Calculate the probablity density and current density of a wavefunction

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The discussion focuses on calculating the probability density and current density of a wavefunction using the time evolution operator. The wavefunction is expressed as Ψ(x,t) = U(t,t1) * Ψ(x,t1), but the next steps for calculating the probability and current densities remain unclear. Participants suggest expanding the list of relevant equations to include those needed for probability calculations. The conversation emphasizes the importance of understanding these concepts in quantum mechanics. Clarifying these calculations is essential for progressing in the problem.
anchal2147
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Homework Statement
Want to find the solution of part b,c and d
Relevant Equations
time evolution operator, momentum and position operator
i have use time evolution operator to get the wavefunction at any time "t" as Ψ(x,t) = U(t,t1) * Ψ(x,t1)
but i don't know how to calculate next part of the question
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Maybe it helps to enlarge your list of "relevant equations" by the probabilities asked for in (b) and for the probability density and current density in (c)...
 
(a) The polarisation pattern is elliptical with maximum (1,1) and minimum (-1,-1), and anticlockwise in direction. (b) I know the solution is a quarter-wave plate oriented π/4, and half-wave plate at π/16, but don't understand how to reach there. I've obtained the polarisation vector (cos π/8, isin π/8) so far. I can't find much online guidance or textbook material working through this topic, so I'd appreciate any help I can get. Also, if anyone could let me know where I can get more...

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