TY  - JOUR
PB  - SciPost Foundation
DO  - 10.21468/SciPostPhysCore.6.2.028
TI  - Device-independent and semi-device-independent entanglement certification in broadcast Bell scenarios
PY  - 2023/04/11
UR  - https://www.scipost.org/SciPostPhysCore.6.2.028
JF  - SciPost Physics Core
JA  - SciPost Phys. Core
VL  - 6
IS  - 2
SP  - 028
A1  - Boghiu, Emanuel-Cristian
AU  - Hirsch, Flavien
AU  - Lin, Pei-Sheng
AU  - Quintino, Marco Túlio
AU  - Bowles, Joseph
AB  - It has recently been shown that by broadcasting the subsystems of a bipartite quantum state, one can activate Bell nonlocality and significantly improve noise tolerance bounds for device-independent entanglement certification. In this work we strengthen these results and explore new aspects of this phenomenon. First, we prove new results related to the activation of Bell nonlocality. We construct Bell inequalities tailored to the broadcast scenario, and show how broadcasting can lead to even stronger notions of Bell nonlocality activation. In particular, we exploit these ideas to show that bipartite states admitting a local hidden-variable model for general measurements can lead to genuine tripartite nonlocal correlations. We then study device-independent entanglement certification in the broadcast scenario, and show through semidefinite programming techniques that device-independent entanglement certification is possible for the two-qubit Werner state in essentially the entire range of entanglement. Finally, we extend the concept of EPR steering to the broadcast scenario, and present novel examples of activation of the two-qubit isotropic state. Our results pave the way for broadcast-based device-independent and semi-device-independent protocols.
ER  -

@Article{10.21468/SciPostPhysCore.6.2.028,
	title={{Device-independent and semi-device-independent entanglement certification in broadcast Bell scenarios}},
	author={Emanuel-Cristian Boghiu and Flavien Hirsch and Pei-Sheng Lin and Marco Túlio Quintino and Joseph Bowles},
	journal={SciPost Phys. Core},
	volume={6},
	pages={028},
	year={2023},
	publisher={SciPost},
	doi={10.21468/SciPostPhysCore.6.2.028},
	url={https://scipost.org/10.21468/SciPostPhysCore.6.2.028},
}