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Detecting the steerability through an optimized steering criterion in two-photon systems.

Xiao-Gang Fan, Fa Zhao, Huan Yang

|May 9, 2023

Summary

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Researchers developed a new steering criterion to detect more steerable quantum states in two-photon systems. This optimized criterion, based on spin correlation, identifies the most steerable states efficiently.

Area of Science:

Quantum Information Science
Quantum Optics
Quantum Many-Body Systems

Background:

Quantum state steerability is a key indicator of non-classical correlations.
Linear steering inequalities suggest increased steerability with more measurements.
Detecting steerable states in two-photon systems is crucial for quantum information processing.

Purpose of the Study:

To theoretically derive an optimized steering criterion for arbitrary two-qubit states.
To experimentally validate the new criterion using Werner-like states in two-photon systems.
To compare the effectiveness of the new criterion against existing methods for detecting steerability.

Main Methods:

Theoretical derivation of an optimized steering criterion based on the spin correlation matrix.

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Experimental preparation and measurement of Werner-like states in a two-photon system.

Application of three distinct steering criteria to assess state steerability.

Main Results:

The derived steering criterion depends solely on the spin correlation matrix, eliminating the need for infinite measurements.
Experimental results demonstrate that the new steering criterion identifies the most steerable states under identical conditions.
The optimized criterion proves more effective in detecting steerable states compared to the three-measurement criterion and geometric Bell-like inequality.

Conclusions:

The developed steering criterion offers a more efficient method for detecting steerable quantum states.
This work provides a valuable tool and reference for advancing quantum state characterization.
The findings contribute to a deeper understanding of quantum correlations in two-photon systems.