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Centre of Advanced Studies in Physics

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Dated: 14.01.07

TPSC SEMINAR NOTICE


                                SPEAKER: Ms. Bindiya Arora

        Physics Department and Astronomy

        University of Delaware, Newark, USA.

                                TITLE:         Modeling of atomic systems for quantum information and atomic clocks

Ab     Abstract

 Recent progress in quantum control of trapped neutral atoms led to a variety
of possible applications. Quantum information and further development
of atomic clocks are of particular interest. There are various
approaches to the experimental realization of the quantum computation.
One of the quantum computation schemes with neutral atoms, where the
qubits are realized as internal states of neutral atoms trapped in
optical lattices or microtraps has many advantages. Furthermore,
development of more accurate atomic clocks resulted in numerous
technological applications and new opportunities for tests of
fundamental science. New generation atomic clocks, based on optical
rather than microwave frequency standards will allow an increase in the
accuracy and stability of atomic clocks by orders of magnitude and lead
to new technological and scientific developments.
   In this talk, I will discuss modeling of atomic systems for quantum information
and atomic clocks. In our group we have conducted extensive
calculations of the electric-dipole matrix elements in alkali-metal
atoms using the relativistic all-order method. This approach is a
linearized version of the coupled-cluster method, which sums infinite
sets of many-body perturbation theory terms. The resulting
electric-dipole matrix elements are used for the high-precision
calculation of frequency dependent polarizabilities of the ground and
excited states of alkali-metal atoms. I will discuss the calculation of
“magic” wavelengths in alkali metal atoms for which the ns and
np1/2 and np3/2 atomic levels have
the same ac Stark shifts, which facilitates state-insensitive optical
cooling and trapping. Next, I will mention the calculation of the
blackbody radiation shift of the 4s1/23d 5/2
clock transition, which is a major component of the uncertainty budget
of the optical frequency standard at room temperature. In the end, I
will describe our attempts.
DATE & DAY: 17 January 2008, Thursday
VENUE: Seminar Hall
TIME: 4.00 P.M. RESCHEDULED TO 2.30 P.M.

    Tea shall be served at 2.15 P.M

   All interested are cordially invited to attend.

  TPSC Convener                                                                                                                                                                 Chairman