Quantum Computing

Quantum Cryptography Solutions

Solutions for the exercises in ​Try Your Hand​.

1. 1. 1. False. 0000000 is just the initializing string for the quantum circuit.

      2. False. The secret key can’t be determined at this stage.

      3. False. The random key is explicitly set by Alice before putting the qubits in a blended state.

      4. True. The random key is the value of the qubits before applying the H gates that put them in a blended state.

      5. False. The secret key can’t be determined at this stage.

   2. Bob’s circuit is shown in the following figure:

      

   3. Over the classical channel, Alice and Bob declare the qubits on which each used the H gates. So, Alice would say qubits ...