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A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference

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Creating and probing multipartite macroscopic entanglement with light.

M Paternostro¹, D Vitali, S Gigan

¹School of Mathematics and Physics, Queen's University, Belfast BT7 1NN, United Kingdom.

Physical Review Letters

|February 1, 2008

Summary

We demonstrate a practical method to generate multipartite entanglement using radiation pressure in a cavity system. This quantum entanglement, involving a massive object, is detectable through field correlations, even when the object is inaccessible.

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Area of Science:

Quantum Physics
Cavity Quantum Electrodynamics
Quantum Information Science

Background:

Multipartite entanglement is crucial for quantum information processing.
Cavity systems with movable mirrors are promising platforms for quantum phenomena.
Observing entanglement with inaccessible massive objects remains a challenge.

Purpose of the Study:

To propose a scheme for generating multipartite entanglement in a cavity system.
To demonstrate how entanglement with an inaccessible massive object can be detected.
To provide an operative method for inferring quantum behavior in partially accessible systems.

Main Methods:

Utilizing radiation pressure to induce entanglement.
Analyzing field-field quantum correlations to unravel entanglement.
Modeling a cavity system with a movable mirror.

Main Results:

Successfully showed signatures of multipartite entanglement generation.
Demonstrated that entanglement persists under a wide range of conditions.
Established a method to detect entanglement involving an inaccessible massive object.

Conclusions:

The proposed scheme is immediately realizable.
Field correlations provide a viable route to observe entanglement with inaccessible components.
This work offers a practical approach to studying quantum behavior in complex systems.