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Figure 2 | EPJ Quantum Technology

Figure 2

From: Characterization of how dissipation and dephasing errors accumulate in quantum computers

Figure 2

The Toffoli gate: (a) The three-qubit Toffoli gate on the left may be reproduced by a circuit of C-NOT, Hadamard (H), and gates, shown to the right. (b) The process matrix χ (left), characterizing the Toffoli gate may be calculated by concatenation of one- and two-qubit process matrices (right). The process matrices , , and characterize the C-NOT, Hadamard, T and gates respectively. The ‘identity’ process matrix indicates an idle qubit.

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