Session Overview |
Light-matter Interactions at the quantum limit: atoms, molecules and photons - Bloc 3Room: International 2 |
Date: Tuesday, June 05 |
15:30 |
Building quantum machines out of light
Main Author: Ian Walmsley Organization: University of Oxford, United Kingdom Optical networks offer the possibility of preparing large-scale entangled states that can be used as key elements of functional quantum information processing devices, including distributed sensors, communications, and even quantum simulators and computers. Progress in the development of hybrid light-matter networks for these and other applications. |
15:55 |
Large-Scale Programmable Photonic Circuits and Applications in Quantum Information Processing
Main Author: Dirk Englund Organization: Massachusetts Institute of Technology, United States Photonic integrated circuits (PICs) have become increasingly important in classical communications applications over the past decades, including as transmitters and receivers in long-haul, metro and datacenter interconnects. Many of the same attributes that make PICs attractive for these applications — compactness, high bandwidth, and the ability to control large numbers of optical modes with high phase stability — also make them appealing for quantum information processing. The first part of this talk will review our recent progress in adapting one of the leading PIC architectures—silicon photonics—for various quantum secure communications protocols. The second part of the talk will consider how photonic integrated circuits technology can extend the reach of quantum communications through all-optical and memory-based quantum repeater protocols. Beyond quantum communications, PICs are also finding application in quantum computing and in classical signal processing applications, including artificial neural networks. |
16:20 |
Quantum networks: global, warm, biological?
Main Author: Christoph Simon Organization: University of Calgary, Canada The creation of a global quantum network is now a serious possibility by combining satellite links and quantum repeaters. I will briefly describe the overall vision in light of recent progress. One interesting new frontier is the implementation of quantum networks with components that can operate at room temperature. I will describe two recent relevant proposals from my group. Another fascinating, if highly speculative, question is whether quantum networks could exist in the brain. Photon sources and potential detectors seem to exist in the brain. We recently proposed that axons could serve as optical communication channels. Coherent spins also seem to be available. However, coherent spin-photon interfaces remain to be found. I will also discuss potential uses of quantum effects in the brain. |
16:45 |
Building a room temperature quantum processing network
Main Author: Eden Figueroa Organization: Stony Brook University, United States Light-based quantum computers and cryptographic communication networks require fundamental components that can store, retrieve and manipulate photonic qubits and entanglement. In the first part of my talk I will show how to build devices such as quantum memories and logical gates by optically manipulating the properties of room temperature atomic clouds. I will also describe our latest results regarding the construction of an elementary analog quantum computer capable of simulating Dirac relativistic dynamics using atoms and quantized light. In the second part I will present our recent experiments in which several quantum devices are already interconnected forming a large quantum processing networks. Finally, I will discuss the prospects of this unique system to serve as both a long-distance quantum communication network and a programmable quantum processing unit. |
17:10 |
Coherent storage and manipulation of broadband photons via dynamically controlled Autler-Townes splitting
Main Author: Khabat Heshami Organization: National Research Council of Canada The electromagnetically induced transparency (EIT), which is a quantum interference effect has been extensively explored in coherent control of light and matter. For strong control fields that leads to wide transparency window this quantum interference effect vanishes. This is known as the Autler-Towns splitting (ATS), where the excited state splits into a doublet due to AC Stark shift. To date, it is an open question whether ATS can be directly leveraged for coherent control as more than just a case of “bad” EIT. In this work, we develop a coherent control method based on dynamical control over the ATS effect. We use this technique for coherent manipulation and storage of light in an ensemble of laser-cooled Rb atoms. We demonstrate storage of nanosecond pules for up to a microsecond and show that our approach relaxes technical requirements intrinsic to previous memory schemes. |
17:25 |
Demonstration of an arbitrary two-photon polarization projector
Main Author: Lambert Giner Organization: University of Ottawa, Canada At the moment, any single photon polarization state and particular two-photon polarization states (e.g. Bell states) can be projected onto. In this paper, we experimentally demonstrate a method to project onto an arbitrary two-photon polarization state using linear optics. This opens the door to novel quantum information tasks such as enhanced efficiency state tomography. |