Quantum Entanglement of Neutrino Pairs

TL;DR

This paper demonstrates that neutrino pairs from tau decay can form entangled states, violating Bell inequalities and enabling potential long-distance quantum cryptography within Earth's scale.

Contribution

It provides the first practical demonstration and theoretical analysis of neutrino pair entanglement and its applications in quantum communication.

Findings

Neutrino pairs from tau decay can be flavor entangled.

Bell inequality violations are feasible within Earth's scale.

Neutrino entanglement can be used for long-distance quantum cryptography.

Abstract

It is practically shown that a pair of neutrinos from tau decay can form a flavor entangled state. With this kind of state we show that the locality constrains imposed by Bell inequality are violated by the quantum mechanics, and an experimental test of this effect is feasible within the earth's length scale. Theoretically, the quantum entanglement of neutrino pairs can be employed to the use of long distance cryptography distribution in a protocol similar to the BB84.