was pressed upon the audience by the Doctor. He said these gold nano - particles are not biodegradable. We do not know if they are flushed out of the system. Else could be harmful. It made me to think and go for femto size particles.