Publications (64)
Temperature dependent maximization of work and efficiency in a degeneracy assisted quantum Stirling heat engine
Sarbani Chatterjee, Arghadip Koner, Sohini Chatterjee +1
We propose a quantum Stirling heat engine with an ensemble of harmonic oscillators as the working medium. We show that the efficiency of the harmonic oscillator quantum Stirling he…
Efficient Object Detection Model for Real-Time UAV Applications
Subrahmanyam Vaddi, Chandan Kumar, Ali Jannesari
Unmanned Aerial Vehicles (UAVs) especially drones, equipped with vision techniques have become very popular in recent years, with their extensive use in wide range of applications.…
Comparing on-off detector and single photon detector in photon subtraction based continuous variable quantum teleportation
Chandan Kumar, Karunesh K. Mishra, Sibasish Ghosh
We consider here two distinct photon detectors namely, single photon detector and on-off detector, to implement photon subtraction on a two-mode squeezed vacuum (TMSV) state. The t…
Enhanced phase estimation in parity detection based Mach-Zehnder interferometer using non-Gaussian two-mode squeezed thermal input state
Chandan Kumar, Rishabh, Shikhar Arora
While the quantum metrological advantages of performing non-Gaussian operations on two-mode squeezed vacuum (TMSV) states have been extensively explored, similar studies in the con…
Husimi phase distribution in non-Gaussian operations
Ramniwas Meena, Chandan Kumar, Subhashish Banerjee
The Husimi phase distribution, an experimentally measurable quantity, is investigated for single-mode and two-mode squeezed vacuum states. The analysis highlights that non-Gaussian…
Electron-Hole Asymmetry in the Electron-phonon Coupling in Top-gated Phosphorene Transistor
Biswanath Chakraborty, Satyendra Nath Gupta, Anjali Singh +6
Using in-situ Raman scattering from phosphorene channel in an electrochemically top-gated field effect transistor, we show that its phonons with A symmetry depend much more str…
Advantage of probabilistic non-Gaussian operations in the distillation of single mode squeezed vacuum state
Chandan Kumar
We consider the distillation of squeezing in single mode squeezed vacuum state using three different probabilistic non-Gaussian operations: photon subtraction (PS), photon addition…
Imaging Hydrodynamic Electrons Flowing Without Landauer-Sharvin Resistance
Chandan Kumar, John Birkbeck, Joseph A. Sulpizio +8
Electrical resistance usually originates from lattice imperfections. However, even a perfect lattice has a fundamental resistance limit, given by the Landauer conductance caused by…
Provisioning Time-Based Subscription in NDN: A Secure and Efficient Access Control Scheme
Nazatul H. Sultan, Chandan Kumar, Saurab Dulal +3
This paper proposes a novel encryption-based access control mechanism for Named Data Networking (NDN). The scheme allows data producers to share their content in encrypted form bef…
Bayesian Optimization -- Multi-Armed Bandit Problem
Abhilash Nandy, Chandan Kumar, Deepak Mewada +1
In this report, we survey Bayesian Optimization methods focussed on the Multi-Armed Bandit Problem. We take the help of the paper "Portfolio Allocation for Bayesian Optimization".…
Localization physics in graphene Moire superlattices
Chandan Kumar, Saurabh Kumar Srivastav, Priyo Adhikary +3
Non-trivial Berry phase of graphene leads to unusual quantum correction to the conductivity. Berry phase of pi in single layer graphene (SLG) and 2pi in bi-layer graphene (BLG) is…
Evolution of two-mode quantum states under a dissipative environment: which quantum resource survives better, squeezing or entanglement?
