Heralded Generation of Vectorially Structured Photons With a High Purity

Wu, Huayue; Yu, Benli; Zhu, Zhi‐Han; Rosales‐Guzmán, Carmelo; Zhou, Zhiyuan; Ding, Dong-Sheng; Gao, Wei; Shi, Bao‐Sen

doi:10.3389/fphy.2021.654451

Cited by 5 publications

(2 citation statements)

References 32 publications

(40 reference statements)

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“…Then, the two spatial light modulations (SLM) combined with two Fourier lenses constructed a digital holography system that we used for generation and characterization spatial modes. Specifically, SLM-1 first converted the signal photons into the target modes, such as those patterns shown in figure 3, through complex-amplitude modulation [16,50]. In addition, a digitalpropagation phase mask was multiplexed on the hologram of complex-amplitude modulation to control the equivalent propagation distance of generated modes arriving at the surface of SLM-2, i.e.…”

Section: Methods and Resultsmentioning

confidence: 99%

Propagation-invariant high-dimensional orbital angular momentum states

Mao¹,

Ding²,

Rosales‐Guzmán³

et al. 2022

J. Opt.

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Photonic states encoded in spatial modes of paraxial light fields provide a promising platform for high-dimensional quantum information protocols and related studies, where several pioneering theoretical and experimental demonstrations have paved the path for future technologies. Crucially, critical issues encountered in free-space propagation still represent a major challenge. This is the case of asynchronous diffraction between spatial modes with different modal orders, which experience variations in their transverse structure upon free-space propagation. Here we address this issue by proposing an encoding method based on the use of Laguerre-Gaussian (LG) modes of the same modal order N to define a N + 1 dimensional space. Noteworthy, such modes endowed with orbital angular momentum (OAM) experience the same propagation aberrations featuring an identical Gouy phase and wavefront curvature. We demonstrate our proposal experimentally by using time-correlated-single-photon imaging combined with a digital propagation technique. Importantly, our technique allows to eliminate, without the use of imaging systems, all issues related to asynchronous diffraction, providing an accessible way to generate propagation-invariant OAM qudits for quantum optical protocols.

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Section: Methods and Resultsmentioning

confidence: 99%

Propagation-invariant high-dimensional orbital angular momentum states

Mao¹,

Ding²,

Rosales‐Guzmán³

et al. 2022

J. Opt.

Self Cite

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show abstract

“…On the other hand, SLMs are currently being used to advance generation methods for structured light fields across numerous disciplines, i.e. for classical laser beams [27], single photon fields [28], and for controlling up-conversion and down-conversion processes in nonlinear crystals (NCs) [29,30]. In quantum entanglement experiments, SLMs are a main tool for most spatial mode entanglement experiments, spanning a wide range of transverse spatial modes, e.g.…”

Section: Introductionmentioning

confidence: 99%

An all-digital approach for versatile hybrid entanglement generation

Nape¹,

Oliveira²,

Slabbert³

et al. 2022

J. Opt.

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Hybrid entangled states present non-local correlations between photons with independent degrees of freedom and are currently gaining much interest. In particular, hybrid entanglement between polarisation and spatial modes of two photons are promising candidates for future heterogeneous quantum channels, but their versatility is limited by current generation methods that rely on static elements. Here, we present a technique that exploits polarisation and spatial mode dependent phase modulation in an all-digital approach using spatial light modulators. We show that we can tailor hybrid entangled states using spatial modes with Cylindrical and Cartesian symmetry, making our approach flexible, dynamic, and adaptable.

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Gouy-phase-mediated propagation variations and revivals of transverse structure in vectorially structured light

Zhong

Zhu

et al. 2021

Phys. Rev. A

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Exploring physics and potential applications in vectorially structured light with propagation-invariant transverse structures has benefited many areas of modern optics and photonics. In this paper, we focus on non-eigen vector modes of paraxial light fields, and systemically investigate propagation variations and revivals of their transverse structures, including both amplitude and polarization profiles. We show that the deeper mechanism behind the evolution of the transverse structure is the variations and revivals of intramodal phases within spin-orbit coupled space and spatial-mode subspace, which originates from fractional Gouy phases, or rather, Geometric-phase difference between spatial modes under a same unitary transformation. This underlying principle, provides a general guideline for shaping vectorially structured light with custom propagation-evolution properties, and may also inspire many other new applications based on structured light.

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Heralded Generation of Vectorially Structured Photons With a High Purity

Cited by 5 publications

References 32 publications

Propagation-invariant high-dimensional orbital angular momentum states

Propagation-invariant high-dimensional orbital angular momentum states

An all-digital approach for versatile hybrid entanglement generation

Gouy-phase-mediated propagation variations and revivals of transverse structure in vectorially structured light

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