Photonic <i>QPU</i> With Coherent States for Reversible Quantum Logic

ABSTRACT We present a versatile photonic Quantum Processing Unit (QPU) design that employs coherent state qubits and linear‐optics devices to probabilistically implement a range of fundamental logical functions—including AND , OR , C ‐NOT, ‐NOT, C ‐NOT (Toffoli), and C ‐SWAP (Fredkin). Our approach achieves success probabilities that can reach up to 1/4 for simpler gates such as C ‐NOT/‐NOT, and OR/AND , while more complex gates exhibit lower, yet still viable, efficiencies. Numerical simulations yielded an average output state fidelity of over 95%. These results indicate that the proposed architecture offers a promising pathway toward scalable quantum information processing.