Wave-packet in configuration space

[Pradyuman]

In the book "Group theory and it's Applications to the Quantum Mechanics of atomic spectra " by Eugene P. Wigner

in chapter 4 The elements of quantum mechanics it is written

Consider a many dimensional space with as many coordinates as the system considered as position coordinates. Every arrangement of the positions of the particles of the system corresponds to a point in this multidimensional configuration space. This point will move in the course of time tracing out a curve by which the motion of the system can be completely described classically. There exists a fundamental correspondence between the classical motion of this point, the system point in configuration space, and the motion of a wave packet also considered in configuration space, if only we assume that the index of refraction for these waves is $\sqrt{2m(E-V)}\over E$, where $E$ is the total energy of the system;$V$ is the potential energy as a function in the configuration space.

What does the wave-packet and the refractive index implies here.How to interpret this?

 

[anuttarasammyak]

I do not know the index of refraction in this context. According to the formula you quote, it has physical dimension of $L^{-1}T$, inverse of velocity, if he does not apply some convention of unit that you have not quoted there.