Device-Independent Random Number Generation and Quantum Key Distribution with Weak Random Seeds

Professor Ramanathan, Ravishankar   (Principal Investigator (PI))

42

2021-01-01

2024-06-30

640139

Device-Independent Random Number Generation and Quantum Key Distribution with Weak Random Seeds

Quantum Cryptography, Quantum Foundations, Quantum Information Theory, Quantum Key Distribution, Random Number Generation

PhysicsComputer Science Fundamentals

Physical Sciences (P)

27210620

Early Career Scheme (ECS)

2020

Completed

1 Device-independent randomness amplification using arbitrary weak sources of randomness. [The objective is to formulate device-independent protocols to obtain secure, fully random bits starting from general public min-entropy sources, that may be correlated with the very devices used in the protocol.] 2 Increasing the rate of certified random and key bits in DI protocols with weak sources. [The objective is to increase the generation rates of random and key bits in device-independent protocols, by the use of high-dimensional quantum systems, addressing detection inefficiencies, and by means of novel sequential self-tests of quantum devices.] 3 Enhancing the security level of finite-data cryptography. [The objective is to investigate the security of device-independent protocols against general adversaries only limited by the principle of relativistic causality, to devise schemes for local randomness generation by users in untrusted networks, and to formulate security proofs for quantum cryptographic protocols beyond random number generation when using weak random seeds.] 4 Device-independent quantum key distribution using arbitrary weak initial randomness sources. [The objective is to formulate device-independent quantum key distribution protocols starting from weak random seeds, expanding the techniques from random number generation schemes, and to optimise key generation rates under the minimally relaxed assumptions of collective attacks and one-sided device-independence.]