मुफ्त क्वांटम सिम्युलेटर

pip install qiskit-aer        # CPU
pip install qiskit-aer-gpu    # GPU (CUDA)

from qiskit import QuantumCircuit
from qiskit_aer import AerSimulator

qc = QuantumCircuit(2, 2)
qc.h(0)
qc.cx(0, 1)
qc.measure([0, 1], [0, 1])

sim = AerSimulator()
job = sim.run(qc, shots=1000)
result = job.result()
print(result.get_counts())  # {'00': 501, '11': 499}

pip install qiskit
pip install qiskit-ibm-runtime

from qiskit_ibm_runtime import QiskitRuntimeService
from qiskit_ibm_runtime import SamplerV2 as Sampler

# Free IBM Quantum account needed
service = QiskitRuntimeService(channel="ibm_quantum")
backend = service.least_busy(simulator=True)

sampler = Sampler(mode=backend)
job = sampler.run([qc])
result = job.result()

pip install cirq

import cirq

q0, q1 = cirq.LineQubit.range(2)
circuit = cirq.Circuit(
    cirq.H(q0),
    cirq.CNOT(q0, q1),
    cirq.measure(q0, q1, key='result')
)

sim = cirq.Simulator()
result = sim.run(circuit, repetitions=1000)
print(result.histogram(key='result'))

pip install pennylane              # default.qubit
pip install pennylane-lightning     # lightning.qubit (C++)
pip install pennylane-lightning-gpu  # GPU

import pennylane as qml
import numpy as np

dev = qml.device("default.qubit", wires=2)
# For GPU: qml.device("lightning.gpu", wires=2)

@qml.qnode(dev)
def bell_state():
    qml.Hadamard(wires=0)
    qml.CNOT(wires=[0, 1])
    return qml.probs(wires=[0, 1])

print(bell_state())  # [0.5, 0., 0., 0.5]

pip install cudaq  # Requires CUDA-capable GPU
# Or use Docker: nvcr.io/nvidia/nightly/cuda-quantum

import cudaq

@cudaq.kernel
def bell_state():
    qvec = cudaq.qvector(2)
    h(qvec[0])
    cx(qvec[0], qvec[1])
    mz(qvec)

counts = cudaq.sample(bell_state, shots_count=1000)
print(counts)  # { 00:507 11:493 }

pip install amazon-braket-sdk

from braket.circuits import Circuit
from braket.devices import LocalSimulator

# Completely free local simulator
device = LocalSimulator()

circuit = Circuit().h(0).cnot(0, 1)
task = device.run(circuit, shots=1000)
result = task.result()
print(result.measurement_counts)