Rishabh, Chandan Kumar, Geetu Narang +1
We explore the relative robustness of squeezing and entanglement (which are quantum resources interconvertible via passive optics) for two-mode Gaussian states under different diss…
Equilibration of Quantum hall edges in symmetry broken bilayer graphene
Chandan Kumar, Saurabh Kumar Srivastav, Anindya Das
Equilibration of quantum Hall edges is studied in a high quality dual gated bilayer graphene device in both unipolar and bipolar regime when all the degeneracies of the zero energy…
Quantum-enhanced quantum Monte Carlo: an industrial view
Maximilian Amsler, Peter Deglmann, Matthias Degroote +10
In this work, we test a recently developed method to enhance classical auxiliary-field quantum Monte Carlo (AFQMC) calculations with quantum computers against examples from chemist…
Continuous variable quantum teleportation using photon subtracted and photon added two mode squeezed coherent state
Shikhar Arora, Chandan Kumar, Arvind
We consider non-Gaussian states generated by photon subtraction (PS) and photon addition (PA) on two-mode squeezed coherent (TMSC) states, as resource states for continuous variabl…
Multiphoton Bell-type inequality: a tool to unearth nonlocality of continuous variable quantum optical systems
Chandan Kumar, Gaurav Saxena, Arvind
We consider a multiphoton Bell-type inequality to study nonlocality in four-mode continuous variable systems, which goes beyond two-photon states and can be applied to mixed as wel…
Exceptional point in a PT symmetric non-Hermitian terahertz plasmonic metasurface
Anshul Bhardwaj, Maidul Islam, Chandan Kumar +2
In this paper, we experimentally demonstrate a non-Hermitian open PT-symmetric terahertz metasurface comprising complementary plasmonic structures capable of exhibiting an exceptio…
Analyzing the Impact of Cognitive Load in Evaluating Gaze-based Typing
Korok Sengupta, Jun Sun, Raphael Menges +2
Gaze-based virtual keyboards provide an effective interface for text entry by eye movements. The efficiency and usability of these keyboards have traditionally been evaluated with…
Optimization of state parameters in displacement assisted photon subtracted measurement-device-independent quantum key distribution
Chandan Kumar, Sarbani Chatterjee, Arvind
Non-Gaussian operations, in particular, photon subtraction (PS), have been shown to enhance the performance of various quantum information processing tasks including continuous var…
Estimation of Wigner distribution of single mode Gaussian states: a comparative study
Chandan Kumar, Arvind
In this work, we consider the estimation of single mode Gaussian states using four different measurement schemes namely: i) homodyne measurement, ii) sequential measurement, iii) A…
Tree Tensor Networks Methods for Efficient Calculation of Molecular Vibrational Spectra
Shuo Sun, Richard M. Milbradt, Stefan Knecht +2
The paper introduces Tree Tensor Networks for calculating molecular vibrational spectra, testing various tree architectures and eigensolvers on high‑dimensional oscillator models a…
A two-coil mutual inductance technique to study matching effect in disordered NbN thin films
Sanjeev Kumar, Chandan Kumar, John Jesudasan +3
Although matching effects in superconducting anti-dot arrays have been studied extensively through magneto-resistance oscillations, these investigations have been restricted to a v…
Optimal characterization of Gaussian channels using photon-number-resolving detectors
Chandan Kumar, Ritabrata Sengupta, Arvind
We present optimal schemes, based on photon number measurements, for Gaussian state tomography and for Gaussian process tomography. An -mode Gaussian state is completely specifi…
Platinum-based Catalysts for Oxygen Reduction Reaction simulated with a Quantum Computer
Cono Di Paola, Evgeny Plekhanov, Michal Krompiec +7
Hydrogen has emerged as a promising energy source, holding the key to achieve low-carbon and sustainable mobility. However, its applications are still limited by modest conversion…
Parity-detection-based Mach-Zehnder interferometry with coherent and non-Gaussian squeezed vacuum states as inputs
Chandan Kumar, Rishabh, Mohak Sharma +1
