Devashish Tupkary

Devashish Tupkary

Graduate Student @ Institute for Quantum Computing

Hi. My name is Devashish Tupkary. I am a graduate student at the Institute for Quantum Computing, Canada, where I was awarded the Mike and Ophelia Laziridis Fellowship. At IQC, I am advised by Norbert Lütkenhaus.

I also work part-time as a Research Analyst at evolutionQ.

Previously, I got my BS(Research) degree from the Indian Institute of Science, Bengaluru in 2020. During my undergraduate degree, I worked with Manas Kulkarni and Abhishek Dhar at ICTS-TIFR.

My CV can be found here : CV
You can email me at : <lastname> . <firstname> @gmail.com

Research Interests

I am broadly interested in the theoretical and practical aspects of quantum information and computation, with a particular focus on Quantum Key Distribution (QKD). During my graduate studies, my work has primarily centered around the security analysis of practical QKD protocols. I remain deeply interested in everything related to QKD.

In addition, I continue to work on accurate desciptions of open quantum systems. Specifically, I am interested in examining the validity of various quantum master equations, independent of specific system-bath setups.

Recently, I have begun to explore classical cryptography and have developed a growing interest in quantitative finance.

Publications and Preprints

  1. Security Proof for QKD for imperfect detectors via phase error estimation. [In preparation]
    Devashish Tupkary, Shlok Nahar, Pulkit Sinha, Norbert Lütkenhaus.
    Talk at QCRYPT 2024.

  2. Security Proof for Variable-Length Quantum Key Distribution. [Phys. Rev. Research 6, 023002]
    Devashish Tupkary, Ernest Y.-Z. Tan, Norbert L"utkenhaus.
    Talk at QCRYPT 2024.

  3. Postselection technique for optical prepare-and-measure QKD protocols. [arXiv]
    Shlok Nahar, Devashish Tupkary, Yuming Zhao, Norbert Lütkenhaus, Ernest Y.-Z. Tan.
    Talk at QCRYPT 2024.

  4. Using Cascade in Quantum Key Distribution. [Phys. Rev. Applied 20, 064040].
    Devashish Tupkary, Norbert Lütkenhaus.
    Poster at QCRYPT 2023, CQGC 2023.

  5. Searching for Lindbladians obeying local conservation laws and showing thermalization. [Phys. Rev. A 107, 062216].
    Devashish Tupkary, Abhishek Dhar, Manas Kulkarni, and Archak Purkayastha.
    Invited Talk at CQIQC Seminar, University of Toronto, 10th Feb 2023. [video link]

  6. Fundamental Limitations in Lindblad Descriptions of systems weakly coupled to baths. [Phys. Rev. A 105, 032208].
    Devashish Tupkary, Archak Purkayastha, Abhishek Dhar, Manas Kulkarni.
    Talk at Non-Hermitian Physics Summer School, ICTS Banglore, 20th March 2021. [video link]
    Poster at Quantum Thermodynamics Summer School, ETH Zurich.

  7. Improved Keyrates for Quantum Key Distribution from two-way classical communication. [Master’s Thesis]
    Devashish Tupkary.
    Poster at Qcrypt 2022.