Table 2 Results of coherence characterization and randomized-benchmarking (RB) experiments for the five unimon qubits

From: Unimon qubit

 

Φdiff = Φ0/2

Qubit

T1

\({T}_{2}^{*}\)

\({T}_{2}^{{{{{{{{\rm{e}}}}}}}}}\)

\({A}_{{{{\Phi }}}_{{{{{{{{\rm{diff}}}}}}}}}}\)

RB fidelity

Gate duration

 

(μs)

(μs)

(μs)

(μΦ0)

(%)

(ns)

A

7.2

1.9

6.8

6.1

99.81

13.3

B

8.6

3.1

9.2

15.0

99.90

13.3

C

5.8

2.3

9.3

11.2

99.54

40

D

3.9

2.3

7.0

11.1

99.63

20

E

5.6

2.5

11.4

14.3

99.86

13.3

  1. The measured energy relaxation time T1, the measured Ramsey coherence time \({T}_{2}^{*}\), the measured echo coherence time \({T}_{2}^{{{{{\rm{e}}}}}}\), the flux noise density parameter \({A}_{{{{\Phi }}}_{{{{{{{{\rm{diff}}}}}}}}}}\) at 1 Hz estimated from the echo coherence time, the average fidelity per microwave gate from standard RB experiments, and the gate duration used in the RB experiments. All of the values are measured in the immediate vicinity of the sweet spot Φdiff = Φ0/2.
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