Equation 5 · A Reference Frame Becomes Classical by Publishing Its Orientation
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Symbol J_z
is a part of this expression. Its role is fixed by the surrounding article and by the operations shown in the formula.
subscript
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A laboratory description often begins with an unmentioned gift: an external frame. A Hamiltonian contains ; a detector sits at angle ; a photon is called horizontally polarized. Those symbols presuppose an axis relative to which “z,” “angle,” and “horizontal” have meaning. Quantum-reference-frame research asks what happens when the object providing that axis is finite and quantum.
Sources cited in the article section
- [2] Reference Frames, Superselection Rules, and Quantum Information ↗
- [4] Degradation of a Quantum Reference Frame ↗
- [3] Dynamics of a Quantum Reference Frame ↗
- [7] The Resource Theory of Quantum Reference Frames: Manipulations and Monotones ↗
- [8] Extending Noether's Theorem by Quantifying the Asymmetry of Quantum States ↗
These citations give research context. Read each source to check which claims it supports.
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