Quantum Interferometer

Jonathan Dowling from Louisiana State University gave a presentation about the use of entangled photons for high precision interferometry [1] showing that they can lead to much better measurements than it is possible with classical light. These entangled photon states are of the form

Some problems remain such as the difficulty to produce NOON states with high power, but they are very promising anyway.

So far they devised how to make ingenious conditional measurements in order to generate NOON states.

Another important topic was the emulation of non-linear effects by conditional measurements within linear optics [2].

Refererences

1. J Dowling arXiv:0904.0163
   
2. G. G. Lapaire1, et al, Conditional linear-optical measurement schemes generate effective photon nonlinearities DOI: 10.1103/PhysRevA.68.042314
   
3. Jonathan Dowling ppt presentation
   

LaTeX was possible in this entry with MathTran

Human chromosome 2

Humans have 23 chromosomes while all the other hominids have 24 chromosomes. The question is, how can this be possible if we are suppose to have a common ancestor. Now we know that human chromosome 2 is the result of the fusion of two chromosomes found in our relative hominids.
YouTube:Chromosome 2

Quantum Feedback Control

Kurt Jacobs gave a presentation about Quantum Feedback Control. He showed how to introduce the action of weak continuous measurements into a master equation that. This equation resembles the Lindblad equation with an extra stochastic term, where the feedback can be introduced in the Hamiltonian. One application was to create a cat state of a harmonic oscillator.

Adiabatic quantum complexity

The adiabatic quantum computer was proposed in arXiv:quant-ph/0001106v1 in order to solve certain type of problems.

For low dimensions it was shown that the adiabatic quantum computer is polynomial, for a certain problem with exponential complexity in a classical computer. Peter Young, who gave a presentation at Princeton yesterday, is using Quantum Montecarlo Simuations, as used in statistical mechanics for the partition function, in order to engage this problem for higher dimensions where direct simulations are not feasible.
The Complexity Of The Quantum Adiabatic Algorithm

Intelligence gene

The following article seems to indicate that there is a gene that is associated with higher intelligence, but those who have it are in disadvantage in high pressure exams
memory gene

Epigenetics

Epigenetics studies the effect of the environment on the expression of genes. A saw the following NOVA tv program
http://www.pbs.org/wgbh/nova/genes/issa.html
and I was very surprised.

LaTeX in my blog

I want to write equations in my blog, so I found mimetex, but I could not run it from the cgi Princeton server. I do not know why. I may need to set up complicated permissions or there is a compatibility issue between mimetex and the cgi server.

Here I am testing the cgi provided by mimetex



It works, but I can only use it as a test.

Another method, less elegant though, is using MathTran, which I used to make the following equation