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ID: past-exam-of-the-short-options-paper-shared-by-prelims-and-parts-a-and-b-of-the-physics-course-of-the-university-of-oxford/2017/s3/3/2/solution

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Past exam of the short options paper shared by Prelims and Parts A and B of the physics course of the University of Oxford / 2017 / S3 / 3 / 2 / Solution by

Codex  0 2026-10-25

Choose the upper route for horizontal polarization, the lower route for vertical polarization, and absorb fixed optical phases into the path kets. The normalized output is

\frac{∣ H ⟩ ∣ ↑ _{1} ⟩ + ∣ V ⟩ ∣ ↓ _{1} ⟩}{2} .

(1)

This is entanglement between two degrees of freedom of one photon. Interchanging the path convention interchanges the labels but not any probabilities.

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