28 citations · 101 across the 15 of their papers we have counts for
15 papers
Enforcing IID structure on time-bin encoded QKD protocols via coarse-graining
Shlok Nahar, Shihong Pan, Norbert Lütkenhaus
Many security proofs for quantum key distribution (QKD) require Bob's measurement to have a tensor-product structure across protocol rounds, with some techniques requiring the stro…
A rigorous and complete security proof of decoy-state BB84 quantum key distribution
Devashish Tupkary, Shlok Nahar, Amir Arqand +2
We present a rigorous and complete security proof of the decoy-state BB84 quantum key distribution (QKD) protocol. Our analysis aims to achieve a high standard of mathematical rigo…
Authentication in Security Proofs for Quantum Key Distribution
Devashish Tupkary, Shlok Nahar, Ernest Y. -Z. Tan
Quantum Key Distribution (QKD) protocols rely on authenticated classical communication. Typical QKD security proofs are carried out in an idealized setting where authentication is…
Phase error estimation for passive detection setups with imperfections and memory effects
Zhiyao Wang, Devashish Tupkary, Shlok Nahar
We develop a generic framework to bound the phase error rate for quantum key distribution protocols using passive detection setups with imperfections and memory effects. This frame…
Incorporating device characterization into security proofs
Ernest Y. -Z. Tan, Shlok Nahar
Typical security proofs for quantum key distribution (QKD) rely on having some model for the devices, with the security guarantees implicitly relying on the values of various param…
Security of quantum key distribution with source and detector imperfections through phase-error estimation
Guillermo Currás-Lorenzo, Margarida Pereira, Shlok Nahar +1
Quantum key distribution promises information-theoretic security, but practical implementations face vulnerabilities due to device imperfections. Existing security proofs typically…
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…
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…
Phase error rate estimation in QKD with imperfect detectors
Devashish Tupkary, Shlok Nahar, Pulkit Sinha +1
We present a finite-size security proof of the decoy-state BB84 QKD protocol against coherent attacks, using entropic uncertainty relations, for imperfect detectors. We apply this…
Postselection technique for optical Quantum Key Distribution with improved de Finetti reductions
Shlok Nahar, Devashish Tupkary, Yuming Zhao +2
The postselection technique is an important proof technique for proving the security of quantum key distribution protocols against coherent attacks. In this work, we go through mul…
Oscillating photonic Bell state from a semiconductor quantum dot for quantum key distribution
Matteo Pennacchietti, Brady Cunard, Shlok Nahar +10
An on-demand source of bright entangled photon pairs is desirable for quantum key distribution (QKD) and quantum repeaters. The leading candidate to generate entangled photon pairs…
Imperfect Phase-Randomisation and Generalised Decoy-State Quantum Key Distribution
Shlok Nahar, Twesh Upadhyaya, Norbert Lütkenhaus
Decoy-state methods [1-3] are essential to perform quantum key distribution (QKD) at large distances in the absence of single photon sources. However, the standard techniques apply…
Security of quantum key distribution with imperfect phase randomisation
Guillermo Currás-Lorenzo, Shlok Nahar, Norbert Lütkenhaus +2
The performance of quantum key distribution (QKD) is severely limited by multiphoton emissions, due to the photon-number-splitting attack. The most efficient solution, the decoy-st…
Path integrals, spontaneous localisation, and the classical limit
Bhavya Bhatt, Manish Ram Chander, Raj Patil +3
We recall that in order to obtain the classical limit of quantum mechanics one needs to take the limit. In addition, one also needs an explanation for the abse…
Preparations and Weak Quantum Control can Witness non-Markovianity
Shlok Nahar, Sai Vinjanampathy
The dynamics of a system that is initially correlated with an environment is almost always non-Markovian. Hence it is important to characterise such initial correlations experiment…