Quantum secret sharing using pseudo-GHZ states

TL;DR

This paper demonstrates a quantum secret sharing protocol using pseudo-GHZ states derived from energy-time entanglement, enabling multi-qubit quantum communication despite lacking nonlocality tests.

Contribution

It introduces a novel setup for quantum secret sharing with pseudo-GHZ states, expanding practical quantum communication capabilities.

Findings

High coincidence count rates achieved

First application of multi-qubit quantum communication protocol

Pseudo-GHZ states exhibit quantum correlations without nonlocality tests

Abstract

We present a setup for quantum secret sharing using pseudo-GHZ states based on energy-time entanglement. In opposition to true GHZ states, our states do not enable GHZ-type tests of nonlocality, however, they bare the same quantum correlations. The relatively high coincidence count rates found in our setup enable for the first time an application of a quantum communication protocoll based on more than two qubits.