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Physicist | PMRF | SPMF | AIR 04 NET-JRF | SRF | B.Tech

I completed my B.Tech. in Engineering Physics in 2018 from IIT Guwahati. Then, I directly joined as Ph.D. scholar in Atom based Quantum Technologies Lab. in the Dept. of Physics, IIT Guwahati under the supervision of Dr. Kanhaiya Pandey. My thesis work is entitled as Laser Cooling and Trapping of Rubidium at Narrow Transition. Recently, I have been awarded with the prestigeous Prime Minister's Research Fellowship (PMRF) in the May 2020 and Shyama Prasad Mukherjee (SPM) Fellowship in Dec. 2021.

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my education


Ph.D. Physics

Coursework CPI: 9.54/10

Dept. of Physics, IIT Guwahati

2014 - 2018

B.Tech. Engineering Physics

CPI: 8.44/10

Dept. of Physics, IIT Guwahati

2011 - 2013

Higher Secondary

Percentage: 91.6%

Cotton College, Guwahati


High School Leaving Certificate Examination

Percentage: 87.3%

Sankardev Sishu Vidya Niketan Ambari

my experience

Sept. 2020 - Present

Prime Minister's Research Fellow

Dept. of Physics, IIT Guwahati

July 2020 - Aug 2020

Senior Research Fellow

Dept. of Physics, IIT Guwahati

July 2018 - June 2020

Junior Research Fellow

Dept. of Physics, IIT Guwahati

May 2016 - July 2016

Summer Intern

Physical Sciences Division, Institute of Advanced Study in Science & Technology Guwahati

Teaching Responsibilities

Feb 2021 - March 2023

Course Instructor

B.Sc. Physics Major, North Gauhati College, Gauhati University

Topics Covered:

Laser Physics, Solid State Physics, Differential Equations, Tensor Algebra

Jan 2019 - Sept 2022

Teaching Assistant

B.Tech. 1st year, IIT Guwahati

Topics Covered:

Classical Mechanics, Quantum Mechanics, Special Theory of Relativity, Electrodynamics

My Research Projects

2018 - Present

Laser Cooling and Trapping of Rubidium at Narrow Transition

Ph.D. Thesis work

Supervisor : Dr. Kanhaiya Pandey, Associate Professor, Dept. of Physics, IIT Guwahati

2018 - 2020

Computer Control System for Cold Atom Experiments: Hardware and Software

Supervisor : Dr. Kanhaiya Pandey, Associate Professor, Dept. of Physics, IIT Guwahati

2017 - 2018

Temporal Evolution of Laser produced Plasma using Langmuir Probe

Bachelor’s Thesis work

Supervisor : Prof. Alika Khare, Professor, Dept. of Physics, IIT Guwahati


Horizontal Rotation of Nano Dust Cloud in Cylindrically Symmetric Unmagnetized Dusty Plasma

Internship project

Supervisor : Prof. Heremba Bailung, Professor, Physical Sciences Division, IASST


Compact IC Tester Design using Arduino & Visual Basics

Self Project


Cricket Scorecard Projection System for Lohit Premier League

Self Project

My Publications


Role of spontaneously generated coherence (SGC) in laser cooling of atoms

Rajnandan Choudhury Das, Samir Khan, Thilagaraj R, Kanhaiya Pandey

Arxiv 2402.04234(2024)

View the Article


Direct spectroscopy of Rubidium using a narrow-line transition at 420 nm

Rajnandan Choudhury Das, Samir Khan, Thilagaraj R, Kanhaiya Pandey

The European Physical Journal D 78.40 (2024)

View the Article


Continuous loading of magneto-optical trap of Rb at narrow transition

Rajnandan Choudhury Das, Samir Khan, Thilagaraj R, Kanhaiya Pandey

Arxiv 2401.08286(2024)

View the Article


Atomic coherence based multi lasers interferometry

Dangka Shylla, Rajnandan Choudhury Das, Kanhaiya Pandey

(under preparation)


Narrow-line cooling of 87Rb using 5S1/2 → 6P3/2 open transition at 420 nm

Rajnandan Choudhury Das, Dangka Shylla, Arkapravo Bera, Kanhaiya Pandey

J. Phys. B: At. Mol. Opt. Phys. 56.025301(2023)

View the Article


Effect of detuning on velocity induced population oscillation

Dangka Shylla, Elijah Ogaro Nyakang'o, Rajnandan Choudhury Das, Kanhaiya Pandey

The European Physical Journal D 76.125 (2022)

View the Article


Laser Cooling Mysteries & Harry’s Heroics in Quantumverse

Rajnandan Choudhury Das

In AWSAR Awarded Popular Science Stories By Scientists for the People- 2021, Vigyan Prasar, Dept. of Science and Technology, AW/2021/4161.ISBN: 978-81-7480-337-5. 2022.

