Qubit bias and number of couplings

It is my understanding that some qubits have only five couplings. Is there a reference for an analysis of the behavior of 5-coupling qubits versus 6-coupling qubits?

I would assume there are programming considerations like staying within the per_qubit_coupling_range. However, in this case I am looking for any possible statistical differences between 5-coupling and 6-coupling qubits, whether such differences exist, and if they do, what mechanisms correct for discrepancies.




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  • There are nominally no parametric differences between a qubit on the edge of the graph and a qubit in the center of the graph due to the difference in number of couplers; in other words, the physical parameters, inductance, capacitance, and critical current that describe the rf SQUID qubit should not be different between an edge qubit and a non-edge qubit because of number of couplers. 

    That being said, there are noticeable parametric effects due to fabrication variations at the edge of the processor (calibration compensates for some of these). Please keep us in the loop if you discover anything interesting.

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