Photonic QPU With Coherent States for Reversible Quantum Logic

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, C¯$\overline{C}$ ‐NOT, C 2$^2$ ‐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/ C¯$\overline{C}$ ‐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.

• Publication year

  2026

• Venue

  Annals of Physics

• Publication date

  2026-01-30

• Fields of study

  Not labeled

• Identifiers
  DOI 10.1002/andp.202500635
• External record

  Open on Semantic Scholar

• Source metadata

  Semantic Scholar

• No claims are published for this paper.

• No concepts are published for this paper.

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