• Members 8 posts
    Sept. 3, 2021, 12:59 a.m.

    When I run the circuit on the real device, the result will return a series of digits. Do they represent the virtual qubits (logical qubits) or physical qubits? What is the order of the bit strings?

  • Members 12 posts
    Oct. 18, 2021, 11:14 p.m.

    Please read this intro chapter from qiskit-textbook:

    So far, the readout from most could-access hardware directly use physical qubits (you can also view it as using one physical qubit to encode a logical qubit). The order of the bit strings depends on the platform. In Qiskit, start reading the binary string from the last qubit . This is because people want to know the largest binary base first (explained in qiskit-textbook). For example,

    9213 = (1\times 2^{13}) + (0\times 2^{12}) + \cdots

    This means we will start reading the measurement result from the 14th qubit and have $9213 \rightarrow 10001111111101$. Things will be reversed in other platforms like Cirq and PaddleQuantum.