I am experimenting with concepts in Quantum Computing and I have landed on using entangled Qubits to perform certain actions.
My question is this: is it possible to have (let's say) 3 entangled Qubits in a system. If it is, then how much information is retrievable/usable when only 2 of these Qubits are measured? The application I am thinking of is using 2 of the 3 Qubits for a one-time access code and then the 3rd becomes useless (and almost automatically gets locked out).
I realise my mathematics is basic but it is the application I am curious about.
Any help would be appreciated.