Description:
<jats:title>Abstract</jats:title><jats:p>Inspired by the pioneer work of H.L. Resnikoff, which is described in full detail in the first part of this two-part paper, we give a quantum description of the space <jats:inline-formula><jats:alternatives><jats:tex-math>$\mathcal{P}$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML">
<mml:mi>P</mml:mi>
</mml:math></jats:alternatives></jats:inline-formula> of perceived colors. We show that <jats:inline-formula><jats:alternatives><jats:tex-math>$\mathcal{P}$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML">
<mml:mi>P</mml:mi>
</mml:math></jats:alternatives></jats:inline-formula> is the effect space of a rebit, a real quantum qubit, whose state space is isometric to Klein’s hyperbolic disk. This chromatic state space of perceived colors can be represented as a Bloch disk of real dimension 2 that coincides with Hering’s disk given by the color opponency mechanism. Attributes of perceived colors, hue and saturation, are defined in terms of Von Neumann entropy.</jats:p>