We theoretically explore the advantages rendered by non-Gaussian operations in phase estimation using a parity-detection-based Mach-Zehnder interferometer, with one input being a c…
Re-examination of the role of displacement and photon catalysis operation in continuous variable measurement device-independent quantum key distribution
Chandan Kumar, Arvind
We investigate the benefits of using -photon catalysed two-mode squeezed coherent (-PCTMSC) state in continuous variable measurement device-independent quantum key distributi…
Microscale bending plasticity and fracture behavior of amorphous aluminum oxide films
Nidhin George Mathews, Erkka J. Frankberg, Vivek Devulapalli +12
Recent work has demonstrated microscale compressive plasticity in pulse laser deposited (PLD) amorphous alumina (a-Al2O3). This work explores microscale bending plasticity and frac…
Learn and Search: An Elegant Technique for Object Lookup using Contrastive Learning
Chandan Kumar, Jansel Herrera-Gerena, John Just +2
The rapid proliferation of digital content and the ever-growing need for precise object recognition and segmentation have driven the advancement of cutting-edge techniques in the f…
Equilibration of quantum hall edge states and its conductance fluctuations in graphene p-n junctions
Chandan Kumar, Manabendra Kuiri, Anindya Das
We report an observation of conductance fuctuations (CFs) in the bipolar regime of quantum hall (QH) plateaus in graphene (p-n-p/n-p-n) devices. The CFs in the bipolar regime are s…
Effects of elastic heterogeneity and anisotropy on the morphology of self-assembled epitaxial quantum dots
Chandan Kumar, Lawrence H. Friedman
Epitaxial self-assembled quantum dots (SAQDs) are of both technological and fundamental interest, but their reliable manufacture still presents a technical challenge. To better und…
Stage Aware Diagnosis of Diabetic Retinopathy via Ordinal Regression
Saksham Kumar, D Sridhar Aditya, T Likhil Kumar +3
Diabetic Retinopathy (DR) has emerged as a major cause of preventable blindness in recent times. With timely screening and intervention, the condition can be prevented from causing…
Quantitative agreement between experiment and theory for Vibrational Circular Dichroism enhanced by electronically excited states
Mariia Sapova, Chandan Kumar, Sahar Ashtari-Jafari +2
Intensity enhancement in vibrational circular dichroism (VCD) arises in open-shell transition metal complexes from coupling between ground-state vibrational transitions and magneti…
Continuous variable quantum teleportation, invariant squeezing and non-Gaussian resource states
Mohak Sharma, Chandan Kumar, Shikhar Arora +1
We investigate the role of quadrature squeezing in the quantum teleportation protocol for coherent states, using non-Gaussian resource states. For the two-mode systems, the non-Gau…
Origin of electrical noise near charge neutrality in dual gated graphene device
Aaryan Mehra, Roshan Jesus Mathew, Chandan Kumar
This letter investigates low frequency 1/ f noise in hBN encapsulated graphene device in a dual gated geometry. The noise study is performed as a function of top gate carrier densi…
Continuous variable quantum teleportation in a dissipative environment: Comparison of non-Gaussian operations before and after noisy channel
Chandan Kumar, Mohak Sharma, Shikhar Arora
We explore the relative advantages in continuous-variable quantum teleportation when non-Gaussian operations, namely, photon subtraction, addition, and catalysis, are performed bef…
Probing Phonon Modes in Reconstructed twisted Homo and Hetero Bilayer System
Sushil Kumar Sahu, Robin Bajaj, Syed Ummair Ali +7
Twist angle engineering in van der Waals homo and hetero-bilayers introduces profound modifications in their electronic, optical and mechanical properties due to lattice reconstruc…
Unsupervised learning based object detection using Contrastive Learning
Chandan Kumar, Jansel Herrera-Gerena, John Just +2
Training image-based object detectors presents formidable challenges, as it entails not only the complexities of object detection but also the added intricacies of precisely locali…
Supervised Multilabel Image Classification Using Residual Networks with Probabilistic Reasoning
Lokender Singh, Saksham Kumar, Chandan Kumar
