(Solved): solve this question please. : a) Derive the secret key from the following communication between Al ...

a) Derive the secret key from the following communication between Alice and Bob using BB84 protocol (They may choose $\to$ and $\nearrow$ to represent $0$, and $\uparrow$ and to represent $1$ ). KEY: b) Derive the key from the following communication between Alice and Bob using BB84 protocol in the presence of an eavesdropper. Mark also erroneous bits. KEY: c) Write down all you know about the quantum bit "qubit", quantum superposition and quantum entanglement? d) Quantum gates: Define the following quantum gates, show matrix representation, plot the quantum circuit and indicate the truth table. a. CNOT Gate b. $\mathbf{X}$ Gate c. H Hadamard gate d. Z Gate e) What is the expected measurement histogram at left hand side and the outputs produced by the last two circuits? $|0⟩$ $10\}$ $10\}$ (0) (0)