Feasible logic Bell-state analysis with linear optics

TL;DR

This paper presents a practical linear-optics protocol for logic Bell-state analysis using existing technology, enabling efficient identification of certain entangled states crucial for quantum computing.

Contribution

It introduces a feasible method employing polarization beam splitters and half-wave plates for logic Bell-state analysis with potential for generalization to arbitrary C-GHZ states.

Findings

Can identify two logic Bell states.

Protocol is compatible with current experimental technology.

Generalizable to arbitrary C-GHZ state analysis.

Abstract

We describe a feasible logic Bell-state analysis protocol by employing the logic entanglement to be the robust concatenated Greenberger-Horne-Zeilinger (C-GHZ) state. This protocol only uses polarization beam splitters and half-wave plates, which are available in current experimental technology. We can conveniently identify two of the logic Bell states. This protocol can be easily generalized to the arbitrary C-GHZ state analysis. We can also distinguish two $N$-logic-qubit C-GHZ states. As the previous theory and experiment both showed that the C-GHZ state has the robustness feature, this logic Bell-state analysis and C-GHZ state analysis may be essential for linear-optical quantum computation protocols whose building blocks are logic-qubit entangled state.