I'm just curious. Say I have 3 qubits on a straight line 0-1-2. How do you guys (on the IBMQ or Rigetti team for example, or anyone who actually works on quantum computer) entangle 0-2 if I, say, am busy on the 1 qubit already (maybe I already have a CNOT between 0-1)? Is there a circuit for it, or is it purely hardware technique with no circuit equivalent? Say if I have:
2-1-0-3 | | 4-5
would it be better to CNOT 0 with 2, or 0 with 5, given that they have the same distance? Thank you!