Extended Data Table 1 Qubit parameters, lifetime and coherence times for 45 Ta-on-Si qubits across nine chips

From: Millisecond lifetimes and coherence times in 2D transmon qubits

Qubit

Gap (μm)

Deposition vacuum

Frequency (GHz)

\({{\boldsymbol{T}}}_{{\bf{1}}}^{{\bf{avg}}}\) (μs)

\({{\boldsymbol{T}}}_{{\bf{1}}}^{{\bf{\max }}}\) (μs)

Qavg (×106)

Qmax (×106)

\({{\boldsymbol{T}}}_{{\bf{2}}{\bf{E}}}^{{\bf{avg}}}\) (μs)

\({{\boldsymbol{T}}}_{{\bf{2}}{\bf{E}}}^{{\bf{\max }}}\) (μs)

1

70

HV

2.985

610.4 ± 212.2

1,030.9 ± 34.1

11.4 ± 4.0

19.3 ± 0.6

297.5 ± 49.1

492.8 ± 122.4

2

70

HV

3.408

423.5 ± 143.3

762.6 ± 17.5

9.1 ± 3.1

16.3 ± 0.4

164.7 ± 21.2

228.4 ± 15.3

3

70

HV

3.398

579.8 ± 136.9

875.9 ± 49.4

12.4 ± 2.9

18.7 ± 1.1

128.6 ± 17.3

155.7 ± 5.0

4

70

HV

3.371

359.1 ± 50.3

464.6 ± 9.9

7.6 ± 1.1

9.8 ± 0.2

109.1 ± 12.4

141.6 ± 4.9

5

70

HV

3.791

375.9 ± 109.1

633.4 ± 48.2

9.0 ± 2.6

15.1 ± 1.2

57.6 ± 3.8

67.8 ± 5.9

6

70

HV

3.122

441.4 ± 177.0

717.9 ± 36.7

8.7 ± 3.5

14.1 ± 0.7

–

–

7

70

HV

3.108

570.1 ± 137.2

875.5 ± 18.2

11.1 ± 2.7

17.1 ± 0.4

188.4 ± 56.3

351.8 ± 50.2

8

70

HV

3.437

343.8 ± 107.0

534.5 ± 13.7

7.4 ± 2.3

11.5 ± 0.3

–

–

9

70

HV

3.823

450.7 ± 111.1

700.6 ± 26.6

10.8 ± 2.7

16.8 ± 0.6

–

–

10

70

HV

3.436

522.5 ± 91.0

710.6 ± 47.8

11.3 ± 2.0

15.3 ± 1.0

–

–

11

70

HV

3.702

287.7 ± 96.5

518.1 ± 41.3

6.7 ± 2.2

12.1 ± 1.0

–

–

12

70

HV

3.776

343.2 ± 145.3

749.9 ± 33.8

8.1 ± 3.4

17.8 ± 0.8

–

–

13

70

HV

3.947

588.5 ± 78.2

799.9 ± 45.5

14.6 ± 1.9

19.8 ± 1.1

–

–

14

70

HV

4.059

253.4 ± 60.1

403.1 ± 43.0

6.5 ± 1.5

10.3 ± 1.1

–

–

15

70

HV

4.413

321.8 ± 90.8

603.7 ± 38.7

8.9 ± 2.5

16.7 ± 1.1

–

–

16

70

HV

3.010

794.2 ± 197.2

1,265.6 ± 34.5

15.0 ± 3.7

23.9 ± 0.7

331.2 ± 54.9

491.8 ± 37.7

17

100

HV

3.316

521.9 ± 192.1

1,015.5 ± 39.1

10.9 ± 4.0

21.2 ± 0.8

695.2 ± 202.3

1,184.5 ± 98.2

18

100

HV

3.391

623.1 ± 204.5

1,071.4 ± 23.1

13.3 ± 4.4

22.8 ± 0.5

–

–

19

80

HV

3.701

417.3 ± 168.2

833.5 ± 30.1

9.7 ± 3.9

19.4 ± 0.7

–

–

20

70

HV

4.020

396.7 ± 109.2

606.8 ± 11.7

10.0 ± 2.8

15.3 ± 0.3

–

–

21

70

HV

3.863

481.7 ± 131.3

730.8 ± 24.3

11.7 ± 3.2

17.7 ± 0.6

–

–

22

70

HV

4.255

375.1 ± 87.8

538.0 ± 10.5

10.0 ± 2.3

14.4 ± 0.3

–

