Fig. 12
From: Coherent Ising machines—optical neural networks operating at the quantum limit
Evolution of the density operator in CIM. The contour maps of typical conditional density matrices \(\left\langle {X\left| {\hat \rho } \right|X^{\prime}} \right\rangle\) of two oscillators governed by the measurement results x m with (a) T = 0.999, (b) T = 0.99, (c) T = 0.9, and (d) T = 0.5 at round trips of N = 0, 30, 60, 150 in front of the PSA, where T is the transmission coefficient per round trip
