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60 lines
1.5 KiB
Python
Executable File
60 lines
1.5 KiB
Python
Executable File
#!/usr/bin/env python3
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"""
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Build a half-adder quantum circuit that takes two bits as input,
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encodes them into qubits, then runs the half-adder circuit calculating
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the sum and carry qubits, observed over 1000 runs of the experiment
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.
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References:
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https://en.wikipedia.org/wiki/Adder_(electronics)
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https://qiskit.org/textbook/ch-states/atoms-computation.html#4.2-Remembering-how-to-add-
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"""
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import qiskit as q
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def half_adder(bit0: int, bit1: int) -> q.result.counts.Counts:
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"""
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>>> half_adder(0, 0)
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{'00': 1000}
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>>> half_adder(0, 1)
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{'01': 1000}
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>>> half_adder(1, 0)
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{'01': 1000}
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>>> half_adder(1, 1)
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{'10': 1000}
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"""
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# Use Aer's qasm_simulator
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simulator = q.Aer.get_backend("qasm_simulator")
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qc_ha = q.QuantumCircuit(4, 2)
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# encode inputs in qubits 0 and 1
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if bit0 == 1:
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qc_ha.x(0)
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if bit1 == 1:
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qc_ha.x(1)
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qc_ha.barrier()
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# use cnots to write XOR of the inputs on qubit2
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qc_ha.cx(0, 2)
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qc_ha.cx(1, 2)
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# use ccx / toffoli gate to write AND of the inputs on qubit3
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qc_ha.ccx(0, 1, 3)
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qc_ha.barrier()
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# extract outputs
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qc_ha.measure(2, 0) # extract XOR value
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qc_ha.measure(3, 1) # extract AND value
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# Execute the circuit on the qasm simulator
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job = q.execute(qc_ha, simulator, shots=1000)
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# Return the histogram data of the results of the experiment.
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return job.result().get_counts(qc_ha)
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if __name__ == "__main__":
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counts = half_adder(1, 1)
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print(f"Half Adder Output Qubit Counts: {counts}")
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