PANJAB UNIVERSITY, CHANDIGARH – 160 014, (INDIA)

Fax :+ 91-172-2783336

Tel :+ 91-172-2534466

Email: __physics@pu.ac.in__

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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 informationDATE & DAY: 17 January 2008, Thursday

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 thensandnp_{1/2}andnp_{3/2}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 the4s_{1/2}−3d_{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.

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*