Static zz coupling
zz_coupling node
This node examines the static zz coupling betweeen two coupled qubits, q1 and q2 coupled via the coupler q1_q2, which is biased at some DC current.
We label q1 as "active" qubit and q2 as "spectator" qubit. The measurement consits of performing a Ramsesy fringes measurement on the active qubit twice:
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when the spectator qubit is at \(|0\rangle\) extracting the frequency \(f_{01|spectator\ at\ 0}\).
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when the spectator qubit is at \(|1\rangle\) extracting the frequency \(f_{01|spectator\ at\ 1}\).
the ZZ coupling is calculated as \(\zeta = f_{01|spectator\ at\ 0} - f_{01|spectator\ at\ 1}\).
