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        "quote": "我们还可以从另一个角度考察具有 $\\mathcal{H}=\\mathbf{C}^2$ 的二态系统与球面几何之间的关系。物理学家把这种态的几何描述称为[<u class=\"concept-term\" data-concept-reference=\"concepts/quantum-mechanics/bloch-sphere\" data-concept-identity=\"urn:uuid:3f43164d-2e69-4cc9-98b5-60fdc5e6f434\" data-concept-route=\"/concept-identities#concept-3f43164d-2e69-4cc9-98b5-60fdc5e6f434\" id=\"first-8c3f0eb4496516550659-zh\">布洛赫球(Bloch sphere)</u>](../../../../../concepts/quantum-mechanics/bloch-sphere.md)描述。具体而言，可将单位球面 $S^2\\subset\\mathbf{R}^3$ 映到如下算符：",
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