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qojulia / QuantumOptics.jl

Library for the numerical simulation of closed as well as open quantum systems.
http://qojulia.org
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Incorrect Gaussian state #345

Open uday-sankar opened 1 year ago

uday-sankar commented 1 year ago

I wanted to create a gaussian packet of particular energy so I tried making Gaussian packets with different momenta fixing the sigma. The energy of the wavepacket increases when I increase the po_x value but after a point, the energy sharply decreases even with a higher p0_x. And one more question, is h-bar=1 in the software? i.e, all the units are in Hartree atomic units or S.I units? Further, The energy of a gaussian state depends on the resolution of the grid. My energy went from 47Kcal to 27Kcal when I changed the resolution in the x-axis from 170 to 200 points.

Lightup1 commented 1 year ago

As for the unit of $\hbar$, you can check #294. As for the energy of Gaussian packets, I think the dependance could be natural since the min or max momentum of the momentum space is dependent on the position space.

uday-sankar commented 1 year ago

Yeah, thanks for your response. Later going through some theory I understood the problem. And thank you for clarifying the hbar unit.