–

23

70

HV

4.965

240.7 ± 75.8

415.7 ± 13.8

7.51 ± 2.4

13.0 ± 0.4

–

–

24

70

HV

2.943

533.5 ± 139.2

854.8 ± 55.2

9.9 ± 2.6

15.8 ± 1.0

–

–

25

70

HV

3.312

382.8 ± 127.0

703.4 ± 61.2

8.0 ± 2.6

14.6 ± 1.3

–

–

26

70

HV

3.192

387.3 ± 121.9

715.5 ± 75.0

7.8 ± 2.4

14.3 ± 1.5

–

–

27

70

HV

3.656

241.3 ± 25.7

306.7 ± 13.3

5.5 ± 0.6

7.0 ± 0.3

–

–

28

70

HV

3.660

421.6 ± 88.7

621.9 ± 44.7

9.7 ± 2.0

14.3 ± 1.0

–

–

29

70

HV

3.496

363.3 ± 79.0

553.5 ± 65.5

8.0 ± 1.7

12.2 ± 1.4

–

–

30

70

UHV

2.741

646.7 ± 157.3

1,234.8 ± 133.6

11.1 ± 2.7

21.3 ± 2.3

–

–

31

70

UHV

3.204

516.1 ± 222.2

1,013.3 ± 47.0

10.4 ± 4.5

20.4 ± 1.0

416.6 ± 114.7

635.3 ± 52.0

32

70

UHV

3.571

489.1 ± 109.5

946.3 ± 90.8

11.0 ± 2.5

21.2 ± 2.0

446.3 ± 57.3

601.7 ± 52.4

33

70

UHV

3.908

397.9 ± 79.0

654.0 ± 21.3

9.8 ± 1.9

16.1 ± 0.5

269.1 ± 44.5

393.4 ± 29.9

34

70

UHV

2.407

1,003.0 ± 233.1

1,681.8 ± 100.9

15.2 ± 3.5

25.4 ± 1.5

–

–

35

70

UHV

2.741

464.4 ± 112.3

859.9 ± 109.6

8.0 ± 1.9

14.8 ± 1.9

–

–

36

70

UHV

3.109

511.6 ± 60.6

735.3 ± 60.3

10.0 ± 1.2

14.4 ± 1.2

673.2 ± 128.9

1,058.2 ± 82.0

37

70

UHV

3.440

278.8 ± 76.9

451.7 ± 30.5

6.0 ± 1.7

9.8 ± 0.1

–

–

38

70

UHV

3.451

481.4 ± 115.0

728.5 ± 62.0

10.4 ± 2.5

15.8 ± 1.3

–

–

39

70

UHV

3.829

378.3 ± 95.0

650.8 ± 125.6

9.1 ± 2.3

15.7 ± 3.0

744.3 ± 108.4

955.2 ± 63.0

40

70

UHV

3.074

520.0 ± 123.5

831.6 ± 82.7

10.0 ± 2.4

16.1 ± 1.6

686.3 ± 139.5

1,048.9 ± 93.2

41

70

UHV

3.227

538.7 ± 80.7

772.3 ± 41.1

10.9 ± 1.6

15.7 ± 0.1

647.9 ± 111.1

939.9 ± 126.4

42

70

UHV

3.418

500.6 ± 100.7

752.1 ± 38.9

10.8 ± 2.2

16.2 ± 0.1

676.5 ± 113.8

953.1 ± 91.9

43

70

UHV

3.381

415.8 ± 132.7

750.7 ± 82.3

8.8 ± 2.8

15.9 ± 1.8

354.4 ± 97.0

579.6 ± 54.3

44

70

UHV

3.634

371.2 ± 69.5

609.4 ± 31.9

8.5 ± 1.6

13.9 ± 0.1

569.9 ± 107.3

795.1 ± 59.2

45

70

UHV

3.831

324.9 ± 54.8

471.6 ± 38.9

7.8 ± 1.3

11.4 ± 0.1

537.3 ± 80.1

773.8 ± 84.6

  1. T2E was only measured on a subset of devices because we were rapidly iterating on most chips to improve T1. The reported uncertainties for average values are s.d. of measured values over time and the uncertainties in maximum values are s.d. of the fit.
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