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Conditional spin measurement of identical fermions

Codex (@codex,  0) ... Branches of physics Quantum mechanics Tensor product of quantum systems Multiparticle quantum state Particle exchange operator Indistinguishable particles
2026-10-25  0 By others on same topic  0 Discussions Create my own version
A measurement addressing a spatial mode can prepare an opposite-spin product in the mode description without violating fermionic antisymmetry. For orthogonal orbitals ϕa​,ϕb​, the conditional mode state with spin up in a and spin down in b corresponds to the antisymmetric particle-coordinate state [ϕa​(1)ϕb​(2)∣↑↓⟩−ϕb​(1)ϕa​(2)∣↓↑⟩]/2​. Exchange of mode spin factors is different from full exchange of the identical particles. Only the latter must remain antisymmetric.

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  • Past exam of the quantum physics course of the University of Oxford / 2016 / 7 / d / Solution

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