Table 2 Correlated charge jump rates in qubit pairs

From: Measurement of correlated charge noise in superconducting qubits at an underground facility

 

Q1-Q2

Q3-Q4

Q1-Q3

Q1-Q4

Q2-Q3

Q2-Q4

Units

Separation

640

340

3195

3330

3180

3240

μm

Shield open

\({{{\rm{0}}}}.2{7}_{-0.07}^{+0.09}\)

\({{{\rm{0}}}}.2{9}_{-0.07}^{+0.09}\)

\({{{\rm{0}}}}.0{3}_{-0.02}^{+0.04}\)

\({{{\rm{0}}}}.0{8}_{-0.04}^{+0.06}\)

\({{{\rm{0}}}}.0{5}_{-0.03}^{+0.05}\)

\({{{\rm{0}}}}.0{8}_{-0.04}^{+0.06}\)

mHz

Shield closed

\({{{\rm{0}}}}.1{0}_{-0.04}^{+0.07}\)

\({{{\rm{0}}}}.0{4}_{-0.03}^{+0.05}\)

< 0.03

< 0.04

< 0.03

< 0.04

mHz

  1. Efficiency-corrected rates (mHz) with magnitude 0.1e≤∣Δq∣≤0.5e in each qubit pair. Statistical errors are provided; systematic errors are an order of magnitude smaller. The separation distances of each qubit pair are provided for reference (see Fig. 2). We measure zero correlated charge jumps for qubits separated by over 3 mm, over 22 h of continuous data taking.
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