- #1
McLaren Rulez
- 292
- 3
Hi,
Could someone explain how the following two definitions of the displacement operator are equal? The first is the standard one
1) [itex]e^{\alpha a^{\dagger}-\alpha*a}[/itex]
But what about this one? This is from a Fock state decomposition of a coherent state.
2) [itex]e^{\frac{-|\alpha^{2}|}{2}}e^{\alpha a^{\dagger}}[/itex]
What is the reasoning behind not using the second equation to define the operator that acts on a vacuum state to produce a coherent state? Or if it is fine to use definition 2), then can someone help me show that the two definitions are equivalent?
Thank you
Could someone explain how the following two definitions of the displacement operator are equal? The first is the standard one
1) [itex]e^{\alpha a^{\dagger}-\alpha*a}[/itex]
But what about this one? This is from a Fock state decomposition of a coherent state.
2) [itex]e^{\frac{-|\alpha^{2}|}{2}}e^{\alpha a^{\dagger}}[/itex]
What is the reasoning behind not using the second equation to define the operator that acts on a vacuum state to produce a coherent state? Or if it is fine to use definition 2), then can someone help me show that the two definitions are equivalent?
Thank you