Multilabel image categorization has drawn interest recently because of its numerous computer vision applications. The proposed work introduces a novel method for classifying multil…
SAFAARI: Schema-Aware Framework for Accelerated Advertiser Response Intelligence
Bhanu Teja Rangaraju, Chandan Kumar
The evolution of customer support systems is rapidly advancing with agentic chatbots, yet these systems face significant limitations when accessing enterprise data without predefin…
Origin of Matching Effect in Anti-dot Array of Superconducting NbN Thin Films
Sanjeev Kumar, Chandan Kumar, John Jesudasan +4
We investigate the origin of matching effect observed in disordered superconducting NbN thin films with periodic array of holes. In addition to the periodic variation in the electr…
Shear-Layer Perturbation Responses from Time-Resolved Schlieren Data
Spencer L. Stahl, Chandan Kumar, Datta V. Gaitonde
A novel combination of physics-based and data-driven post-processing techniques is proposed to extract acoustic-related shear-layer perturbation responses directly from spatio-temp…
Realistic non-Gaussian operations scheme in parity detection based Mach-Zehnder quantum interferometry
Chandan Kumar, Rishabh, Shikhar Arora
We theoretically analyze phase sensitivity using parity detection based Mach Zehnder interferometer (MZI) with the input states generated by performing non-Gaussian operations, viz…
Classical and quantum cost of measurement strategies for quantum-enhanced auxiliary field Quantum Monte Carlo
Matthew Kiser, Anna Schroeder, Gian-Luca R. Anselmetti +4
Quantum-enhanced auxiliary field quantum Monte Carlo (QC-AFQMC) uses output from a quantum computer to increase the accuracy of its classical counterpart. The algorithm requires th…
Probing 2D Black Phosphorus by Quantum Capacitance Measurements
Manabendra Kuiri, Chandan Kumar, Biswanath Chakraborty +5
Two-dimensional materials and their heterostructures have emerged as a new class of materials for not only fundamental physics but also for electronic and optoelectronic applicatio…
DeiTFake: Deepfake Detection Model using DeiT Multi-Stage Training
Saksham Kumar, Ashish Singh, Srinivasarao Thota +2
Deepfakes are major threats to the integrity of digital media. We propose DeiTFake, a DeiT-based transformer and a novel two-stage progressive training strategy with increasing aug…
Quantum Computing for Automotive Applications
Carlos A. RiofrÃo, Johannes Klepsch, Jernej Rudi Finžgar +7
Quantum computing could impact various industries, with the automotive industry with many computational challenges, from optimizing supply chains and manufacturing to vehicle engin…
Optimal non-Gaussian operations in difference-intensity detection and parity detection-based Mach-Zehnder interferometer
Manali Verma, Chandan Kumar, Karunesh K. Mishra +1
We investigate the benefits of probabilistic non-Gaussian operations in phase estimation using difference-intensity and parity detection-based Mach-Zehnder interferometers (MZI). W…
Evaluating Ground State Energies of Chemical Systems with Low-Depth Quantum Circuits and High Accuracy
Shuo Sun, Chandan Kumar, Kevin Shen +2
Solving electronic structure problems is considered one of the most promising applications of quantum computing. However, due to limitations imposed by the coherence time of qubits…
Consideration of success probability and performance optimization in non-Gaussian continuous variable quantum teleportation
Chandan Kumar, Shikhar Arora
Non-Gaussian operations have been shown to enhance the fidelity of continuous variable quantum teleportation. However, a disadvantage of these non-Gaussian operations is that they…
Coherence assisted non-Gaussian measurement device independent quantum key distribution
Chandan Kumar, Jaskaran Singh, Soumyakanti Bose +1
Non-Gaussian operations on two mode squeezed vacuum states (TMSV) in continuous variable measurement device independent quantum key distribution (CV-MDI-QKD) protocols have been sh…
Non-Gaussian two mode squeezed thermal states in continuous variable quantum teleportation
Chandan Kumar
While photon catalyzed two mode squeezed vacuum state has been considered in context of quantum teleportation, similar studies have not been yet conducted for photon catalyzed two-…
