One-step direct measurement of the entangled W states with cross-Kerr nonlinearity
Si-Le Lin, Chun-Lin Zhang, Si-Yang Hao, Pei-Yao Hong
TL;DR
This paper introduces a practical scheme using cross-Kerr nonlinearity to directly measure entangled W states of multiple photons in a single step, simplifying the process for experimental implementation.
Contribution
It presents a novel, one-step measurement scheme for multi-photon W states using only PBSs and cross-Kerr mediums, extending to N-photon states.
Findings
Feasible for experimental realization
Works for three, four, and N-photon W states
Simplifies measurement process
Abstract
We propose a scheme to directly measure the entangled W states with cross-Kerr nonlinearity mediums. This scheme can measure three-photon, four-photon, and even N-photon W states in one step. Only PBSs and cross-Kerr nonlinearity mediums are used in this scheme, which is feasible for experiments. We describe the three-photon W states measurement process and extend it to four-photon and N-photon W states.
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