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  • Akarsh Simha 10:42 pm on February 27, 2009 Permalink  

    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 :)
    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 >
    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
    exp( -i H (-2:03:00 + \epsilon ) / \hbar ) \hat{R} |Naveen>
    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
    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>
    exp( -i H (-2:03:00 ) ) exp ( -\alpha a\dagger + \alpha*a ) |Naveen>
    10:16 PM what will you do now
    10:17 PM me: Oh no.
    I shall delocalize myself by squeezing myself in the p quadrature
    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
    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
    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>

  • Akarsh Simha 6:43 pm on February 1, 2009 Permalink  

    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 🙂

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