Dr.
Perry Rice,
Professor
Mambwe
Mumba, Grad
Dyan Jones, Grad
Joe Leach,
Grad
What is Quantum Optics?? Our eventual goal
is to create and control novel
quantum states of light and matter for
eventual use, as well as to learn more about
the basic quantum physics.
Study the interaction between light and atoms.
Determine what is explicitly quantum mechanical about light, atoms,
and their interaction.
Interested in the noise properties and correlations of various optical signals.
Sometimes the noise IS the signal.
Propose ways to control atoms and light, create specific quantum states and
study their properties.
Propose and conduct tests of quantum mechanics and the standard model,
as well as statistical mechanics.
Use light and atoms to construct interesting and useful devices – nano lasers,
quantum computers, quantum cryptography systems, displays,
electro-optical hybrids, communication systems.
Currently, we are pursuing research in the following areas, along with several collaborators.
Field-Intensity
Correlation Functions - A
new type of correlation function,
first investigated by Dr. Howard Carmichael's group is a
field-intensity
correlation function. Experimentally, one gets a trigger signal from a
photodetector (probability proportional to the intensity of the field)
and then performs a balanced homodyne measurement of the field
conditioned
on the first photodetection. Measurements have been made at Dr. Luis
Orozco's
group at SUNY Stony Brook for N atoms in a driven damped optical
cavity, making electric field measurements at the sub-photon level.
We have participated in doing calculations outside the weak field
limit.
We have also done calculations where the transmitted/fluorescent field
is measured based on photodetection in the fluorescent/transmitted
mode's.
We have also done calculations for a two-level atom inside an optical
parametric
oscillator in all 4 cases (T/T, T/F, F/T, F/F). Also for a cavity QED
system with 1-d quantized center of mass motion
Cavity
QED
with Quantized Center of Mass motion - We have considered
the photon statistics and wave-particle correlations for a cavity QED
system, with one atom, and an optical lattice along the cavity axis. We
find that in many cases, it is not neccesarily advantageous to use a
localized atom as opposed to an atomic beam. The nonclassical behavior
in the wave-particle correlations are more robust than those in the
photon-photon (intensity) correlations.
Quantum
Information and Computation - We are interested in the use
of cold atoms, optical lattices, and cavity QED systems as elements of
a quantum computation/communication system. We are looking at ways in which
disspipative processes can create entanglement in a variety of cavity
QED systems. The cavity QED system with quantized center of mass motion
gives us extra degrees of freedom to create quantum logic gates and
network elements.
Numerical Simulations of Nano-Probes and Nano-Structures - We are using Finite Difference Time Domain methods to study various nanoscale metallic particles. We look for solutions of Maxwell's equations for such structures, to calculate the electric field as a function of position on and around the nanoparticles. In addition, the plasmon resonances are identified as a function of particle size, geometry, and type of metal. These results provide information on what might be seen by a near-field probe when light of a particular polarization illuminates the metallic particles brought in close proximity to systems under investigation. We consider various nonlinear interactions in systems which have applications in optical communications, electronics, and bio-sensing. This is being done in collaboration with Dr. Yarrison-Rice's group and others at the M. U. Institute for Nanotechnology.
Quantum
Interference Effects in Cavity QED Systems-
Quantum interference between two "paths" can enhance or suppress the
probability
of transitions. Recently there has been much interest in
Electromagnetically
Induced Transparency (EIT) and Lasing Without Inversion (LWI). These
phenomena
deal with interference between indistinguishable "paths" for a photon
to
take in a 3-level system. We have mainly concentrated on a single-two
level
atom inside a resonant cavity, with weak excitation, in the strong
coupling
regime. This system is a 3-level system with coupling of the upper
levels
due to atom-cavity coupling. We have identified quantum interference
effects
in spectra as well as in the photon statistics of this system. Recent
experimental
results on the photon statistics by researchers at S. U. N. Y. Stony
Brook
go outside the weak-field limit, and we are modeling those systems.
Another
system of interest is a two-level atom inside an Optical Parametric
Oscillator,
a source of squeezed light. Here we see new interference phenomena in
the
spectra, perhaps due to the indistinguisability of the source pair of
photons.
We have been collaborating with researchers at the University of Dayton
and the University of Arkansas.
Photon
Statistics and Dynamics of Trapped Atoms - We are working on the photon statistics of
optically dense atom clouds in MOT's, in support of the experiment's in
Dr. Bali's lab. We are also working on the dynamics of atomic motion in
optical lattices, and possible signatures in photon-correlation
experiments.
Measurement
of Squeezing - We are
working on a better understanding of the typical squeezing
measurements, for short lived atoms and weaker driving fields off
resonance, and the experiments of Thomas, Bali and *, using a
stochastic Schroedinger equation approach.
Microcavity
Lasers - Recent
advances in Cavity Quantum Electrodynamics have enabled researchers to
control the emission properties of atoms. This may lead to more
efficient
lasers, particularly small semiconductor lasers for use in optical
processing,
communication, and displays. Systems include bulk and quantum well
media
inside microdisk lasers, and localized excitons in thin quantum wells
with
Bragg reflectors as in a VCSEL. We are working with colleagues at the
University
of Dayton, University of Oregon, and Lucent Technologies Bell
Laboratories
to understand the properties of the light emitted by such lasers.
Interaction of Squeezed Light with Optical Systems- Squeezed light is light that is in some sense "quieter" than no light at all. Since the seminal work of Crispin Gardiner, the interaction of squeezed light with optical systems has been of much interest. We have investigated a single two-level atom inside a resonant cavity as well as Scully-Lamb type lasers. Here we have worked with researchers at the Unversity of Dayton and the University of Arkansas.
Photonic Band Gap Materials and Applications to Quantum Optics - We are doing some preliminary band-gap and mode calculations in support of experiments underway in Dr. Yarrison-Rice's group. The idea is to investigate these novel materials and their application to waveguides and fundamental cavity QED experiments.
Photorefraction- Pedagogical treatment of the photorefractive effect, in collaboration with Dr. Yarrison-Rice’s group.
Modern Optics Labs for Upper Level Undergraduates- NSF funded senior level sequence. Laser Physics in the fall, and Spectroscopy in the spring. Drs. Marcum and Yarrison-Rice are the Co-PI’s. Lab work is emphasized, including lasers, fiber optics, second-harmonic generation, signal processing using phase conjugation, optical tweezers, saturation spectroscopy, and a magneto-optical trap.
Current Group Members - Those that do most of the work.
Alumni- Where are they now?