Laser Physics and Quantum Optics ProjectVisitors in 1998 
Susana will give a talk in the HIP seminar series (basement lecture room) on Tuesday Feb. 3 at 10.15:
Title: Improved frequency standards using quantum entanglement
Abstract:
The optimal precision of frequency measurements is discussed, both in
ideal and noisy conditions. We analyze different preparations of twolevel
systems as well as different measurement procedures. It will shown that
standard Ramsey spectroscopy on uncorrelated atoms and optimal
measurements on maximally entangled states provide the same resolution.
The best accuracy is achieved using partially entangled states with a
high degree of symmetry.
Martin will give a talk in the HIP seminar series (old TFT lecture room) on Thursday Feb. 5 at 10.15:
Title: Entanglement in Quantum Information Theory
Abstract:
Initially it was thought that quantum entanglement manifests
itself only in the violation of Bell inequalities and is therefore only
of use in fundamental tests of quantum mechanics. In this talk I will
show that there is more to entanglement. Entangled states have developed
into fundamental tools used in quantum information theory which allow
applications such as quantum state teleportation or secure quantum
cryptography, both of which can be implemented experimentally.
He will give a talk in the HIP seminar series (basement lecture room) on Tuesday May 12 at 10.15:
Title: Counterintuitive Techniques for Pulsed Laser Population Transfer
Abstract:
During the last decade a class of techniques has become available for inducing
complete population transfer between excited states of atoms or molecules. In
simplest form the procedure uses a stimulated Ramantype coupling in which the
Stokes pulse (coupling the desired target state to an intermediate state)
occurs before the pump pulse (coupling the initial state to the
intermediate state). The pulse ordering reverses the intuitive order used
with incoherent excitation. The success of the stimulated Raman adiabatic
passage (STIRAP) depends on the creation and retention of an optical
coherence with the Stokes pulse  the creation of a population trapping
state. I will discuss some of the numerous theoretical and experimental
extensions of the simple concept, which has application not only to the
preparation of selected rotationalvibrational states of molecules but
also to quantum optics and the preparation of specialized photon states.
He will give a talk in the HIP seminar series (HIP Seminar Room) on Friday September 11 at 10.15:
Title: Coherently Driven Dynamics in Atoms: Suppression of Ionization and Novel Atom Optics Elements
Abstract:
Coherent radiation has become a versatile tool for the manipulation of
atomic and molecular states and processes. After a brief review of the
basic concept of coherent population transfer, emphasizing the relevance of
trapped state formation and exemplifying it by experimental data, the use
of such concept to control processes will be discussed. Specifically,
recent results about very pronounced laserinduced continuum structure
(LICS) in the ionization of Heatoms out for one of their metastable states
will be presented. Furthermore, the flexibility gained will be demonstrated
using the experimentally realized laserinduced dissipationfree deflection
of atoms and a variable matter wave beam splitter as an example.
Dagmar will give a talk in the HIP seminar series (basement lecture room) on Tuesday September 29 at 10.15:
Title: How far can we go with quantum cloning?
Abstract:
In the context of quantum information theory and quantum computation some
fundamental issues of quantum mechanics have recently received increasing
interest, one of them being quantum cloning. Perfect copying of an unknown
quantum state is impossible, due to unitarity and linearity of quantum
mechanics (nocloning theorem). I will discuss the possibility of imperfect
quantum cloning and show which upper limit for the quality of the copies
can be reached. The optimal cloning transformation depends on the scenario
(e.g. statedependent versus stateindependent cloning, number of given
inputs and created outputs). The connection to quantum state estimation
will also be explained.
