Dr. Roopayan Ghosh
Assistant Professor
- SBS, Room no. 035
- roopayan@iitbbs.ac.in
- Department of Physics
Research Interests:
I am an Assistant Professor in Quantum Information and Technologies at the Indian Institute of Technology Bhubaneswar. I received my Ph.D. in Quantum Many-Body Theory from IACS, Kolkata mentored by Prof. Krishnendu Sengupta and subsequently held postdoctoral positions at the University of Ljubljana, Slovenia, and University College London, UK. My research lies at the intersection of quantum information science, many-body physics, and emerging quantum technologies. I work on quantum state preparation via adiabatic and non-adiabatic methods, quantum annealing, and quantum sensing, with a particular focus on exploiting many-body correlations and phase transitions for technological advantage. My recent work explores the dynamics of spin systems in arbitrary geometries and the enhancement of performance in quantum annealers through catalysts and customized embeddings, along with state characterization techniques for quantum simulation platforms.
In my teaching, I emphasize modern simulation and numerical methods, including tensor network approaches and code optimization to develop both conceptual understanding and practical intuition for quantum systems. Looking ahead, my broader research vision is to develop scalable frameworks for quantum state engineering and control in interacting systems, with applications ranging from quantum sensing and computation to transport phenomena in programmable quantum devices.
Quantum Physics -II
Physics Laboratory -I
Numerical techniques and Computational Physics
Condensed Matter Physics
| Spring 2026 | B.Sc. Thesis supervisor of Shakti Sagar Das on “Entanglement dynamics in Spin chains”. | |
| Winter 2025 | Supervisor of Winter project of Somdeep Mishra IISER Kolkata on “Quantum Causality via Quantum Liang Information”. | |
| Summer 2025 | Supervisor of B.Sc. summer project student Mi Lan at UCL on “Quantifying quantum causation of local measurements using Liang information”. | |
| Spring 2023 | Co-Supervisor of M.Sc. thesis of Anuj Gore in University College London, titled “Using machine learning to simplify entanglement detection via classical shadows”. | |
| Others | Co-supervised final PhD. Project of Bin Yi with his supervisor Sougato Bose at University College London, and currently co-supervising a PhD project of Henry Davenport with his supervisor Frank Schindler in Imperial College, London. |
| · Shyama Prasad Mukherjee (SPMF) fellow August 2015-July 2020.
· INSTITUTE SILVER MEDAL, IIT BOMBAY, for the student with best performance in M.Sc. Physics, IIT BOMBAY · PROF. R P SINGH MEMORIAL PRIZE, IIT BOMBAY, for best student among M.Sc./B. Tech. Eng. Physics, IIT BOMBAY · BHAVESH GANDHI MEMORIAL PRIZE, for best M.Sc. project, IIT BOMBAY · DR. RANJAN RAY MEMORIAL GOLD MEDAL, for best performance in B.Sc. Physics (Hons.), St. Xavier’s College (Autonomous), Kolkata. · Gold Medal in National Graduate Physics Examination (NGPE) for being in top 5 graduate students in India. |
· KVPY (Kishor Vaigyanik Protshahan Yojana) fellow 2009-2015
· Secured Rank 1 in UGC-CSIR-JRF-NET 2014. · Secured Rank 1 in IIT JAM 2013, Rank 2 in JEST 2013, 2015. · Secured Rank 2 in Zonal Electromagnetic Olympiad 2013, conducted by IEEE. · Ranked 2730 candidates in IITJEE 2010, and ranked 11 in WBJEE 2010. |
Interaction-Enhanced Quantum Sensing in Rydberg Atom Arrays, for the 2026 Quantum Computing Access @ NERSC (QCAN).
- “Enhancement of quantum annealing via -local catalysts”, R Ghosh, LA Nutricati, N Feinstein, PA Warburton, S Bose, Physical Review Research 8 (1), 013301 (2026).
- “Enhancing the Energy Gap of Random Graph Problems via XX-catalysts in Quantum Annealing”, LA Nutricati, R Ghosh, N Feinstein, S Bose, PA Warburton, Quantum Science and technology 10 045010 (2025).
- “Re-entrant localization induced by short-range hopping in the fractal Rosenzweig-Porter Model”, R Ghosh, M Sarkar, I M Khaymovich Physical Review B 111 (22), L220102 (2025).
