Department of Physics, Engineering Physics & Astronomy

Department of Physics, Engineering Physics & Astronomy
Department of Physics, Engineering Physics & Astronomy

CMP Seminar- "Nano-photonic platforms for implementing photon-photon interactions"

Michal Bajcsy
Institute for Quantum Computing and Department of Electrical & Computer Engineering
University of Waterloo

Date: Thursday, March 26th, 2015
Time: 10:30 am
Location: Stirling 401


Photonic nano-structures can provide strong confinement and unprecedented control over the flow of photons. When combined with quantum optics techniques, these structures can be used to engineer strong nonlinear interactions between single-photon or few-photon light pulses with quantum emitters acting as mediators for these interactions. Such systems can be utilized toward novel photonic devices for low-power information processing, as building blocks for scalable quantum information processing applications, and in studies of quantum mechanical phenomena in condensed matter or atomic systems. Demonstrations of single-photon nonlinear optics based on single quantum emitters, as well as ensembles of emitters, and enhanced by nano-photonic structures have been reported extensively over the last few years. However, developing these proof-of-principle platforms − examples of which are shown in the figure below − into more complex, integrated, and practical devices that can be scaled into large architectures will require solving a host of challenging problems. In this talk, I will provide an overview of most promising types of nano-photonic structures and of recent experiments implementing photon-photon interactions in these structures. A slight focus will be given to self-assembled InAs quantum dots embedded in GaAs photonic-crystal nanocavities based on this platform’s compatibility with semiconductor fabrication processes and it’s promise for scaling up to more complex systems needed for practical devices. Lastly, I will describe quantum optics experiments and nano-photonic structures my group is currently working on.

quantum optics experiments and nano-photonic structures

Nano-photonic structures interacting with quantum emitters:
(a) A network of nanocavities with single quantum emitters (Source: Greentree et al., Nat. Phys. 2006).
(b) Non-linear optics with cold atoms loaded inside a single-mode hollow core fiber (Source: Physics Viewpoint on Bajcsy et al., PRL 2009)
(c) Cold atoms interacting with the evanescent field of a tapered nano-fiber (Source: Vetsch et al., PRL 2010 )
(d) An on-chip hollow-core waveguide filled with room-temperature atomic vapor (Source: Wu et al., Nat. Phot.2010)