## Monday, April 25, 2016

## Friday, April 15, 2016

### arXiv week + extra

__arXiv week__- Mid- and far-field deviations from causality in spontaneous light emission by atomic Hydrogen
- Master equation for collective spontaneous emission with quantized atomic motion
- Ruschhaupt: Time of arrival in "Time in QM"
- Quantum statistical gravity: time dilation due to local information in many-body quantum systems

**:**

__Assigned__Non-Equilibrium Thermodynamics of HarmonicallyTrapped Bosons

-> Loschmidt Echo

Present on optical lattice (+ Spatz article) and eventuaally on spontaneous emission

**"Returned"**Digital quantum simulation of many-body non-Markovian dynamics

__Topics__**Stat./Thermo Q. / time of arrival via spontaneous decay (Ruschhaupt) / dissipative process / emergence of "relativistic" properties**

Time operator, Zhi-Yong Wang

- http://arxiv.org/abs/quant-ph/0211047
- http://arxiv.org/abs/quant-ph/0609211
- http://arxiv.org/abs/quant-ph/0701116

Extras:

Squeezed light

http://physics.wm.edu/~inovikova/psrsqueezing.html

Remarks concerning the status and some ramifications of EHRENFEST’S THEOREM

permalink: 4/15/2016 0 comments

Labels: physics

## Friday, June 5, 2015

### Ultracold atoms in optical lattices

Ultracold fermions in a honeycomb optical lattice: http://www.quantumlah.org/media/thesis/NCQT_LeeKeanLoon_PhDthesis.pdf

Identifying topological edge states in 2D optical lattices using light scattering: http://arxiv.org/abs/1209.2051

permalink: 6/05/2015 0 comments

Labels: physics

## Tuesday, March 31, 2015

### My Favourite things (in no particular order)

Condensed Matter Physics and the Nature of Spacetime: http://ls.poly.edu/~jbain/papers/ConPhysST.pdf

QURELSIM (Quantum Simulations of Relativistic Systems): http://cordis.europa.eu/result/rcn/57448_en.html

A relativistic optical-data model for inelastic scattering of electrons and positrons in condensed matter: http://www.researchgate.net/publication/223779547_A_relativistic_optical-data_model_for_inelastic_scattering_of_electrons_and_positrons_in_condensed_matter

Gauge Dynamics and Topological Insulators: http://www.damtp.cam.ac.uk/user/tong/talks/gtop.pdf

Massless and Massive Electrons: Relativistic Physics in Condensed Matter Systems: http://www.phys.virginia.edu/Announcements/Seminars/Slides/S2758.pdf

Dirac Equation For Cold Atoms In Artificial Curved Spacetimes:

Dirac Fermions in Solids — from High Tc cuprates and Graphene to Topological Insulators and Weyl Semimetals.: http://arxiv.org/abs/1306.2272v1

Relativistic quantum effects of Dirac particles simulated by ultracold atoms: http://arxiv.org/abs/1203.5949v1

Relativistic dynamics and Dirac particles in graphene (Nan Gu's PhD thesis, 2011)

Spontaneous Symmetry Breaking and Nambu–Goldstone Bosons in Quantum Many-Body Systems: http://arxiv.org/abs/1001.5212

Fundamental quantum optics experiments conceivable with satellites reaching relativistic distances and velocities: http://arxiv.org/abs/1206.4949

Tale top particle physics with graphene:

Lectures on holographic methods for condensed matter physics: http://arxiv.org/abs/0903.3246

Holographic interaction effects on transport in Dirac semimetals: http://arxiv.org/abs/1403.3608

Spin-liquid phase and order-by-disorder of classical Heisenberg spins on the swedenborgite lattice: http://arxiv.org/pdf/1404.1787v1.pdf

permalink: 3/31/2015 0 comments

Labels: physics

## Sunday, February 8, 2015

###
Broadcom BCM4313 802.11bgn *WPA2* on Linux (Ubuntu 14.01 LTS)

Open source beats proprietary software, that's what's happening now. Ubuntu thinks to make a favour to their users by blacklisting the FLOSS `b43` driver and installing Broadcomm's `wl`, perhaps believing that things might work more smoothly. Well, that's not true: for example *WPA2 doesn't work*.

This is what I did to make it work.

I basically deleted (or moved somewhere else) the blacklist file `/etc/modprobe.d/blacklist-bcm43.conf`.

Then I uninstalled the Broadcomm dritver:

`apt-get purge bcmwl-kernel-source`

I also commented out the relevant line in `/etc/udev/rules.d/70-persistent-net.rules`.

Okay, *maybe* you still need the proprietary firmware, `b43-fwcutter` or something like that, but it's at least good news that now everything works fine (after just a reboot) and I can use *any* modern Wi-Fi network.

I'm not sure *all* of the above is necessary. Certainly `b43` works better than `wl`, as far as I can tell. Certainly Ubuntu does a great effort in tweaking GNU/Linux to give their users a better experience, but sometimes it's more of a problem than a solution. Perhaps it's just time to relax: the regular Linux drivers (the ones that the kernel or *udev* would automatically load by default), well, they... just work.

*Note*: in case you wonder:

# lspci -n

`02:00.0 0280: 14e4:4727 (rev 01)`

permalink: 2/08/2015 0 comments

Labels: sys

## Sunday, March 23, 2014

### Stop copy-pasting!

`ssh user@machine sh -c 'cat >> ~/.ssh/authorized_keys' < ~/.ssh/id_rsa.pub`

permalink: 3/23/2014 0 comments

Labels: shells & terminals

### When you SSH into Linux from Windows/MSYS

Add the following to your `.profile`

(works with BASH).

if [ "$TERM" = "msys" ] then export TERM=cygwin fiOtherwise, vim, less, man, mc... won't work as expected.

permalink: 3/23/2014 0 comments

Labels: shells & terminals