Aspuru Group:
Dr. Kavan Modi, from University of Texas at Austin, and soon at the Centre
for Quantum Technologies at Singapore is visiting the group today. He will
be giving a talk today (Wednesday) at 4pm
in<http://maps.google.com/maps?q=Naito+030&hl=en>Naito 030 titled:
*Fermi two atom problem in extended Fredrichs-Lee Model*
In 1932 Fermi calculated the time required for excitation
transition between two atoms. He found the minimum time to be the
distance between the atoms divided by the speed of light. Recently,
Hegerfeldt, using a very basic argument of analyticity of the
wavefunction, showed that the excitation amplitude of the second atom
must be finite for all times or zero for all times. We are studying
this problem in detail using a modified Fredrichs-Lee model where two
discrete states are connected by a continuum. We can solve for the
transition amplitude exactly in our model, without assuming that a
photon is the mediator between the two discrete modes. Our model
should shed some light on the conceptual difficulties that have
bothered the community for long.
Please attend.
Cesar