Endian

I was asking myself the wrong question ie how does repeating applications

of U gates make anwer more precise. In fact, it doesn't; it makes them more

accurate.(And since it is a matter of phases, the value of qubit(0) can change

as the circuit becomes more elaborate.)

Answers are more precise when one adds qubits, because each translates

to one more binary digit. And Qiskit is little-endian!!

You

Is IBM Quantum Computing little-endian? Explain!

Copilot

Yes, IBM Quantum Computing uses a little-endian convention in its Qiskit framework. This means that the least significant bit (or qubit) is stored at the lowest memory address, and the most significant bit is stored at the highest memory address12.

In practical terms, when you work with quantum circuits in Qiskit, the qubits are indexed starting from 0. For example, in a two-qubit system, qubit 0 is the least significant and qubit 1 is the most significant1. This ordering is consistent across various operations, such as when interpreting the results of measurements or when applying gates2.

If you have any specific questions about how this affects your quantum computing tasks, feel free to ask!

                                                                         

                                              

                                                     source: Wikipedia