The following results in the figure were achieved using Qiskit pulse by doing the following pulse sequence;

{ $\frac{\pi}{2}$, delay $\tau$, $\pi$, delay $\tau$, $\frac{\pi}{2}$}

enter image description here

The figure is the average of 1024 shots.

This experiment looks very similar to applying the following sequence which is done to measure the T1 time of a qubit which is the it takes a qubit to decay to its ground state from its excited state;

{ $\pi$, delay $\tau$, $\pi$, delay $\tau$, $\pi$ }

I am trying to understand what the first experiment is used for and what the the results from the figure even show.


Looks like a T2 experiment with an echo (i.e., a Hahn echo experiment)

  • $\begingroup$ Are you talking about the Hahn echo experiment? If you are then I thought it was that too but in the Qiskit textbook, the graph grows exponentially rather than decaying exponentially like in the figure in my question. qiskit.org/textbook/ch-quantum-hardware/… $\endgroup$
    – John
    Jul 1 at 16:20
  • $\begingroup$ I guess that it depends on whether the y axis is the probability to measure 0 or 1 $\endgroup$ Jul 1 at 20:51

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