## Pseudo-Quantum Mechanical description of Birthday wishes

This is what 3 years of Physics can do to you:

 9:56 PM Naveen: why the deja vu suddenly? me: What is the deja vu? Torus and 16D compact manifold? Naveen: yeah remembering something that had happened in the past 9:57 PM actually it is slightly different 9:58 PM but sounds pseud all the same, so used it :) me: Ah, okay I understand. Nothing, generally Naveen: oh :) ok me: exp( -i H (-2:03:00) / \hbar ) | Happy Birthday > 9:59 PM Naveen: :D exp( -i H (-2:04:00) / \hbar ) | Thank You > 10:01 PM me: \hat{B} | Naveen > Oops 10:02 PM exp( -i H (-2:03:00 ) / \hbar ) \hat{B} |Naveen> Where \hat{B} is the bumping operator Naveen: he he :D 10:03 PM exp( -i H (-2:03:00 ) / \hbar ) \hat{R} |Naveen> where \hat{R} is the run operator ooops exp( -i H (-2:03:00 + \epsilon ) / \hbar ) \hat{R} |Naveen> aiyyo, exp( -i H (-2:03:00 - \epsilon ) / \hbar ) \hat{R} |Naveen> 10:07 PM me: exp( -i H (-2:00:00 ) ) exp ( \alpha a\dagger - \alpha*a ) |Akarsh> 10:08 PM Where \alpha is chosen so that my probability distribution shifts right in front of where you will be standing after the time delay [BTW, the time is decreasing because the time to 12:00 midnight is decreasing] [You should use that appropriately, at least to some approximation] 10:12 PM me: BTW the exp ( \alpha... ) stuff is called the Displacement operator And it is the operator that performs phase space translations Naveen: ah... nice 10:13 PM me: /me enjoys the power of quantum operators that can teleport him |Akarsh>|Naveen> Now I've switched to the interaction basis. I shall soon apply the bumping operator 10:14 PM Naveen: let us see 10:15 PM exp( -i H (-2:03:00 ) ) exp ( -\alpha a\dagger + \alpha*a ) |Akarsh> oops exp( -i H (-2:03:00 ) ) exp ( -\alpha a\dagger + \alpha*a ) |Naveen> 10:16 PM what will you do now and 10:17 PM me: Oh no. I shall delocalize myself by squeezing myself in the p quadrature S|Akarsh> 10:18 PM Where S is the squeezing operator, chosen so that it makes \Delta p very small Naveen: |lightcone> = exp( -i H (00:00:28 ) ) exp ( -2\alpha a\dagger + 2\alpha*a ) |kstar> me: Now wherever you run, you can't escape. [Please add appropriate time evolution operators] Naveen: |lightcone> = exp( -i H (00:00:28 ) ) exp ( -2\alpha a\dagger + 2\alpha*a ) |kstar> 10:19 PM me: Look - I'm delocalized now. That won't save you 10:20 PM Naveen: S^{-1} |lightcone> = exp( -i H (00:00:28 ) ) exp ( -2\alpha a\dagger + 2\alpha*a ) |kstar> 10:21 PM what do you say for that? me: Wait, how does that help? 10:22 PM Ah... ok, you're delocalizing yourself as well Naveen: yeah :P me: But that won't help, because I can still interact with you Naveen: but not effectively me: Both of us are delocalized, so there's a LOT of overlap Doesn't matter Enough for me to apply bumping operator Naveen: no effective overlap PS|kstar> 10:23 PM me: ^^ What are PS? 10:24 PM Naveen: P_{z}S^{-1}|lightcone> where P is the projection on the x-y plane and P_{z} is the projection on the z axis 10:25 PM then you will be smeared on the x-y plane and I will be stretched on to the z-axis and there will be only one point of overlap and you cant fit your foot(that too delocalized :P) into a point 10:26 PM me: Hmm Look, you don't have rights to operate on my wavefunction It's mine. I choose to do what I want with my state. 10:27 PM You have right over your state. If you want to collapse onto the X-Y plane, you're welcome to do that - but you shouldn't be doing that to me. You can at most produce a field which would force me to apply a certain operator on my state 10:28 PM Naveen: basically, I didnt say anything about the time evolution operators me: Eh? Naveen: I will do that when we interact then I will have some effect on you 10:29 PM remember that \epsilon ? that is why that was there so that I can have some control over your wavefunction me: Hmm, I don't understand. Okay, let me withdraw from the game 10:30 PM Naveen: ok... me: a|kstar> 

• #### lightcone 10:59 pm on February 27, 2009 Permalink | Log in to Reply

Atleast one doesn’t end up on a chaotic trajectory after three years in EE EP. 😛 Physics is fun 🙂

• #### C Pro 11:01 pm on February 27, 2009 Permalink | Log in to Reply

Enna Koduma Akarsh idhu..:P..

• #### Chiquita 8:22 pm on March 3, 2009 Permalink | Log in to Reply

First blog I read after wakeup from sleep today!

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Are you tension? panic?

## flickrfs trouble – and fixes

I was rather frustrated that flickrfs was not working when I most wanted it.

While the Debian version worked fine at home, it was not working from IITM’s network, so I decided to try the CVS version.

I followed the steps outlined by Manish here to obtain the CVS version. The filesystem got mounted but there was not /sets directory, as reported here. I applied the suggested patch and it seemed to work.

Even the latest release did not work, even with the above mentioned patch. It gave the following error:

 02/01/09 17:35:16 ERROR Exception in function <bound method Flickrfs.__sync_set_in_background of > 02/01/09 17:35:16 ERROR Traceback (most recent call last): File "flickrfs.py", line 100, in _log_exception_wrapper func(*args, **kw) File "flickrfs.py", line 314, in __sync_set_in_background psetOnline = self.transfl.getPhotosFromPhotoset(set_id) File "/home/akarsh/devel/flickrfs-1.3.9/transactions.py", line 357, in getPhotosFromPhotoset for p in rsp.photoset[0].photo: AttributeError: XMLNode instance has no attribute 'photo' 

Hope this helps 🙂

c
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