Okinawa Institute of Science and Technology (OIST)

Okinawa Institute of Science and Technology, Japan

Duration: November 2023 - November 2024
Affiliation: Applied Cryptography Unit, Complexity Sciences Unit
Mentor: Prof. Carlos Cid

Overview

OIST is a world-class international research institute in Okinawa, Japan, dedicated to advancing science and technology through multidisciplinary research. My postdoctoral appointment at OIST provided an opportunity to conduct cutting-edge research on advanced quantum cryptography and distillation protocols in a globally competitive environment.

Research Focus

During my postdoctoral tenure, I conducted research on:

• Quantum Distillation Protocols: Developed novel threshold-based quantum distillation techniques optimizing resource efficiency
• Device-Independent Quantum Communication: Advanced security proofs under non-Markovian channel effects
• Quantum Network Security: Analysis of sequential attacks in device-independent QKD scenarios
• Post-Quantum Cryptographic Interfaces: Hybrid approaches combining quantum and classical security

Key Publications from OIST

1. Threshold (Q, P) Quantum Distillation

• Gupta, S., Munro, W.J., Cid, C. (2024). arXiv:2408.15274
• Presented at Quantum Innovation (Tokyo, 2024), SPIE Optics + Photonics (San Diego, 2024)
• Novel distillation protocol with improved resource efficiency for quantum networks

2. Device-Independent QSDC Under Non-Markovian Channels

• Roy, P., Bera, S., Gupta, S., Majumdar, A.S. (2024). Quantum Information Processing 23, 170
• Security analysis of device-independent protocols in realistic quantum channels

3. Sequential Attack Analysis in Device-Independent QKD

• Roy, P., Sasmal, S., Bera, S., Gupta, S., Roy, A., Majumdar, A.S. (2024). arXiv:2411.16822
• Vulnerability analysis and countermeasures for sequential measurement attacks

Collaborators at OIST

• Prof. Carlos Cid (Primary Mentor): Advanced cryptography and quantum security
• Prof. William John Munro (NTT Basic Research): Quantum information and network protocols
• Prof. Ulf Dieckmann (Complexity Sciences and Evolution Unit): Dynamics of complex adaptive systems

Research Infrastructure

OIST provides state-of-the-art research facilities including:

• High-performance computing clusters for quantum simulation
• Collaborative research environment with international scientists
• Access to advanced quantum information libraries and tools (QuTiP, Qiskit, etc.)

Activities & Engagement

Teaching & Mentorship

• Teaching Assistant for graduate courses (Jan-Apr 2024) on quantum cryptography and applied mathematics
• Mentored research students on quantum protocols and security analysis

Research Community

• Participation in OIST’s Applied Cryptography Unit seminars and colloquia
• Collaboration with international quantum information researchers

International Network

Through OIST, I established research connections with leading quantum cryptography and information groups globally, strengthening my position at the forefront of quantum security research.

Contact & Resources

• Website: https://www.oist.jp
• Applied Cryptography Unit: https://groups.oist.jp/acu
• Location: 1919-1 Tancha, Onna-son, Okinawa 904-0495, Japan

OIST provided a transformative international research experience, enabling advancement of quantum cryptography research through collaboration with leading global scientists.