Extended Data Fig. 2: Reconstructed density matrices transferred through Thot = 4 K.
From: A thermal-noise-resilient microwave quantum network up to 4 K
a-d, These density matrices are measured on QB used to reconstruct the process matrix χ with the initial states \(| 0\rangle\), \(| 0\rangle -i| 1\rangle\), \(| 0\rangle +| 1\rangle\), \(| 1\rangle\) prepared on QA. The left and right parts are real and imaginary components of the density matrix in each panel. The corresponding fidelities (\({{\mathcal{F}}}_{\rho }\)) are presented for cases without (purple bars) and with (orange frames) SPAM error correction.
