Time limit error for Rigetti Backend about qdk-python

[gitpold]

Interestingly there seem to have been some changes in the last few days.

Without any changes to the code, the received error message is now:

error_data={'code': 'InvalidInputData', 'message': 'Execution timed out.  Note: time limit: 10 seconds.'}

The time limit has increased from 0 seconds to 10 seconds.

Additionally I am now able to consistently run circuits succesfully, which previously failed, but further increasing the size of the circuit still leads to the error message above...

It definitly makes the impression as if this time limit mentioned in the error message is what is preventing me from executing larger quantum circuits on the Aspen M3 or M2. And while it apparently can be changed, I am not sure if or how this limit could be increased further.

[l-enloe]

Hi, can you share the circuit you used to help us reproduce the issue?

[gitpold]

Hi, thanks for getting back to this.

The following circuit is what I used for testing (not the complete circuit I would like to run):

circuit = QuantumCircuit.from_qasm_str("""OPENQASM 2.0;
include "qelib1.inc";
qreg q1[12];
creg c0[3];
h q1[0];
h q1[1];
h q1[2];
barrier q1[0],q1[1],q1[2],q1[3],q1[4],q1[5],q1[6],q1[7],q1[8],q1[9],q1[10],q1[11];
ccx q1[0],q1[11],q1[3];
ccx q1[1],q1[2],q1[11];
ccx q1[0],q1[11],q1[3];
ccx q1[1],q1[2],q1[11];
measure q1[0] -> c0[2];
measure q1[1] -> c0[1];
measure q1[2] -> c0[0];""")

In most cases this leads to the error message above after around 20 seconds.
Interestingly, a few times this circuit completed successfully but only after being in the "Executing" state for mutliple hours.

I hope that helps, let me know if you need more information!