## About

I am a researcher in quantum information theory based at the Institut für Theoretische Physik, Leibniz Universität Hannover. I am interested in quantum information theory and complex quantum systems.

Inspired by the recent discussions (see, eg., Michael Nielsen’s blog postings) surrounding open science I decided to start a weblog containing my research notes. I intend to post my notes on my various research projects along with some expository material. It is my hope that this weblog can become a forum for open discussion and research. Thus I would like to invite you to *comment*, *contribute*, and *collaborate!* If you make any progress on the ideas or open problems discussed on this site then please let me know via the comments: I am more than happy for anything here to become a joint project, the more the merrier!

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I like your blog. I am really in to math even though I am only 14 and Maybe one day I will discover new things like you are doing. :).

Hello Sir

i am a phd student working in condesed matter physics

i thank you for the sharing your lecture notes on variational principles in quantum mechanics.

they proved to be very helpful in understanding many things .

particularly they helped to get a better understanding of DMRG.

i would like to know whether renormalization procedure itself can be thought in terms of variational principle?

best regards

rukhsan

ps can i have your mail id!

Dear rukhsan,

Many thanks for your email and your interest!

To answer your question: “i would like to know whether renormalization procedure itself can be thought in terms of variational principle?”

I think the answer is not clear at the moment: some RG schemes are like variational principles, but, e.g., Wilson’s original momentum space RG is not obviously connected. So there is still work to do to find a connection…

Sincerely,

Tobias

Hello,

Are you still working on those open science projects on GitHub?

Thank you.

Dear John,

Many thanks for your question: indeed we are still working on these projects. There will be imminent changes soon as we begin to work on a final paper for each of the projects.

Sincerely,

Tobias

Dear Professor,

could it be or am i entitled to mention my impression,

that you used the words “criteria” and “momenta” as if they would be the singular form of / instead of “criterium” and “momentum” during Advanced QM YouTube Lectures seemingly preferrring the feminine form (Femininum) over the Neutrum (deutsch) allthough they are the Mehrzahl…………….?

Greetz RWitold