Interplay of filling fraction and coherence in symmetry broken graphene p-n junction
Arup Kumar Paul, Manas Ranjan Sahu, Chandan Kumar +3
The coherence of quantum Hall (QH) edges play the deciding factor in demonstrating an electron interferometer, which has potential to realize a topological qubit. A Graphene p-n ju…
On-demand quantum key distribution using superconducting rings with a mesoscopic Josephson junction
Chandan Kumar, Jaskaran Singh, Arvind
We present a quantum key distribution (QKD) protocol based on long lived coherent states prepared on superconducting rings with a mesoscopic Josephson junction (dc-SQUIDs). This en…
Pragmatic Comparison Analysis of Alternative Option Pricing Models
Natasha Latif, Shafqat Ali Shad, Muhammad Usman +5
In this paper, we price European Call three different option pricing models, where the volatility is dynamically changing i.e. non constant. In stochastic volatility (SV) models fo…
Pattern Based Multivariable Regression using Deep Learning (PBMR-DP)
Jiztom Kavalakkatt Francis, Chandan Kumar, Jansel Herrera-Gerena +2
We propose a deep learning methodology for multivariate regression that is based on pattern recognition that triggers fast learning over sensor data. We used a conversion of sensor…
Magnetic Charge State Controlled Spin-Wave Dynamics in Nanoscale Three-Dimensional Artificial Spin Ice
Chandan Kumar, Amrit Kumar Mondal, Sreya Pal +6
Three-dimensional (3D) magnetic nanostructures offer a versatile platform for exploring complex spin textures and spin-wave (SW) dynamics, with implications in next-generation spin…
No real advantage of photon subtraction and displacement in continuous variable measurement device independent quantum key distribution
Chandan Kumar, Sarbani Chatterjee, Arvind
We critically analyse the role of single photon subtraction (SPS) and displacement in improving the performance of continuous variable measurement device independent quantum key di…
Characterisation of Front-End Electronics of ChaSTE experiment onboard Chandayaan-3 lander
K. Durga Prasad, Chandan Kumar, Sanjeev K. Mishra +5
Chandra Surface Thermophysical Experiment (ChaSTE) is one of the payloads flown onboard the Chandrayaan-3 lander. The objective of the experiment is in-situ investigation of therma…
HDRVideo-GAN: Deep Generative HDR Video Reconstruction
Mrinal Anand, Nidhin Harilal, Chandan Kumar +1
High dynamic range (HDR) videos provide a more visually realistic experience than the standard low dynamic range (LDR) videos. Despite having significant progress in HDR imaging, i…
Effect of boron nitride defects and charge inhomogeneity on 1/f noise in encapsulated graphene
Chandan Kumar, Anindya Das
Low frequency 1/f noise is investigated in graphene, encapsulated between hexagonal boron nitride (hBN) substrate in dual gated geometry. The overall noise magnitude is smaller as…
Benchmarking Long Roll-outs of Auto-regressive Neural Operators for the Compressible Navier-Stokes Equations with Conserved Quantity Correction
Sean Current, Chandan Kumar, Datta Gaitonde +1
Deep learning has been proposed as an efficient alternative for the numerical approximation of PDE solutions, offering fast, iterative simulation of PDEs through the approximation…
Quantum non-Gaussian high Fock states of light pulses and their superpositions
G. P. Teja, Chandan Kumar, Lukáš Lachman +1
The generation of high Fock states of light pulses and their superpositions with provable quantum non-Gaussian features is still very challenging, although the power of conditional…
Spread and erase -- How electron hydrodynamics can eliminate the Landauer-Sharvin resistance
Ady Stern, Thomas Scaffidi, Oren Reuven +3
It has long been realized that even a perfectly clean electronic system harbors a Landauer-Sharvin resistance, inversely proportional to the number of its conduction channels. This…
Exploring AI in Steganography and Steganalysis: Trends, Clusters, and Sustainable Development Potential
Aditya Kumar Sahu, Chandan Kumar, Saksham Kumar +1
Steganography and steganalysis are strongly related subjects of information security. Over the past decade, many powerful and efficient artificial intelligence (AI) - driven techni…