Current Times Flux Is an Energy Budget - Superconducting Qubits: LC Energy, Toy Josephson Coupling, and Readout Step by Step

This toy superconducting-qubit ledger treats current times flux as an energy budget so the units and arithmetic stay visible. The result is exact only for the stated current, flux, and coupling factor; real Josephson devices require nonlinear junction physics, calibration, noise, fabrication spread, and loss modeling.

The toy coupling surface is an exact current-flux energy ledger. Exact arithmetic here means exact results for the stated model inputs; measured inputs still carry uncertainty and significant-figure limits.

highlighted = computed this step

Current times flux has energy units

A current of 3 amperes and flux 2 webers give toy coupling energy 6 joules.

3\ \text{A}\cdot 2\ \text{Wb}=6\ \text{J}

The coupling is a normalized training contract

The checked value 6 joules is not a real device formula; it is only the toy current-flux budget.

E_{\text{toy}}=6\ \text{J}