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Quantum Control of Atom-Photon Entanglement via Structure Light in a Three-Level Medium

Ali Mehdinejad

International Journal of Theoretical PhysicsJun 1, 202220 citations

Controlling entanglement in quantum optics

Anton Zeilinger, Herbert Joseph Bernstein, Daniel M. Greenberger +2 more

Jan 1, 19937 citations

Multipartite classically entangled scalar beams

Zhensong Wan, Yijie Shen, Qiang Liu +1 more

Classically entangled light is used to refer to a class of structured beams with space-polarization, polarization-time, and space-time non-separable states akin to entangled states, which enable novel quantum-analog methods and applications in structured light. Here, we argue that classical entanglement is also available for pure scalar beams with multiple non-separable spatial degrees of freedom (DoFs). We theoretically and experimentally demonstrate a class of scalar ray-wave structured light with multiple controllable local DoFs to emulate multipartite entangled states, including the Greenberger-Horne-Zeilinger states. Our work unveils a rich parameter space for high-dimensional and multi-DoF control of structured light to extend applications in classical-quantum regimes.Classically entangled light is used to refer to a class of structured beams with space-polarization, polarization-time, and space-time non-separable states akin to entangled states, which enable novel quantum-analog methods and applications in structured light. Here, we argue that classical entanglement is also available for pure scalar beams with multiple non-separable spatial degrees of freedom (DoFs). We theoretically and experimentally demonstrate a class of scalar ray-wave structured light with multiple controllable local DoFs to emulate multipartite entangled states, including the Greenberger-Horne-Zeilinger states. Our work unveils a rich parameter space for high-dimensional and multi-DoF control of structured light to extend applications in classical-quantum regimes.

Optics LettersMar 8, 202216 citations

The optical quantum entanglement experiments

F. J. Duarte

Institute of Physics eBooksSep 1, 20220 citations

Quantum controlled cluster states in an optical parametric oscillator with a structured light pump

Rafael F. Barros, G. B. Alves, Olivier Pfister +1 more

We investigate the multipartite entanglement between spatial and spectral modes of an optical parametric oscillator pumped with a structured light field. When the pump beam is prepared in a second-order transverse mode, we show that the down-converted signal and idler fields are generated in a reconfigurable quadripartite entangled state of first-order modes. Our investigation is based both on separability criteria and a thorough analysis of the squeezing properties. Additionally, we demonstrate that large-scale entangled states can be produced and easily controlled by a pump field structured in both spatial and spectral domains. Our results pave the way for versatile cluster state engineering with structured light modes.We investigate the multipartite entanglement between spatial and spectral modes of an optical parametric oscillator pumped with a structured light field. When the pump beam is prepared in a second-order transverse mode, we show that the down-converted signal and idler fields are generated in a reconfigurable quadripartite entangled state of first-order modes. Our investigation is based both on separability criteria and a thorough analysis of the squeezing properties. Additionally, we demonstrate that large-scale entangled states can be produced and easily controlled by a pump field structured in both spatial and spectral domains. Our results pave the way for versatile cluster state engineering with structured light modes.

Dec 30, 20200 citations

Quantum structured light in high dimensions

Isaac M. Nape, Bereneice Sephton, Pedro Ornelas +2 more

Structured light has become topical of late, where controlling light in all its degrees of freedom has offered novel states of light long predicted, enhanced functionality in applications, and a modern toolbox for probing fundamental science. Structuring light as single photons and entangled states allows the spatial modes of light to be used to encode a large alphabet, accessing high dimensional Hilbert spaces for fundamental tests of quantum mechanics and improved quantum information processing tasks. In this tutorial, we outline the basic concepts of high dimensional quantum states expressed in a basis of spatial modes (structured light) and explain how to create, control, and detect such quantum states in the laboratory with a focus on transverse spatial modes such as the orbital angular momentum and pixel (position) modes. Finally, we highlight some example applications of such quantum structured light, from communications to imaging.Structured light has become topical of late, where controlling light in all its degrees of freedom has offered novel states of light long predicted, enhanced functionality in applications, and a modern toolbox for probing fundamental science. Structuring light as single photons and entangled states allows the spatial modes of light to be used to encode a large alphabet, accessing high dimensional Hilbert spaces for fundamental tests of quantum mechanics and improved quantum information processing tasks. In this tutorial, we outline the basic concepts of high dimensional quantum states expressed in a basis of spatial modes (structured light) and explain how to create, control, and detect such quantum states in the laboratory with a focus on transverse spatial modes such as the orbital angular momentum and pixel (position) modes. Finally, we highlight some example applications of such quantum structured light, from communications to imaging.

APL PhotonicsMay 1, 2023103 citations

Controlling quantum entanglement with structured light

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