- *“Exponentially enhanced quantum sensing with many-body phase transitions”, S Sarkar, A Bayat, S Bose, R Ghosh Nature Communications 16 (1), 1-11 (2025).
- *“Quantum Liang Information Flow Probe of Causality Across Critical Points”, R Ghosh, Y Bin, S Bose, Physical Review Letters 134 (15), 150202 (2025).
- “Separability criterion using one observable for special states: Entanglement detection via quantum quench”, R Ghosh, S Bose, Physical Review Research 6 (2), 023132 (2024).
- “Tuning the phase diagram of a Rosenzweig-Porter model with fractal disorder”, M Sarkar, R Ghosh, IM Khaymovich Physical Review B 108 (6), L060203 (2023).
- * “Relaxation of imbalance in a disordered XX model with on-site dephasing”, R Ghosh, M Žnidarič, Physical Review B 107 (18), 184303 (2023).
- “Boundary chaos: Exact entanglement dynamics“, Fritzsch, Felix, Roopayan Ghosh, and Tomaž Prosen. SciPost Physics 15.3 (2023) 092.
- * “Resonance-induced growth of number entropy in strongly disordered systems”, R Ghosh, M Žnidarič, Physical Review B 105 (14), 144203 (2022).
| Mar 2026 | Geometry tuned Dynamical freezing in neutral atom arrays- APS Global summit, Denver Colorado. | |
| Nov 2025 | Enhancement of Quantum Annealing via n-local catalysts– International Network of Quantum Annealing conference, Barcelona, Spain (Invited) | |
| Oct 2025 | Quantum Liang Information Flow Probe of Causality across Critical Points– Workshop on Complex Quantum Matter, University of Evora, Portugal | |
| Mar 2025 | Exponential speed-up of quantum annealing via n-local catalysts– APS March Meeting, Anaheim, USA. | |
| June 2024 | n-local catalysts to speed up quantum annealing- AQC University of Strathclyde, Glasgow, United Kingdom | |
| Mar 2024 | Separability criterion using one observable for special states: Entanglement detection via quantum quench– APS March meeting, Minneapolis, USA. | |
| Jan 2024 | Relaxation of imbalance in a disordered XX model with on-site dephasing –
Stability Of Quantum Matter in And Out of Equilibrium at Various Scales, ICTS, Bangalore, India (Invited). |
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| Aug 2023 | Relaxation of imbalance in a disordered XX model with on-site dephasing–
Nonequilibrium Physics – Current Trends and Future Perspectives, Bad Honnef Physikzentrum, Germany. |
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| July 2023 | Separability criterion using one observable for special states: Entanglement detection via quantum quench–
Condensed Matter in the City, University College London, United Kingdom. |
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| March 2023 | Relaxation of imbalance in a disordered XX model with on-site dephasing –
APS March Meeting, Las Vegas, USA. |
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| March 2022 | Resonance-induced growth of number entropy in strongly disordered systems –
APS March Meeting, Chicago, USA. |
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| Sep 2020 | A Floquet perturbation theory for periodically driven weakly-interacting fermions-QMAT, India. | |
| Feb 2018 | Ramp and Periodic dynamics on systems with a non-Ising universality class – School and Conference on Driven Quantum Systems, IACS, Kolkata, India. |
| Research Fellow
Aug 2022 – Aug 2025 |
Dept. of Physics and Astronomy, University College London, United Kingdom
Projects- Non-ergodic quantum manipulation, Many-Body Phases In Continuous-Time Quantum Computation, Developing a Quantum Bus for germanium hole-based spin qubits on silicon. Supervisor: Sougato Bose |
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| Research Assistant with Doctorate
Apr 2021- Jul 2022 |
Dept. of Mathematics and Physics, University of Ljubljana, Slovenia
Project-Many-body transport engineering Supervisor: Marko Žnidarič |
| Refereeing |
| Active Referee for APS journals, PRL, PRX Quantum, PRB and PRE for more than 2 years and 20+ manuscripts, and active referee for Nature physics, IOP and Quantum journals. Guest editor of “Frontiers in Quantum science and Technology” journal. |
| Grants awarded |
| NERSC Startup Award 2024, 2026 to utilize Aquila quantum computer machine time in Quera, NQCC grant for computing time on IBM, Aquila and IonQ. |