Year: 2018
Type: article
Abstract: In quantum cryptography, device-independent (DI) protocols can be certified secure without requiring assumptions about the inner workings of the devices used to perform the protocol. In order to display nonlocality, which is an essential feature in DI protocols, the device must consist of at least two separate components sharing entanglement. This raises a fundamental question: how much entanglement is needed to run such DI protocols? We present a two-device protocol for DI random number generation (DIRNG) which produces approximately n bits of randomness starting from n pairs of arbitrarily weakly entangled qubits. We also consider a variant of the protocol where m singlet states are diluted into n partially entangled states before performing the first protocol, and show that the number m of singlet states need only scale sublinearly with the number n of random bits produced. Operationally, this leads to a DIRNG protocol between distant laboratories that requires only a sublinear amount of quantum communication to prepare the devices.
Source: Quantum
Authors: Cédric Bamps, Serge Massar, Stefano Pironio
Institution: Université Libre de Bruxelles
Language: English
Subfield: Atomic and Molecular Physics, and Optics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $215
Awards: G1292136229, G216641431, G82789103, G87989046
OpenAlex ID: W2605827825