Accepted Notification

Awards & Scholarships

May 2023

Best Oral Presentation

Research & Industrial Conclave- Integration 2023,

IIT Guwahati

March 2023

Best Oral Presentation

National Raman Memorial Conference 2023,

Savitribai Phule Pune University

Feb. 2022

AWSAR Award 2021

Dept. of Science & Technology, Govt. of India

Dec. 2021

Shyama Prasad Mukherjee (SPM) Fellowship

Council of Scientific and Indsutrial Research (CSIR)

July 2021

Certificate of Quantum Excellence

2021 Qiskit Global Summer School on Quantum Machine Learning, IBM Quantum

Sept 2020

Prime Minister's Research Fellowship (PMRF)

Ministry of Education, Govt. of India

July 2018 - Sept 2020

MHRD Teaching Assistantship

Ministry of Human Resource Developement, Govt. of India

2015 - 2016

Institute Merit-cum-Means Scholarship

Indian Institute of Technology Guwahati

2014 - 2015

Chief Minister’s Scheme for Financial Assistance to Meritorious Students of Assam

Chief Minister, Govt. of Assam

2011 - 2012

Chitra Visharad Award

Pracheen Kala Kendra, Chandigarh


Anundoram Borooah Award

Education Dept, Govt. of Assam

2007 - 2008

Chitra Bhushan Award

Pracheen Kala Kendra, Chandigarh

Academic Achievements


All India Rank 04

in CSIR-UGC NET JRF, Physical Sciences


All India Rank 209

in GATE 2019, Physics


Dept. Rank 01

in Ph.D coursework, Physics, IIT Guwahati


All India Rank 172

in IIT-JAM, Physics


Dept. Rank 05

in B.Tech, Engineering Physics, IIT Guwahati


99+ Percentile

in JEE Main and JEE Advanced


State Rank 88

in Common Entrace Examination (CEE)


State Rank 67

in JEE Main Paper-I


State Rank 55

in JEE Main Paper-II

Conferences/ Workshops/ Schools

15th Nov- 17th Nov 2023

QTUCA-2023: Conference on Quantum Technologies using UltraCold Atoms

IISER Pune, India

Presented a talk on blue MOT of Rubidium

28th May- 1st June 2023

NWPS-2023: National Workshop on Physical Sciences

NIT Tiruchirappalli, India

Invited guest for the Q&A Session

14th-16th May 2023

RIC-2023: Research & Industrial Conclave- Integration

IIT Guwahati, India

Received First place in Scientifique: Oral Presentation

Participated in 3 Minute Thesis Presentation

12th May 2023

FiOTP-2023: Frontiers in Optics and Terahertz Photonics

IIT Guwahati, India

17th-18th March 2023

RMC-2023: National Raman Memorial Conference

Savitribai Phule Pune University, India

Received First prize: Best Oral Presentation

1st June-5th July 2022

QIQT 2022: Summer school on Quantum Information and Quantum Technology

IISER Kolkata, India

24th-26th Nov. 2021

SCOP 2021: Student Conference on Optics & Photonics

Physical Research Laboratory, Ahmedabad, India

12th-23rd July 2021

2021 Qiskit Global Summer School on Quantum Machine Learning

IBM Quantum

Received Certificate of Quantum Excellence

Conferences/ Workshops/ Events organized

16th Nov. 2020

Optics is not only about optics anymore 2.0

Speaker:Prof. Sile Nic Chormaic

OIST Graduate University, Japan

Title:Ultrathin fiber optics application from atomic physics through quantum optics

14th Nov. 2020

Fantastic Physics & How to find them!

Speaker:Prof. H. C. Verma

Padma Shri 2020

Title:Inside story of the Gold foil Experiment of Rutherford

30th Oct. 2020

Optics is not only about optics anymore

Speaker:Dr. Biswajit Pathak

University of Oxford

Title:Adaptive optics in Opthalmology: Principle, Design and Implementation

17th Oct. 2020

Fantastic Theses & Where to find them!

List of speakers

Dr. Indu Kalpa Dihingia, IIT Indore, "Why I do research?"

Mr. Sampreet Kalita, IIT Guwahati, "Charms & Potions: Out of the box"

Dr. Joy Prakash Das, IIT Guwahati, "Presenting your research ... an underrated essence"

11th Oct. 2020

Ironman to Superman: What if they were teachers!

Speaker: Mr. Sandeep Pathak

Title: Science behind Superheroes

10th Oct. 2020

Breaking barriers in science

on the ocassion of World mental health day

"Career options in Science and Technology" by Dr. Sidananda Sharma

and "Hope: the way forward" by Rakesh Kakati

16th May 2020

Virtual conference on International Day of Light 2020

Day long event with 7 speakers from all over the world attended by 1000+ delegates

List of speakers

Prof. RanjanSingh, NTU Singapore, "Terahertz topological photonics for 6G communication"

Prof. Sudipta Maiti, TIFR Mumbai, "Laser finds ‘Happiness’ How Laser microscopy is helping us understand our brains"

Prof. Ashok Mohapatra, NISER Bhubaneswar, "Dynamical phase transition on Mirrorless optical parametric oscillator"

Prof. Martin Booth, Oxford University, "Adaptive Optics for Microscopy and Photonic Engineering"

Prof. Kishan Dholakia, University of St. Andrews, "Let Nothing slow you down Optical trapping in vacuum"

Prof. Brian Culshaw, University of Strathclyde, "Photonics -what is it and where might it lead?"

Dr. Naresh Chand, Associate Vice President, Chapter Relations, IEEE Ph. Society, "Photonics Opportunities and Challenges in India"

Positions of Responsibilities

2018- 2022


B.Tech. Engineering Physics,

M.Sc. Physics

IIT Guwahati

2020- 2021


SPIE IIT Guwahati Student Chapter

2019- 2020

Technical Secretary

SPIE IIT Guwahati Student Chapter



Pratham Khuj


City Representative

Udaan, Alcheringa, IIT Guwahati

contact me

My email


My number


My address

Dept. of Physics, IIT Guwahati, Assam 781039