Publications (19)
Strong-field Driven Sub-cycle Band Structure Modulation and Dephasing Control
Francis Walz, Shashank Kumar, Amirali Sharifi Olounabadi +6
Over the past decade, ultrafast electron dynamics in the solid state have been extensively studied using various strong light-matter interaction techniques, such as high-harmonic g…
Magnetic field orientation dependence of continuous-wave optically detected magnetic resonance with nitrogen-vacancy ensembles
Pralekh Dubey, Shashank Kumar, Chinmaya Singh +5
Continuous-wave optically detected magnetic resonance (CW-ODMR) measurements with nitrogen-vacancy (NV) spins in diamond are used for sensing DC magnetic fields from nearby magneti…
Accessibility evaluation of websites using WCAG tools and Cambridge Simulator
Shashank Kumar, JeevithaShree DV, Pradipta Biswas
There is plethora of tools available for automatic evaluation of web accessibility with respect to WCAG. This paper compares a set of WCAG tools and their results in terms of ease…
General heat kernel coefficients for massless free spin-3/2 Rarita-Schwinger field
Sudip Karan, Shashank Kumar, Binata Panda
We review the general heat kernel method for the Dirac spinor field as an elementary example in any arbitrary background. We, then compute the first three Seeley-DeWitt coefficient…
Imaging through fog using quadrature lock-in discrimination
Shashank Kumar, Bapan Debnath, Meena M. S. +5
We report experiments conducted in the field in the presence of fog, that were aimed at imaging under poor visibility. By means of intensity modulation at the source and two-dimens…
On the limits of agency in agent-based models
Ayush Chopra, Shashank Kumar, Nurullah Giray-Kuru +2
Agent-based modeling (ABM) offers powerful insights into complex systems, but its practical utility has been limited by computational constraints and simplistic agent behaviors, es…
Total Ionizing Dose Effects on CMOS Image Sensor for the ULTRASAT Space Mission
Vlad D. Berlea, Steven Worm, Nirmal Kaipachery +7
ULTRASAT (ULtraviolet TRansient Astronomy SATellite) is a wide-angle space telescope that will perform deep time-resolved surveys in the near-ultraviolet spectrum. ULTRASAT is a sp…
High-resolution spectroscopy of a single nitrogen-vacancy defect at zero magnetic field
Shashank Kumar, Pralekh Dubey, Sudhan Bhadade +3
We report a study of high-resolution microwave spectroscopy of nitrogen-vacancy centers in diamond crystals at and around zero magnetic field. We observe characteristic splitting a…
Enhancing Domain-Specific Retrieval-Augmented Generation: Synthetic Data Generation and Evaluation using Reasoning Models
Aryan Jadon, Avinash Patil, Shashank Kumar
Retrieval-Augmented Generation (RAG) systems face significant performance gaps when applied to technical domains requiring precise information extraction from complex documents. Cu…
Charmonium decay widths in magnetized matter
Amruta Mishra, Amal Jahan CS, Shivam Kesarwani +3
We study the partial decay widths of the charmonium states (, , , , ) to ( or ) in isospin asymmetric n…
Broadband femtosecond lasers enable efficient two-photon excitation of the ultranarrow linewidth singlet 1s2s state in helium
Shashank Kumar, Justin D. Piel, Chris H. Greene +1
We propose a broadband, femtosecond two-photon excitation scheme for efficient population transfer to the ultra-narrow linewidth metastable state in helium. Using $12…
The scientific payload of the Ultraviolet Transient Astronomy Satellite (ULTRASAT)
Sagi Ben-Ami, Yossi Shvartzvald, Eli Waxman +45
The Ultraviolet Transient Astronomy Satellite (ULTRASAT) is a space-borne near UV telescope with an unprecedented large field of view (200 sq. deg.). The mission, led by the Weizma…
Global Message Ordering using Distributed Kafka Clusters
Shashank Kumar, Aryan Jadon, Sachin Sharma
In contemporary distributed systems, logs are produced at an astounding rate, generating terabytes of data within mere seconds. These logs, containing pivotal details like system m…
Molecular Axis Distribution Moments in Ultrafast Transient Absorption Spectroscopy: A Path Towards Ultrafast Quantum State Tomography
Shashank Kumar, Eric Liu, Liang Z. Tan +2
In ultrafast experiments with gas phase molecules, the alignment of the molecular axis relative to the polarization of the interacting laser pulses plays a crucial role in determin…
Development of NavIC synchronized fully automated inter-building QKD framework and demonstration of quantum secured video calling
Adarsh Jain, Abhishek Khanna, Jay Bhatt +4
Quantum key distribution (QKD) is a revolutionary communication technology that promises ultimate security assurance by exploiting the fundamental principles of quantum mechanics.…
Phase-correlation-free quantum key distribution source operating at gigahertz rates
Shashank Kumar, Alessandro Marcomini, Loïc Millet +8
Phase randomization is essential for the security of practical decoy-state quantum key distribution (QKD) systems. Commonly, implementations rely on laser sources which are either…
Preliminary results of the Single Event Effect testing for the ULTRASAT sensors
Vlad Dumitru Berlea, Arooj Asif, Merlin F. Barschke +18
ULTRASAT (ULtra-violet TRansient Astronomy SATellite) is a wide-angle space telescope that will perform a deep time-resolved all-sky survey in the near-ultraviolet (NUV) spectrum.…
Leveraging Generative AI Models for Synthetic Data Generation in Healthcare: Balancing Research and Privacy
Aryan Jadon, Shashank Kumar
The widespread adoption of electronic health records and digital healthcare data has created a demand for data-driven insights to enhance patient outcomes, diagnostics, and treatme…
Attosecond Control of Squeezed Light
Russell Zimmerman, Shashank Kumar, Shiva Kant Tiwari +8
Squeezed light has revolutionized quantum metrology by enhancing interferometry for sensitive applications such as the detection of gravitational waves. Squeezed light has also pla…