How to define the number of times to run a circuit in Qristal SDK?

Question

I've been starting to create a quantum application using the Qristal SDK. I've gotten it running in a Docker image and successfully printed results from using a qpp back end with a kind of hello world count exercise (trying to see that it does in fact run the algo and return results expected in a quantum query).

What I am having trouble with is how to get this to run at scale. Do I need to continually run the application (as a quantum circuit) over time, or can I scale the qubits being emulated to account for a greater or more accurate outcome?

Here's is the circuit that I've tried.

my_sim.instring = '''
__qpu__ void QUANTUMPROGRAM(qreg q)
{
  OPENQASM 2.0;
  include "qelib1.inc";
  creg c[2];
  h q[0];
  cx q[0], q[1];
  measure q[1] -> c[1];
  measure q[0] -> c[0];
}
'''

Answer 1

That's a good start. The important concept here is that the circuit, even being emulated, is subject to the same challenges of coherence and noise as a physically generated qubit.

Ignoring the Qristal Emulator here, which offers a more accurate model for noise, the core SDK can be approached as a superposition state as you have displayed, but with the advantage of running multiple shots in that instance.

This would use the shot number argument in your config as follows:

my_sim.sn = 100

The number of shots you define will run on the circuit you create, and against the number of qubits you have defined as being emulated. The updated onboarding guide gives a full example of the kind of first program you are running.