Hamiltonian Commutator: Finding [H,P_x] for Polarization Operator

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SUMMARY

The discussion focuses on calculating the Hamiltonian commutator [H, P_x] where H is defined as H = -(\hbar^2 / 2m)(∂²/∂x²) + V(x) and P_x is the polarization operator given by P_x = 2Re[c_+^*c_-]. Participants emphasize the need to apply the commutation relations similarly to how one would for position operators, suggesting a direct substitution of P_x in place of x during the computation process.

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Homework Statement



How do I obtain [H,P_x]? P_x is the polarization operator.


Homework Equations



[tex]H=-\frac{\hbar^2}{2m}\frac{\partial^2 }{\partial x^2}+V(x)[/tex]

[tex]P_x=2Re[c_+^*c_-][/tex]


The Attempt at a Solution



I know how to commute H and x. But somehow can't think of a way to do the same for H and P_x.
 
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write P_x instead of x; then do the commutation just as you do for x
 

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