The virtual levels do not represent the floors of the building, they simply represent parts of the computer system.
2.
The intermediate, virtual level is represented by the dashed line, and is red-detuned with respect to the real excited level, | e \ rangle.
3.
With virtualization, NSA saw a way to preserve periods processing on a virtual level, no longer needing the physical system to be sanitized by performing all processing within dedicated, system-high VMs . To make MSL work in a virtual environment, however, it was necessary to find a way to securely control the virtual session manager and ensure that no compromising activity directed at one VM could compromise another.