Yavuz Lab

Research

Here are a list of the research projects.  Click on project to see more.

Current Research:

Atomic Localization

(Codename: E.I.T.)

Diffraction limits how tightly light can be focused. This limits resolution in optical microscopy and lithography and sets a minimum volume that can be addressed with a laser beam. Beating the diffraction limit could allow for smaller microchips and for more powerful microscopes. Being able to address a smaller volume could be very useful in quantum computing. We seek to work around the diffraction limit by using the nonlinear power dependence of Electromagnetically Induced Transparency (EIT) to transfer atoms in very small regions, smaller than the diffraction limit. Our most recent work has localized atoms to regions ~100nm wide, 1/8 the wavelength of our lasers!
Current Students: Dipto Das
Past Students: Jared Miles, Zach Simmons, Nick Proite
Selected Related Article:
Localization of Atomic Excitation Beyond the Diffraction Limit Using Electromagnetically Induced Transparency (Experiment - 2015)

Observation of Atom Localization Using Electromagnetically Induced Transparency (Experiment - 2011)

Axion Detection

Axions are low mass hypothetical particles that are postulated to exist outside the Standard Model. Their existence would solve multiple puzzles in particle physics, such as the strong CP problem. Because of their weak interactions, they are hard to detect and none have been detected as of yet. We are considering an experimental scheme to detect these using laser-based four-wave mixing, which is mediated by the hypothetical axion field. By resonant enhancement of the interaction, this has the potential to detect axions at a very high sensitivity. 
Current Students: Shay Inbar

Left-Handed Electromagnetic Waves

(Codename: Project Green Lantern)

Green laser   Burned Spectral Hole
Two main challenges to creating a negative index of refraction at optical frequencies are the need for a high density of oscillators and the need for a strong magnetic response at optical frequencies.  Using a rare-earth doped crystal can address both of these issues.  Europium has a strong magnetic dipole transition at 527 nm, and being in a solid means it has a potential to have a much higher density than a MOT or a FORT.  Our ultimate goal is to create left-handed waves in a europium doped yttrium orthosilicate crystal. 
Current Students: [your name here!]

Past Students: Zach Buckholtz, Nick Brewer, Zach Simmons
Selected Related Articles:

Molecular Modulation

(Codename: Project Rainbow)









Our ultrafast project focuses on the modulation of light at molecular frequencies. Our modulator takes incident laser light and shifts the frequency of a fraction of it, turning one monochromatic laser beam into multiple coherent beams of different colors. By stimulating Raman scattering on vibrational and rotational molecular transitions, we modulate continuous-wave light at frequencies up to 100 THz. This shifts the wavelength by up to hundreds of nanometers. Using this technique, we are working toward generating an extremely broad coherent light source. This "white laser" will have several million Fourier components spanning the optical spectrum from the far ultraviolet to the infrared. In addition to a variety of spectroscopic applications, such a broad coherent source would permit the exploration of ultrafast processes. Exciting potential uses include the generation of light pulses that last less than a femtosecond and the creation of arbitrary waveforms at optical frequencies.


Current Students: None (Interested? Contact us!)
Past Students: David Gold, Josh Karpel, Josh Weber, Tyler Green
Selected Related Articles:

Superradiance

No quantum computer can be completely isolated from the rest of the universe, and so any quantum computer will be subject to decoherence effects from interactions with its environment, causing errors in the computation.  Much progress has been made to demonstrate that the errors caused by a wide variety of sources can be corrected for, using extra ‘qubits’ (the quantum analog of a bit) and extra steps in the computation.  However, we suspect that a phenomenon known as Superradiance is a source of error which cannot be corrected for.  Any system with two energy levels, such as a qubit, has a probability of spontaneously jumping from the higher energy level to the lower one, in a process called spontaneous emission.  This kind of error can be corrected for, so long as the rate at which this process occurs is low enough.  However, when many two level systems are near each other, such as in a quantum computer with many qubits, the rate of spontaneous emission increases with the number of qubits.  This means that when the quantum computer is large enough, the rate of spontaneous emission may become so high that it causes errors which cannot be corrected, which would put a limit on the size of a functional quantum computers.  We are currently trying to determine if it is true that superradiance will limit the size of a quantum computer, and if so, estimate this size limit.
Current Students: None (Interested? Contact us!)
 
Past Students: Ben Lemberger
Selected Related Articles:
Superradiance as a source of collective decoherence in quantum computers (Theory - 2014)

Refrative Index Engineering

There has been much progress in the last few decades manipulating the optical response of atomic media to create interesting effects like slow and stopped light. We aim to engineer the index of refraction in atomic systems using Raman and related effects. Many interesting questions arise: Is it possible to create a large index in an atomic gas while eliminating absorption? Can we engineer a negative index of refraction in an atomic system? Applications range from nano-scale optical microscopy to quantum information to more far-out applications like creating 'perfect' lenses.
Current Students: Shay Inbar
 
Past Students:  Jared Miles, Zach Simmons, Dan Sikes, Nick Proite
Selected Related Articles: