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Most of the methods that I have seen in various papers all take single examples and then proceed to manually perform swapping by re-writing the states on a different basis and then performing a measurement to swap entanglement.

Examples: https://chem.libretexts.org/Bookshelves/Physical_and_Theoretical_Chemistry_Textbook_Maps/Supplemental_Modules_(Physical_and_Theoretical_Chemistry)/Quantum_Tutorials_(Rioux)/Quantum_Teleportation/357%3A_An_Entanglement_Swapping_Protocol

Or entanglement is spoken about very briefly, such as in: Horodecki, R., Horodecki, P., Horodecki, M., & Horodecki, K. (2009). Quantum entanglement. Reviews of Modern Physics, 81(2), 865–942. - Page 12

I wish to code entanglement swapping for some arbitrary state of 4 qubits, of which A-B and C-D are entangled. I wish to perform the swapping leaving A-D entangled. How would I go about doing the same? I was unable to find any detailed resources on swapping or a generalized entanglement swapping procedure anywhere.

narip
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2Shabby
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I think what you want is in this paper : Fusion-based quantum computation

Look at the "Bell fusion" in Fig 2. Basically you measure $X_BX_C$ and $Z_B Z_C$ and that leaves $q_A q_D$ entangled.

unknown
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