Quantum Logic Gates Solutions

Solutions for the exercises in ​Try Your Hand​.

  1. The code for the quantum circuit is:

    Measuring_Two_Qubits_on_a_Real_Computer.qasm
    ​ qreg q[5];
    ​ creg c[5];
    ​ 
    ​ measure q[0] -> c[0];
    ​ measure q[2] -> c[2];

    1. The concatenated string of measured states is 00000.

    2. Output on a simulator will look like this:

      images/quantum_logic_gates/Measuring_Two_Qubits_on_a_Simulator_Output.png

      The output on a simulator is exact: only the 00000 state is seen.

    3. Output on a real quantum computer will look something like the output shown.

      images/quantum_logic_gates/Measuring_Qubits_0_and_2_on_a_Real_Computer_Output.png

      We see that the 00000 state is observed most often. But other states ...

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