Explore

Small scales. Big questions.

Our own research, the papers and books that record it, and the instruments we have built. Every item is labelled for what it is: published, preprint, in progress, or an open question.

Research

What we are working on.

Each project has, or will have, its own page.

Mesoscopic Time Group · led by Prof. P. Singha Deo

Can a signal arrive before it is sent?

Inside a small enough quantum device, interference can make the time an electron takes to cross come out negative. The group has published a paper titled “Transmitting a signal in negative time”, and two books on the route from there to time travel.

The open question. The authors interpret negative local partial density of states 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.

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Theory and simulation

When boundaries change everything.

Non-Hermitian quantum systems reveal unusual relationships between motion, localization and topology. We study SSH and AAH chains through analytical and computational models: skin effects, quasiperiodicity, spectral topology and quantum thermodynamics.

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Consciousness research · Project Sat-Chit-Ananda

Can inner experience be tested?

A source-checked reconstruction of Sree Sree Thakur Anukulchandra’s account of consciousness, and six claims about practice and experience drawn from it that a laboratory can examine.

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Quantum AI · on the bench and on the desk

Building qubits. Building AI.

Superconducting qubits made and measured in the lab, and AI systems built and used every day. Play with a qubit, compare a transmon with a fluxonium, and read where both fields are heading. Laboratory findings are shared after publication and the relevant approvals.

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Research conducted at collaborators’ institutions remains subject to their confidentiality, authorship and publication requirements. Vishwa Vigyan does not own or operate those facilities.

Atlas · with Prof. P. Singha Deo

A model of the universe.

A joint exploration of how the universe is modelled: the big bang, curved spacetime, and what time really is. It is at an early stage: two working sketches, two prototype notebooks and a live picture of expansion.

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The questions underneath

Follow any of this far enough and you reach questions that are older than physics. We keep them in view as questions, not as results we claim.

  • Time
  • Matter
  • Life
  • Consciousness
  • AI
  • God
  • Meaning

In the lab

Where the cold work happens.

Souvik’s experimental work is on superconducting circuits, measured inside refrigerators that run close to absolute zero. These pictures are from the laboratory in Taiwan where he works.

  • Souvik Ghosh beside an open dilution refrigerator: gold-plated plates stacked one below another, hung with wiring and copper parts.
    A dilution refrigerator, opened for wiring. Each plate runs colder than the one above it. The opening of this site is modelled on a machine like this.
  • Four seconds at the cold end, and a shield going on. A silent clip from a Master Within reel.
  • Close-up of a gold-plated sample holder with fine red copper wires looped into a small multi-pin connector.
    Wiring a sample holder by hand: fine enamelled wire into a connector smaller than a fingernail.
  • A gloved hand holding a small gold-plated sample holder with two threaded connectors and loose fine wires.
    The finished holder, before it goes into the cold.

Vishwa Vigyan does not own or operate this laboratory. The pictures show equipment only; results stay unpublished until the papers are out.

Papers and books

Follow the work. Examine the evidence.

Papers, books and preprints by Prof. P. Singha Deo, Kanchan Meena and Souvik Ghosh, with their co-authors. Each one links to the publisher or to arXiv.

Time, and negative density of states

  1. Journal article · 2025Negative Local Partial Density of StatesKanchan Meena, Souvik Ghosh & P. S. DeoJournal of Condensed Matter · 3(1), 16–21 · DOI 10.61343/jcm.v3i01.113
  2. Preprint · 2025Reinterpreting Landauer conductance, solving the quantum measurement problem, grand unificationKanchan Meena, Souvik Ghosh & P. Singha DeoarXiv:2512.09709
  3. Conference paper · 2025Multiple manifestations of negative partial density of statesKanchan Meena & P. S. DeoAIP Conference Proceedings · 3266, 020159
  4. Book · 2024Time Travel: A Reality in Mesoscopic PhysicsP. Singha Deo & Kanchan MeenaSpringer
  5. Journal article · 2023Time reversed states in barrier tunnelingKanchan Meena & P. Singha DeoPhysica E · 149, 115680
  6. Book · 2021Mesoscopic Route to Time TravelProsenjit Singha DeoSpringer
  7. Journal article · 2019Transmitting a signal in negative timeP. Singha Deo & Urbashi SatpathiResults in Physics · 12, 1506–1512
  8. Journal article · 2016Negative partial density of states in mesoscopic systemsUrbashi Satpathi & P. Singha DeoAnnals of Physics · 375, 491–514
  9. Journal article · 2009The Friedel sum rule at Fano resonancesP. Singha DeoJournal of Physics: Condensed Matter · 21, 285303
  10. Public explainer · 2025“We May Have Built the First Step Toward Real Time Travel — And It’s Already Peer-Reviewed”Souvik Ghosh · 6 May 2025Medium. An introduction to the authors’ interpretation of their research; the papers and books are the technical record.

Non-Hermitian and topological systems

  1. Preprint · 2026Competing skin effect and quasiperiodic localization in the non-Hermitian SSH chainSouvik GhosharXiv:2603.20330
  2. Preprint · 2025Exploring Topological and Localization Phenomena in SSH Chains under Generalized AAH ModulationSouvik Ghosh & Sayak RoyarXiv:2506.10195
  3. Working manuscriptNon-Hermitian Skin Effect as a Quantum Battery Resource: Passive Ergotropy and Protocol-Dependent Charging in the SSH ChainSouvik Ghosh, Sayak Roy, Saurabh Mishra & Nituparna DasIn development

Earlier work by Prof. P. Singha Deo: a selection

  1. Journal article · 2020Current carried by evanescent modes and possible device applicationSreemoyee Mukherjee, P. Singha Deo & A. M. JayannavarPhysica E · 118, 113933
  2. Journal article · 2011Quantum capacitance: A microscopic derivationSreemoyee Mukherjee, M. Manninen & P. Singha DeoPhysica E · 44, 62–66
  3. Journal article · 2004Quantum rings for beginners: energy spectra and persistent currentsS. Viefers, P. Koskinen, P. Singha Deo & M. ManninenPhysica E · 21, 1–35
  4. Journal article · 2003Friedel sum rule for a single-channel quantum wireSwarnali Bandopadhyay & P. Singha DeoPhysical Review B · 68, 113301
  5. Journal article · 1998Vortex Phase Diagram for Mesoscopic Superconducting DisksV. A. Schweigert, F. M. Peeters & P. Singha DeoPhysical Review Letters · 81, 2783–2786
  6. Journal article · 1997Magnetization of Mesoscopic Superconducting DisksP. Singha Deo, V. A. Schweigert, F. M. Peeters & A. K. GeimPhysical Review Letters · 79, 4653–4656
  7. Journal article · 1994Quantum waveguide transport in serial stub and loop structuresP. Singha Deo & A. M. JayannavarPhysical Review B · 50, 11629–11639

This list is not complete. Much of our work is done inside universities and research institutes in several countries. That work carries their affiliation and is published under their name, so it is not listed here.

Telescopes

Purākaash Mk II. Beyond the city lights.

An integrated deep-sky imaging system, designed for automated, calibration-ready observing under bright urban skies. Commissioned in October 2025.

The Purākaash telescope on a rooftop in daylight, its cameras and cables attached, with Souvik Ghosh beside it holding the hand controller.
Purākaash Mk II on the roof, with its cameras and guide scope attached.

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