Nilakshi - Research

Research Interests

My resaerch area involves studying both theoritical and experimental aspects of multi-photon high-dimensional quantum entanglement for the development of quantum technologies.

Multi-photon Quantum Entanglement

Quantum entanglement with its peculiar and unique properties is the fundamental and natural phenomenon which is widely used for quantum metrology, quantum communication, quantum teleportation, quantum computation and so on. It has opened up an entire new avenue to explore fundamental physics as well as its ability provide us the space to apply it in several way to improve almost every technology that we use today. Initially scientific study was mostly focused on Qubit but now the focus is shifted towards Qudit. In this situtation it's one of my interests to focus on the multi-photon quantum entanglement study.

Coherence and Quantum Interference

Interference is an ubiquitos in the field of science. It provide us with some amazing opportunity to do unique and precise measurements. Working with interferometry have already shown us its power in several way with several celebrated experiments. Coherence is the major phenomenon which work inside to form the interference pattern. The relation of coherence and interference is already shown with many eexperimental demonstration. Working with interferometer set-ups are challenging but very enjoyable at the same time. We use interferometry techniques in our lab for different different research goals.

Quantum Metrology

Supersensitive measurements are the pathways to probe the nature. It can be a microscopic phenomenon or a distant object, to study any of these what we need is the ability to measure it with very very highly sensitive way. Our research goals aim for the development of new schemes for super-sensitive measurement in terms of quantum imaging and quantum tomography.

Photon Statistics

Concept of 'photon' itself is a very strange and unusual understanding. With lots of effort in the past one century scientific community has developed its distingushed properties. LASER light is also a streme of photons, and it follows the photon statistics. With the different different statistics we can actually identify the source, again it is a challange to design a source with a particular type of statistics. Utilizing these kind of unique studies for practical situations are my interests.

High-dimensional OAM basis

Orbital angular momentum of light provide us with the discrete and high-dimensional basis, which make it special and unique. It has several advantages like enhanced system capacities, larger transmission bandwidth and so many more. It is a good candidate for the work related to quantum metrology and quantum communication. And one of the prime focus of our lab is to work with high-dimensional OAM basis.

Master's Thesis

Probing Turbulence in the Interstellar Medium of MilkyWay Galaxy, Supervisor - Dr. Prasun Dutta
In this thesis, we use HI4PI data to probe turbulence in the interstellar medium of the Milky Way Galaxy using neutral hydrogen (H I) 21-cm emission. Here we have explored the physical aspects of the interstellar medium in our galaxy and tried to understand the role of fluid turbulence in it. The ISM of our galaxy consists of lots of dense filamentary and sheet like structures. Here we want to probe the HI medium without these densed structures, thus we have detected the filaments and choose the off filament region to check for velocity channel averaging (VCA). In this work, our result indicates the presence of velocity modification upto a certain scale unlike the previous results. Bimodality characteristics in the orientation of the filaments and qudrupole moment dominated anistropic intersteller medium arise more curosity to find for the causes of these observational results.

VSRP Project

Study of frequency-dependent eclipsing for PSR J2051-0827 with uGMRT, Supervisor - Dr. Bhaswati Bhattacharyya
In this research project, we have presented the frequency dependent eclipsing study for a black widow millisecond pulsar J2051-0827. From the simultaneous dual frequency wide band observation with uGMRT we have observed eclipse at Band 4 and no eclipse at Band 5 at the eclipse phase of Band 4. Frequency dependent study of eclipsing allowed us to decide the onset frequency for this BW MSP 4 times more precise than previously known. With the help of the pulsar timing we have checked for excess electron column density variation with the orbital phase which has showed excess electron column density at eclipse phase than the non eclipse phase. On the basis of these studies we have commented that refraction and pulse smearing should not be the probable eclipse mechanisms for J2051-0827, scattering effect may be present and there is lack of cyclotron absorption at >637 MHz frequency.

ATSOA Project

Studying the corona of solar-type stars using XMM-NEWTON data
Using data reduction techniques we found out the image , spectra and light curve of an eclipsing binary of two solar type stars i.e. of DV Psc. As the result of these light curve and spectrum analysis we found that there are two flaring events in this system. Spectra indicated that it is thermal bremsstrahlung radiation and we fitted the spectra for quiescent state of the star and results shows that quiescent state of DV Psc consists of two temperature plasma with cool and hot temperature components of 0.26 and 1 keV.