Entanglement of Polarization and Orbital Angular Momentum

Abstract

We investigate two-photon entangled states using two important degrees of freedom of the electromagnetic field, namely orbital angular momentum (OAM) and spin angular momentum. For photons propagating in the same direction we apply the idea of $\text{entanglement duality}$ and develop schemes to do $\text{entanglement sorting}$ based either on OAM or polarization. In each case the entanglement is tested using appropriate witnesses. We finally present generalizations of these ideas to three- and four-photon entangled states.

arXiv comment6 pages, 3 figures

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• Faithful entanglement purification for high-capacity quantum communication with two-photon four-qubit systems
• Tripartite entanglement: Foundations and applications
• Self-error-corrected hyperparallel photonic quantum computation working with both the polarization and the spatial-mode degrees of freedom
• Shifting physics of vortex particles to higher energies via quantum entanglement
• Information processing at the speed of light
• Error-heralded generation and self-assisted complete analysis of two-photon hyperentangled Bell states assisted by single-sided quantum-dot-cavity systems
• Self-error-rejecting photonic qubit transmission in polarization-spatial modes with linear optical elements
• Remote preparation for single-photon state in two degrees of freedom with hyper-entangled states
• Spin in Compton scattering with pronounced polarization dynamics
• Bell measurements as a witness of a dualism in entanglement
• Duality in entanglement of macroscopic states of light
• How to observe duality in entanglement of two distinguishable particles?
• Single-particle steering and nonlocality: The consecutive Stern-Gerlach Experiments
• Maximum Violation of Monogamy of Entanglement for Indistinguishable Particles by Measures that are Monogamous for Distinguishable Particles
• Polarization-orbital angular momentum duality assisted entanglement observation for indistinguishable photons