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Table 2 IBM quantum devices used in our experiments. “Date” indicates the time that we execute our codes, which can be found on Github [22]. All other column including the lifetime \(T_{1}\), decoherence time \(T_{2}\), gate errors, readout errors are recorded at the time of the experiments. Their values are averaged over all 5 qubits. Connectivity denote the layout of the chip. Most of them are designed as T shape, which mean the center qubit connects to three other qubits

From: Experimenting quantum phenomena on NISQ computers using high level quantum programming

Name Date mm/yy \(T_{1}\) (μs) \(T_{2}\) (μs) CNOT error (%) Readout error (%) Connectivity
Burlington 08/20 84.88 67.36 1.50 4.64 T
Essex 08/20 104.31 123.7 1.76 3.59 T
London 08/20 61.45 62.74 1.75 4.40 T
Ourense 08/20 93.15 66.43 0.92 2.96 T
Valencia (Fig. 2) 08/20 84.18 62.78 1.11 2.32 T
Valencia (Fig. 3) 09/20 100.00 80.49 1.10 2.52 T
Vigo (Figs. 12) 08/20 73.28 50.73 1.07 1.66 T
Vigo (Fig. 4) 09/20 107.64 74.04 0.94 1.96 T
x2 08/20 57.08 45.40 1.82 3.18 \(\raisebox{6pt}{\rotatebox{180}{\tiny${\vartriangle}$}}\hspace{-4.55pt}\raisebox{-0.5pt}{\tiny${\vartriangle}$}\)