Figure 1

Outline of the detection scheme showing the input field mode $a$ prepared in a coherent state $\mid \alpha ⟩$ experiencing a nonlinear unitary transformation encoding the signal $\varphi$ in the transformed state $\mid \psi ⟩$. The beam splitter BS1 describes the effect of nonunit detection efficiencies so that the real scheme performs the homodyne measurement of the quadrature $\tilde{X}$ of the mode $\tilde{a}$ leaving BS1 by mixing the signal beam with a strong local oscillator at beam splitter BS2.Reuse & Permissions