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70 lines
2.9 KiB
Python
70 lines
2.9 KiB
Python
#!/usr/bin/env python3
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"""
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Build quantum teleportation circuit using three quantum bits
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and 1 classical bit. The main idea is to send one qubit from
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Alice to Bob using the entanglement properties. This experiment
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run in IBM Q simulator with 1000 shots.
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.
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References:
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https://en.wikipedia.org/wiki/Quantum_teleportation
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https://qiskit.org/textbook/ch-algorithms/teleportation.html
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"""
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import numpy as np
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import qiskit
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from qiskit import Aer, ClassicalRegister, QuantumCircuit, QuantumRegister, execute
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def quantum_teleportation(
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theta: float = np.pi / 2, phi: float = np.pi / 2, lam: float = np.pi / 2
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) -> qiskit.result.counts.Counts:
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"""
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# >>> quantum_teleportation()
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#{'00': 500, '11': 500} # ideally
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# ┌─────────────────┐ ┌───┐
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#qr_0: ┤ U(π/2,π/2,π/2) ├───────■──┤ H ├─■─────────
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# └──────┬───┬──────┘ ┌─┴─┐└───┘ │
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#qr_1: ───────┤ H ├─────────■──┤ X ├──────┼───■─────
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# └───┘ ┌─┴─┐└───┘ │ ┌─┴─┐┌─┐
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#qr_2: ───────────────────┤ X ├───────────■─┤ X ├┤M├
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# └───┘ └───┘└╥┘
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#cr: 1/═══════════════════════════════════════════╩═
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Args:
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theta (float): Single qubit rotation U Gate theta parameter. Default to np.pi/2
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phi (float): Single qubit rotation U Gate phi parameter. Default to np.pi/2
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lam (float): Single qubit rotation U Gate lam parameter. Default to np.pi/2
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Returns:
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qiskit.result.counts.Counts: Teleported qubit counts.
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"""
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qr = QuantumRegister(3, "qr") # Define the number of quantum bits
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cr = ClassicalRegister(1, "cr") # Define the number of classical bits
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quantum_circuit = QuantumCircuit(qr, cr) # Define the quantum circuit.
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# Build the circuit
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quantum_circuit.u(theta, phi, lam, 0) # Quantum State to teleport
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quantum_circuit.h(1) # add hadamard gate
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quantum_circuit.cx(
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1, 2
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) # add control gate with qubit 1 as control and 2 as target.
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quantum_circuit.cx(0, 1)
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quantum_circuit.h(0)
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quantum_circuit.cz(0, 2) # add control z gate.
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quantum_circuit.cx(1, 2)
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quantum_circuit.measure([2], [0]) # measure the qubit.
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# Simulate the circuit using qasm simulator
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backend = Aer.get_backend("aer_simulator")
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job = execute(quantum_circuit, backend, shots=1000)
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return job.result().get_counts(quantum_circuit)
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if __name__ == "__main__":
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print(
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"Total count for teleported state is: "
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f"{quantum_teleportation(np.pi/2, np.pi/2, np.pi/2)}"
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)
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