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There is no "first" quantization

H. D. Zeh
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Abstract

The introduction of spinor and other massive fields by ``quantizing'' particles (corpuscles) is conceptually misleading. Only spatial fields must be postulated to form the fundamental objects to be quantized (that is, to define a formal basis for all quantum states), while apparent ``particles'' are a mere consequence of decoherence. This conclusion is also supported by the nature of gauge fields.

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H. D. Zeh. 2003-03-30. There is no "first" quantization. https://doi.org/10.1016/s0375-9601(03)00209-3

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