3
collaborators
2025–2026
years active
Contributions
QIP QCrypt TQC talk poster presenter award · △program ◇steering ○organizing · filled = chair
3 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, Kenji Sugisaki, Bhanu Pratap Das |
| Direct Energy Gap Calculations in Heisenberg Spin Systems Using Superconducting Quantum Devices | TQC 2026 | Boni Paul, Kenji Sugisaki, 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. |
||
| 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, Kenji Sugisaki, Bhanu Pratap Das |
Collaborators
| Co-author | Joint talks |
|---|---|
| Bhanu Pratap Das | 3 |
| Boni Paul | 3 |
| Kenji Sugisaki | 3 |