Declared opposite response and relaxation

Fix, before collecting data,

These are known calibration inputs, not parameters estimated by the main inference map.

Let

The declared local response is

The antiqubit designation means precisely the inverse factor ${V_{\varphi }}^{†}$ in this equation. It is a linear unitary on an ordinary two-dimensional Hilbert space. No antiunitary transformation, unknown-unitary inversion algorithm, or reversal of physical time is asserted.

We include the fixed entangling gate

The inverse-response claim concerns the two local factors of $W_{\varphi }$, not inversion of the complete interacting channel.

Put $h=1-\gamma$, and define

The one-step channel is

The coherent rotation is a two-zone mixing analog. The map $L_1$ transfers the antiqubit basis value $1$ to $0$. Because these basis values encode zones, this is a declared relaxation surrogate. It is not simultaneously an independently encoded energy-loss process. No vacuum, positronium spin, photon, or physical annihilation sector has been installed.