diff --git a/quantum/quantum_teleportation.py b/quantum/quantum_teleportation.py new file mode 100644 index 000000000..5fbc57a66 --- /dev/null +++ b/quantum/quantum_teleportation.py @@ -0,0 +1,70 @@ +#!/usr/bin/env python3 +""" +Build quantum teleportation circuit using three quantum bits +and 1 classical bit. The main idea is to send one qubit from +Alice to Bob using the entanglement properties. This experiment +run in IBM Q simulator with 1000 shots. +. +References: +https://en.wikipedia.org/wiki/Quantum_teleportation +https://qiskit.org/textbook/ch-algorithms/teleportation.html +""" + +import numpy as np +import qiskit +from qiskit import Aer, ClassicalRegister, QuantumCircuit, QuantumRegister, execute + + +def quantum_teleportation( + theta: float = np.pi / 2, phi: float = np.pi / 2, lam: float = np.pi / 2 +) -> qiskit.result.counts.Counts: + + """ + # >>> quantum_teleportation() + #{'00': 500, '11': 500} # ideally + # ┌─────────────────┐ ┌───┐ + #qr_0: ┤ U(π/2,π/2,π/2) ├───────■──┤ H ├─■───────── + # └──────┬───┬──────┘ ┌─┴─┐└───┘ │ + #qr_1: ───────┤ H ├─────────■──┤ X ├──────┼───■───── + # └───┘ ┌─┴─┐└───┘ │ ┌─┴─┐┌─┐ + #qr_2: ───────────────────┤ X ├───────────■─┤ X ├┤M├ + # └───┘ └───┘└╥┘ + #cr: 1/═══════════════════════════════════════════╩═ + Args: + theta (float): Single qubit rotation U Gate theta parameter. Default to np.pi/2 + phi (float): Single qubit rotation U Gate phi parameter. Default to np.pi/2 + lam (float): Single qubit rotation U Gate lam parameter. Default to np.pi/2 + Returns: + qiskit.result.counts.Counts: Teleported qubit counts. + """ + + qr = QuantumRegister(3, "qr") # Define the number of quantum bits + cr = ClassicalRegister(1, "cr") # Define the number of classical bits + + quantum_circuit = QuantumCircuit(qr, cr) # Define the quantum circuit. + + # Build the circuit + quantum_circuit.u(theta, phi, lam, 0) # Quantum State to teleport + quantum_circuit.h(1) # add hadamard gate + quantum_circuit.cx( + 1, 2 + ) # add control gate with qubit 1 as control and 2 as target. + quantum_circuit.cx(0, 1) + quantum_circuit.h(0) + quantum_circuit.cz(0, 2) # add control z gate. + quantum_circuit.cx(1, 2) + + quantum_circuit.measure([2], [0]) # measure the qubit. + + # Simulate the circuit using qasm simulator + backend = Aer.get_backend("qasm_simulator") + job = execute(quantum_circuit, backend, shots=1000) + + return job.result().get_counts(quantum_circuit) + + +if __name__ == "__main__": + print( + "Total count for teleported state is: " + f"{quantum_teleportation(np.pi/2, np.pi/2, np.pi/2)}" + )