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I am trying to execute this code but I am getting this error as 'No memory for the experiment' . Can anyone help me out is there anything else I need to import to get the memory of circuit?

from qiskit.providers.aer import QasmSimulator
# Create a quantum circuit
qc = QuantumCircuit(2, 2)
qc.h(0)
qc.cx(0, 1)
qc.measure([0, 1], [0, 1])
# Get the Qasm simulator and set the backend options
aer_qasm_simulator = Aer.get_backend('qasm_simulator')
# Set the backend options, method set to statevector
options = {'method': 'statevector', 'memory' : True, 'shots':10}
# Execute circuit using the backend options created
job = execute(qc, backend_simulator, backend_options=options)
result = job.result()
# Pull the memory slots for the circuit
memory = result.get_memory(qc)
# Print the results from the memory slots
print('Memory results: ', memory)```
Lauren Yim
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Vish
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1 Answers1

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The problem with your code is that memory and shots are not backend options, but execute parameters:

# Set the backend options, method set to statevector
options = {'method': 'statevector'}
# Execute circuit using the backend options created
job = execute(qc, aer_qasm_simulator, backend_options=options, memory=True, shots=10)

That would fix your issue.

Side note: Qiskit is moving away from the execute model because, among other things, it creates this kind of confusions.

The current (May 2022) way of doing what you are doing is the following:

from qiskit import QuantumCircuit, Aer, transpile
from qiskit.providers.aer import QasmSimulator

# Create a quantum circuit
qc = QuantumCircuit(2, 2)
qc.h(0)
qc.cx(0, 1)
qc.measure([0, 1], [0, 1])

# Get the statevector simulator
aer_simulator_statevector = Aer.get_backend('aer_simulator_statevector')

# Transpile for the backend. Strictly speacking, not necesary in this case
qc = transpile(qc, aer_simulator_statevector)

# Pull the memory slots for the circuit
result = aer_simulator_statevector.run(qc, shots=10, memory=True).result()
memory = result.get_memory(qc)

# Print the results from the memory slots
print('Memory results: ', memory)

Welcome to the StackOverflow community :)

luciano
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