23
collaborators
2020–2026
years active
Contributions
QIP QCrypt TQC talk poster presenter award · △program ◇steering ○organizing · filled = chair
8 Posters
| Title | Conference | Co-authors |
|---|---|---|
| Applications of the Quantum Phase Difference Estimation Algorithm to the Excitation Energies in Spin Systems on Classical and a Noisy Intermediate Scale Quantum Computers | QIP 2026 | ▸Boni Paul, Sudhindu Bikash Mandal, Bhanu Pratap Das |
| Robust phase estimation of the ground-state energy without controlled time evolution on a quantum device | QIP 2026 | ▸Hiroki Kuji, Yuta Shingu, Tetsuro Nikuni, Takashi Imoto, Yuichiro Matsuzaki |
| Direct Energy Gap Calculations in Heisenberg Spin Systems Using Superconducting Quantum Devices | TQC 2026 | Boni Paul, Sudhindu Bikash Mandal, Bhanu Pratap Das |
Accurate calculation of spin-state energy gaps is central to spin chemistry. The novel Quantum Phase Difference Estimation (QPDE) algorithm enables direct computation of energy gaps on a quantum computer. However, the required quantum circuits are typically too deep for noisy intermediate-scale quantum (NISQ) devices. In this study, as an initial step toward practical calculations for strongly correlated molecular multi-spin systems,we applied QPDE to two- and three-spin Heisenberg Hamiltonians with various geometries and coupling strengths, including symmetric, asymmetric, spin-frustrated and non-frustrated configurations. We found that the quantum circuit for the time-evolution operator achieves constant depth due to its matchgate-like structure, making it well-suited for NISQ implementation. Proof-of-principle hardware demonstrations using an IBM quantum processor yielded 85–93% accuracy in determining spin-state energy gaps. |
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| Violation of the size consistency condition in quantum phase estimation and VQE with the unitary coupled cluster ansatz | QIP 2025 | — |
| Enhancing the Harrow-Hassidim-Lloyd (HHL) algorithm in systems with large condition numbers | TQC 2025 | Peniel Bertrand Tsemo, Akshaya Jayashankar, Nishanth Baskaran, Sayan Chakraborty |
| Applications of the Quantum Phase Difference Estimation Algorithm to the Excitation Energies in Spin Systems on Classical and a Noisy Intermediate Scale Quantum Computers | TQC 2025 | Boni Paul, Sudhindu Bikash Mandal, Bhanu Pratap Das |
| Bayesian quantum phase difference estimation simulations for the direct calculation of fine structure splitting | QIP 2024 | V. S. Prasannaa, Satoshi Ohshima, Takahiro Katagiri, Yuji Mochizuki, Bijaya Kumar Sahoo, B. P. Das |
| Quantum chemistry of open shell molecules on quantum computers: Development of the quantum algorithm for the determination of the spin quantum number of arbitrary wave functions | QIP 2020 | Shigeaki Nakazawa, Kazuo Toyota, Kazunobu Sato, Daisuke Shiomi, Takeji Takui |
Collaborators
| Co-author | Joint talks |
|---|---|
| Bhanu Pratap Das | 3 |
| Boni Paul | 3 |
| Sudhindu Bikash Mandal | 3 |
| Akshaya Jayashankar | 1 |
| B. P. Das | 1 |
| Bijaya Kumar Sahoo | 1 |
| Daisuke Shiomi | 1 |
| Hiroki Kuji | 1 |
| Kazunobu Sato | 1 |
| Kazuo Toyota | 1 |
| Nishanth Baskaran | 1 |
| Peniel Bertrand Tsemo | 1 |
| Satoshi Ohshima | 1 |
| Sayan Chakraborty | 1 |
| Shigeaki Nakazawa | 1 |
| Takahiro Katagiri | 1 |
| Takashi Imoto | 1 |
| Takeji Takui | 1 |
| Tetsuro Nikuni | 1 |
| V. S. Prasannaa | 1 |