Quantum Cryptography Solutions
Solutions for the exercises in Try Your Hand.
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False. 0000000 is just the initializing string for the quantum circuit.
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False. The secret key can’t be determined at this stage.
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False. The random key is explicitly set by Alice before putting the qubits in a blended state.
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True. The random key is the value of the qubits before applying the H gates that put them in a blended state.
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False. The secret key can’t be determined at this stage.
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Bob’s circuit is shown in the following figure:

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