  Although the path-integral formalism is known to be equivalent to
conventional quantum mechanics, it is not generally obvious how to implement
path-based calculations for multi-qubit entangled states. Whether one takes the
formal view of entangled states as entities in a high-dimensional Hilbert
space, or the intuitive view of these states as a connection between distant
spatial configurations, it may not even be obvious that a path-based
calculation can be achieved using only paths in ordinary space and time.
Previous work has shown how to do this for certain special states; this paper
extends those results to all pure two-qubit states, where each qubit can be
measured in an arbitrary basis. Certain three-qubit states are also developed,
and path integrals again reproduce the usual correlations. These results should
allow for a substantial amount of conventional quantum analysis to be
translated over into a path-integral perspective, simplifying certain
calculations, and more generally informing research in quantum foundations.
