Figure 3
From: Dynamic Concatenation of Quantum Error Correction in Integrated Quantum Computing Architecture
(a) n = 5 QFT circuit. (Initial states (|0〉) are omitted. Time progresses from left to right.) A total of six controlled-T gates and controlled-RZ gates in this circuit, which generate 10 sequences of the single-qubit gates that cannot be processed in parallel. (b) Decomposed QFT circuit. RZ(φ) \((\phi =\pm \,\frac{\pi }{8},\pm \,\frac{\pi }{16},\pm \,\frac{\pi }{32})\) will be decomposed into 250 single-qubit gates each in this circuit. Thus there are 18 sequences RZ(φ) of the single-qubit gates. However, eight of them are processed in parallel and 10 sequences affect the total processing time.
