In this talk I will present a novel differential amplification scheme for quantum homodyne detection which increases the signal-to-noise for the detection of a quantum signal by 3dB relative to previous known methods. I will also present an open-source quantum photonic design suite used to model this and other photonic integrated circuits.
In this talk, I will describe a number of open source photonic simulation packages developed in our group for modeling large scale classical and quantum photonic circuits. These include Simphony, a high speed photonic circuit simulator; SiPANN, a photonic simulation package based on neural networks; and EMEPy, an eigenmode expansion package. Direct integration with quantum photonic circuit solvers, such as Strawberry Fields, allows for quantum photonic circuit simulation that is hardware-aware and device-specific.
Si-Ge lateral avalanche photodiodes (Si-Ge LAPDs) are promising devices for single photon detection, but they also have technology challenges. Si-Ge LAPDs are CMOS compatible and capable of detecting photons near the 1550 nm telecommunications bands. However, the Si-Ge LAPD exhibits a unique avalanche multiplication process in silicon, where the electrons and holes follow curved paths in three-dimensional space. Traditional models for the analysis of the avalanche multiplication process assume one-dimensional paths for the carriers that undergo the chains of impact ionizations; therefore, they are not suitable for analyzing the avalanche properties of Si-Ge LAPDs. In this paper, the statistics of the avalanche process in the Si-Ge LAPD are modeled analytically using a method that was recently developed by our group for understanding the avalanche multiplication in nanopillar, core-shell GaAs avalanche photodiodes, for which the electric field is non-uniform in magnitude and direction. Specifically, the calculated mean avalanche gain and the excess noise are presented for the Si-Ge LAPD device. It is also shown that the avalanche characteristics depend upon the specific avalanche path taken by the carrier, which depends, in turn, on the lateral location where each photon is absorbed in the Ge absorber. This property can be exploited to achieve reduced excess noise as well as wavelength-sensitive single-photon detection.
We review the physics of photon-phonon coupling in guided wave systems, and discuss new opportunities for
information transduction aorded by nanoscale connement of light and phonons within a novel class of optome-
chanical waveguide systems. We present a fundamental analysis of optical forces generated through nanoscale
light-matter interactions, and use these insights to develop new approaches for broadband signal processing via
optomechanics. Recent experimental results will also be discussed.
Recent advance in controlling optical forces using nanostructures suggests that nanoscale optical waveguides are capable
of generating coherent acoustic phonons efficiently through a combination of radiation pressure and electrostriction. We
discuss the critical roles of group velocity in such processes. This photon-phonon coupling would allow an acoustic
intermediary to perform on-chip optical delay with a capacity 105 greater than photonic delay lines of the same size.
Using coherence enhanced nonlinear optics we observe absorptive
switching in hot Rubidium atoms. Electromagnetically induced
transparency helps create a larger absorptive Kerr nonlinearity
enabling strong absorptive switching with laser intensities of
10 microwatts per square centimeter. Switching is interpreted in terms of optical pumping into and out of the "dark" state.
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