> Further, we use this mapping to prove that any problem efficiently solvable by a quantum algorithm can be recast as a problem involving a network of coupled oscillators, albeit exponentially many of them.
Is this a new result, giving that quantum field theory is described in terms of quantum harmonic oscillators?
I don't know about Android, but AMD CPUs support encrypting regions of physical memory with different keys which are accessible only to one particular VM running, but also not accessible to the host: