Complete conversion of KLM entanglement to GHZ entanglement with error-detected quantum devices

Abstract

Quantum entanglement plays a crucial role in quantum information technologies. In the paper, we propose several schemes to convert completely from Knill-Laflamme-Milburn (KLM) entangled states to Greenberger-Horne-Zeilinger (GHZ) states based on error-detected quantum devices (EDQDs), which employ the interaction between a quantum-dot-cavity (QD-cavity) system and a photon. Moreover, the quantum circuits of EDQDs applied in the conversion processes make our schemes carry out faithfully, as the practical photon-scattering deviations are changed into heralded-failure detections. Analyses show that these conversion cases have unity fidelities and high efficiencies, which encourage us to appreciate more deeply the fundamental properties of entanglement.

Complete analysis of hyperentangled Bell state in three degrees of freedom using Kerr effect and self-assisted mechanism

“…It should be noted that the generation of Kerr nonlinearities in optical microcavities and magnonic systems has also been investigated recently [63,64]. Moreover, the cavity-assisted interaction and quantum dot spin in an optical microcavity may also provide accessible ways to build the photon number QND we required [65][66][67][68][69][70][71].…”