D-PRESENTATION

Presentations

(P. S. Bhatia)

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VG-PROJECT-1 and

VG-PROJECT-2

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Presentations related to current (Year 2023 !) research in progress are given below.

Project-1

Talk Title: Enhancement of Nonlinear Optical Effects in Ultra-Cold Atoms & Molecules

Using Quantum Interference Effects

( With EIT and Slow Light Pulses)

Talk Abstract: In this talk, introduction to fields of nonlinear optics, nonlinear spectroscopy, electromagnetically induced transparency (EIT), and slow optical pulses will be provided. A theoretical scheme for enhancement of generation efficiency of four-wave mixing (FWM) process occurring in ultra-cold atoms and using multiple EIT dressing fields & multiple slow optical pulses will then be presented. Implementation of this four-wave mixing (FWM) scheme within the magnetic m-levels of D1 line of ultra-cold Cesium (Cs) atoms will next be provided. Prediction of un-usually large increase in the generation efficiency of nonlinear signal due to effect of EIT, effect of ultra-cold atoms, and effect of ultra-slow optical pulses will then be discussed. Full experimental detail of a large-scale cold-atom nonlinear optics laboratory facility required to demonstrate this prediction will next be described. Planning for future experimental studies using this laboratory facility will then be discussed. Such experimental studies include nonlinear optical properties of BEC atoms, high-sensitive and high-resolution nonlinear spectroscopy of ultra-cold BEC atoms/ molecules, strong field effects such as dressed states in ultra-cold atoms, and measurement of nonlinear susceptibility of single ultra-cold atom. Impact of this research, planning for opening this experiment, and where is this new and fast growing field of cold-atom nonlinear optics headed?, will finally be provided in the concluding remarks of this talk.

Presentation: View Graphs (VG) related to this talk can be found in a pdf file, which can be downloaded. This Pdf file will allow you to view complete Seminar Talk on this project, right on your computer screen.

Download: (*VG-PROJECT-1) pdf

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Project-2

Talk Title: Generation and Applications of Genuinely Entangled

Multi-Photon States to Quantum Communication

: A Step towards Quantum Communication Photonic Network at Telecom Wavelength

TalkAbstract: In this talk, introduction to very new and very rapidly advancing field of quantum information science (QIS) will be provided. Concept of genuine entanglement in complex multi-qubit entangled states such as Greenberger-Horne-Zeilinger (GHZ), highly persistent Cluster, and newly discovered & highly entangled Brown and Borras States will then be discussed. High intensity sources, based on ultrafast (femtosecond) laser pulse excitation of nonlinear optical crystals, high efficiency photon number resolving (PNR) superconducting nanowire single photon detectors (SNSPD), and coincidence counting electronics, for experimental generation and detection of such complex multi-photon entangled states will then be presented. Theory of multi-party quantum communication, which requires splitting and subsequent regeneration of qubit to be teleported, will then be discussed. Complete detail of a photonic experiment implementing this theory will then be presented. In this experiment, the entanglement resource for communication, is provided by laboratory generated multi-photon entangled states. Experimental set-up and experimental procedure required to demonstrate an elementary quantum communication photonic network, which fully operate at the telecom wavelength near 1.5(micrometer) will then be presented. Operation of this quantum network will be shown to depend on the inseparability property of the quantum channel used to quantum wire different nodes of the network. Impact of this research, planning for opening this experiment, and where is this field of quantum information science (QIS) headed?, will finally be discussed in the concluding remarks of this talk.

Presentation: View Graphs (VG) related to this talk can be found in a Pdf file, which can be downloaded. This Pdf file will allow you to view complete Seminar Talk on this project, right on your computer screen.