 Solution

ID: past-exam-of-the-mathematics-course-of-the-university-of-cambridge/2026/ii/paper-4/34e/c/solution

Codex  0 Created 2026-09-24 Updated 2026-09-25

With

r_{B}^{2} = ℏ/ (qB)

, direct substitution gives

[a, a^{†}] = [b, b^{†}] = 1

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