I am a newbie to quantum and have been trying qiskit library for learning quantum computing (in order to explore quantum effects on cryptography). I am basically trying to build Grover Oracle for different symmetric key algorithms. For this I am learning various operations mostly performed by these algos in classical counterparts like XOR, Bit Shift, Addition and Modulo operations etc.
I have created a 4 bit circuit for Full Adder in qiskit and extended it to 8 qbits. But when I am trying it for 12 bits, it raises above error
Simulation failed and returned the following error message:
ERROR: [Experiment 0] Insufficient memory to run circuit circuit-584 using the statevector simulator. Required memory: 67108864M, max memory: 32712M
QiskitError: 'Data for experiment "circuit-584" could not be found.'
I have written a simple quantum implementation of Full Adder and this Error arises when I try to measure the result.
length=12
a = QuantumRegister(length)
b = QuantumRegister(length)
s = QuantumRegister(length)
aux = QuantumRegister(length)
cout = QuantumRegister(1)
cin = QuantumRegister(1)
result = ClassicalRegister(length+1)
input1 = 0xa82
input2 = 0x905
circ=QuantumCircuit(a,b,cin,s,cout,result,aux)
Round_constant_XOR(circ,input1,a,length) # Copying input1 to a
Round_constant_XOR(circ,input2,b,length) # Copying input2 to b
full_adder(circ,a,b,cin,length,s,cout)
#circ.draw(output='mpl')
print("Operations Completed, now measuring qbits\n")
for i in range(length):
circ.measure(s[i],result[i])
circ.measure(cout,result[length])
simulator1 = AerSimulator(method='statevector')
results1 = execute(circ,backend=simulator1).result()
print("Result is: " + str(results1.get_counts(circ)))
plot_histogram(results1.get_counts(circ))
Complete Error is
---------------------------------------------------------------------------
QiskitError Traceback (most recent call last)
C:\PROGRA~1\KMSpico\temp/ipykernel_12724/2309521244.py in <module>
31 simulator1 = AerSimulator(method='statevector')
32 results1 = execute(circ,backend=simulator1).result()
---> 33 print("Result is: " + str(results1.get_counts(circ)))
34 plot_histogram(results1.get_counts(circ))
~\anaconda3\lib\site-packages\qiskit\result\result.py in get_counts(self, experiment)
267 dict_list = []
268 for key in exp_keys:
--> 269 exp = self._get_experiment(key)
270 try:
271 header = exp.header.to_dict()
~\anaconda3\lib\site-packages\qiskit\result\result.py in _get_experiment(self, key)
378
379 if len(exp) == 0:
--> 380 raise QiskitError('Data for experiment "%s" could not be found.' % key)
381 if len(exp) == 1:
382 exp = exp[0]
Does the problem lie in number of qbits simulator is able to handle or anything else. As I eventually want to perform different operations for at least 128 qbits registers in order to simulate practical symmetric algos.
