VISHWA VIGYAN LABS
Small scales.
Big questions.
Our first research arm connects theoretical physics, computation and experimental engineering. Each project begins with a concrete question, a model or an instrument.
What can local quantum
quantities tell us about time?
At mesoscopic scales, interference changes the way electrons move. The group investigates the connections between local density of states, scattering, transport, measurement and time.
The published work studies negative local partial density of states in systems with Fano resonances and the associated coherent-current response. Current work explores an LPDOS-based interpretation of Landauer conductance and mesoscopic measurement.
The authors interpret negative LPDOS in terms of negative time. Direct experimental tests of that interpretation and broader time-travel claims remain open. We welcome alternative explanations and independent scrutiny.
Questions we are pursuing
- Can a three-probe geometry give a direct measurement of negative LPDOS?
- Which observables distinguish a negative-time interpretation from scattering-delay accounts?
- What testable predictions follow from the proposed Landauer reinterpretation?
When boundaries
change everything.
Non-Hermitian quantum systems reveal unusual relationships between motion, localization and topology. We investigate SSH and AAH chains through analytical and computational models.
Skin effect and quasiperiodic localization
How nonreciprocal hopping and quasiperiodic structure compete to shape localization in the non-Hermitian SSH chain.
Read the preprintTopology in generalized SSH/AAH chains
Exploring topological phases and localization under generalized Aubry–André–Harper modulation.
Read the preprintA quantum-battery resource?
The quantum-battery project examines passive ergotropy and how charging protocols interact with skin-localized states. The current manuscript explores charger geometry, topology and disorder robustness.
From a quantum device
to a measurable signal.
Graphene-based Josephson devices meet three-dimensional microwave cavities in Souvik’s experimental work on superconducting quantum hardware.
Device
Graphene / hBN
Hybrid Josephson junctions
Environment
3D microwave cavities
Cryogenic preparation
Measurement
Spectroscopy
Time-domain characterization
Current work involves a gate- and flux-tunable graphene gatemon, cavity and qubit spectroscopy, avoided crossings, dispersive shifts, spurious modes and time-domain measurement workflows.
This research is carried out at Souvik’s home institution. Authorship, intellectual property and publication decisions remain with the institutional research team.
Andreev transport with quasiperiodic control
Analytical and numerical study of tunable Andreev reflection in a metal–superconductor junction containing an Aubry–André–Harper spacer.
Purākaash Mk II.
Beyond the city lights.
An integrated deep-sky imaging system designed for automated, calibration-ready observing under bright urban skies.
Aplanatic optical train
Narrowband imaging
Cooled scientific detector
The instrument brings together precision guiding, plate solving, autofocus, environmental control and FITS acquisition. Its intended applications include nebular imaging, time-series photometry, minor-planet astrometry and public observing.
Project documentationSource-folder access may require the owner’s permission.
Room for the
next question.
Our wider network brings experience in materials modelling, perovskites, electrocatalysis, characterization and scientific communication.
Foundational questions about measurement, information and the quantum–classical boundary also guide exploratory discussion. These directions develop into projects as the questions, methods and teams become defined.