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Student Seminar: Harnessing quantum exceptional points and enhanced sensing in cavity systems’

by | Nov 20, 2024 | research | 0 comments

Student Seminar
Name: Mr. Suraj Halder
 
Title: ‘Harnessing quantum exceptional points and enhanced sensing in cavity systems’
Date & Time: Wednesday, 20th November 2024 at 4.00 p.m. 
Venue: Rajarshi Bhattacharya Memorial  Lecture Hall, Chemical Sciences Building
Abstract:  
Non-Hermitian physics explores systems with complex eigenvalues and eigenstates, particularly focusing on exceptional points (EPs)1. EPs represent unique degeneracies where eigenvalues and eigenvectors coalesce, leading to enhanced sensitivity and novel physical phenomena, with applications in sensors and quantum technologies. The general theory of sensors based on the detection of the splittings of resonant frequencies or energy levels operating at the Eps. In recent years, the exploration of exceptional points, particularly their topological characteristics, has led to the development of mechanisms for enhancing the sensitivity of optical cavities for detecting nanoscale objects. Studies have demonstrated the feasibility of advanced nanofabrication techniques and on-chip cavity sensors operating at exceptional points2,3. We will discuss the general theory of EPs and how to operate the sensors at EPs4,5.
 
References:
  1. Ashida, Y., Gong, Z., & Ueda, M. (2020). Non-Hermitian physics. In Advances in Physics (Vol. 69, Issue 3, pp. 249–435). Taylor and Francis Ltd. https://doi.org/10.1080/00018732.2021.1876991
  2. Chen, W., Özdemir, Ş. K., Zhao, G., Wiersig, J., & Yang, L. (2017). Exceptional points enhance sensing in an optical microcavity. Nature, 548(7666), 192–195. https://doi.org/10.1038/nature23281
  3. Hodaei, H., Hassan, A. U., Wittek, S., Garcia-Gracia, H., El-Ganainy, R., Christodoulides, D. N., & Khajavikhan, M. (2017). Enhanced sensitivity at higher-order exceptional points. Nature, 548(7666), 187–191. https://doi.org/10.1038/nature23280
  4. Wiersig, J. (2014). Enhancing the sensitivity of frequency and energy splitting detection by using exceptional points: Application to microcavity sensors for single-particle detection. Physical Review Letters, 112(20). https://doi.org/10.1103/PhysRevLett.112.203901
  5. Wiersig, J. (2016). Sensors operating at exceptional points: General theory. Phys. Rev. A 93, 033809 – Published 4 March 2016 https://link.aps.org/doi/10.1103/PhysRevA.93.033809