12 papers
Experimental quantum cryptography with single photons and imperfect devices
Aodhán Corrigan, Koray Kaymazlar, Zhiyao Wang +9
Quantum key distribution (QKD) allows for provably secure key distribution between two trusted parties. Because the security and performance of QKD protocols rely on devices that b…
Semidefinite programming for understanding the limitations of Lindblad equations
Soumyadeep Sarma, Manas Kulkarni, Archak Purkayastha +1
Lindbladian quantum master equations (LEs) are the most popular descriptions for quantum systems weakly coupled to baths. But, recent works have established that in many situations…
Security proofs for practical QKD: variations, techniques, gaps, and limitations
Devashish Tupkary, Ernest Y. -Z. Tan, Shlok Nahar +2
We review the current status of security proofs for practical decoy-state Quantum Key Distribution using the BB84 protocol, focusing on optical implementations with weak coherent p…
Rigorous Security Proofs for Practical Quantum Key Distribution
Devashish Tupkary
This thesis is concerned with rigorous security analyses of practical Quantum Key Distribution (QKD) protocols, using a variety of modern proof techniques. The main results are as…
Imperfect detectors for adversarial tasks with applications to quantum key distribution
Shlok Nahar, Devashish Tupkary, Norbert Lütkenhaus
Security analyses in quantum key distribution (QKD) and other adversarial quantum tasks often assume perfect device models. However, real-world implementations often deviate from t…
A consolidated and accessible security proof for finite-size decoy-state quantum key distribution
Jerome Wiesemann, Jan Krause, Devashish Tupkary +3
In recent years, quantum key distribution (QKD) has evolved from a scientific research field to a commercially available security solution, supported by mathematically formulated s…