Efficient Measurement of Multiparticle Entanglement with Embedding Quantum Simulator

TL;DR

This paper demonstrates a scalable method for directly measuring multiparticle entanglement using an embedding photonic quantum simulator, significantly reducing the measurement complexity for entanglement monotones.

Contribution

It introduces an efficient embedding framework for measuring N-qubit entanglement monotones with minimal local measurement settings, validated through experimental photonic simulations.

Findings

Successful measurement of multiparticle entanglement concurrence and three-tangle.

Efficient measurement requires only 2 or 6 local settings depending on N.

Experimental validation of entanglement dynamics in a multiphoton quantum simulator.

Abstract

We reports direct and scalable measurement of multiparticle entanglement concurrence and three-tangle with embedding photonic quantum simulators. In this embedding framework [Phys. Rev. Lett. 111, 240502 (2013)], $N$-qubit entanglement monotone, which associates with non-Hermitian operators, can be efficiently measured with only 2 (for even $N$) and 6 (for odd $N$) local measurement settings. Our experiment uses a multiphoton quantum simulator to mimic the dynamical entanglement evolution and track its concurrence and three-tangle.