Establish the reference.
Use statevector simulation where the problem fits, verify qubit ordering, and check the complete path from circuit execution to a valid submission.
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BlueQubit × DuQuantum 202624–25 October 2026
24-hour simulation challenge
Duke Quantum
Hackathon.
Take the classical side.
Estimate the quantum echo.
My participation in the OTOC estimation challenge: seven circuit problems, several simulation methods, and a limited compute budget.
Visit the hackathon ↗24 hevent duration
3 + 4open samples + hidden circuits
OTOCinformation-scrambling signal
The challenge
Estimate what becomes
hard to simulate.
Out-of-time-order correlators (OTOCs) track how quantum information spreads through a system. The hackathon asked participants to estimate these signals using classical simulation, with three downloadable sample circuits and four hidden circuits accessed through BlueQubit. Each circuit was scored separately against its reference values.
My approach
Choose the method for the circuit.
Trade memory for approximation.
Explore matrix-product-state simulation and refine bond dimensions where the available compute allows. Track convergence without treating agreement alone as proof of accuracy.
Estimate the observable.
Use Pauli-path estimates on harder cases and compare genuine estimates from different simulation methods, retaining the raw values and run settings.
Saved competition record
The recorded scores.
1,426 / 3,000
Full points on all three samples and G1. Approximate estimates contributed the remaining recorded points.
Snapshot: 25 October 2026, 11:54 SGT. These scores come from my saved submission ledger during the event; they are not a verified final standing or rank.
| Problem | Score | Method |
|---|---|---|
| S1 | 100 / 100 | Exact statevector |
| S2 | 100 / 100 | Exact statevector |
| S3 | 100 / 100 | Exact GPU simulation |
| G1 | 300 / 300 | Exact CPU/GPU simulation |
| G2 | 591 / 600 | Adaptive MPS estimates |
| G3 | 216 / 800 | MPS + Pauli-path estimates |
| G4 | 19 / 1000 | Pauli-path estimates |
Participation
A weekend of quantum simulation.
Certificate of Completion issued by BlueQubit to Monit Sharma for participating in the Duke Quantum Hackathon 2026, run in collaboration with DuQuantum.
Open the certificate PDF ↗
Duke Quantum Hackathon 2026 · Certificate of Completion
The certificate recognizes participation and effort in the event.
Event & evidence