Enhancing the stimulated emission of polarization-entangled photons using passive optical components

Nozaki, Ryo; Sato, Yoshiro; Shimada, Yuji; Suzuki, Toshio; Yasuno, Kei; Ikai, Yuta; Ueda, Wataru; Shimizu, Kaito; Yukawa, Emi; Sanaka, Kaoru

doi:10.1103/physreva.107.023707

Cited by 3 publications

(1 citation statement)

References 27 publications

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“…Obviously, theoretical advances are being made as well; as an example, Nozaki et al have now (February 2023) published a paper where they propose to use a resonator with only passive optical components to scale up stimulated emission of polarization-entangled photon pairs [ 212 ]; they present only a proof-of-principle experimental demonstration with a double-pass polarization Sagnac interferometer and periodically poled KTP crystal, but use of waveguide structures should lead to realization of highly efficient and bright quantum-entangled photon sources needed for quantum information technologies.…”

Section: Discussionmentioning

confidence: 99%

An Introduction to Nonlinear Integrated Photonics: Structures and Devices

Sirleto

Righini

2023

Micromachines

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The combination of integrated optics technologies with nonlinear photonics, which has led to growth of nonlinear integrated photonics, has also opened the way to groundbreaking new devices and applications. In a companion paper also submitted for publication in this journal, we introduce the main physical processes involved in nonlinear photonics applications and discuss the fundaments of this research area. The applications, on the other hand, have been made possible by availability of suitable materials with high nonlinear coefficients and/or by design of guided-wave structures that can enhance a material’s nonlinear properties. A summary of the traditional and innovative nonlinear materials is presented there. Here, we discuss the fabrication processes and integration platforms, referring to semiconductors, glasses, lithium niobate, and two-dimensional materials. Various waveguide structures are presented. In addition, we report several examples of nonlinear photonic integrated devices to be employed in optical communications, all-optical signal processing and computing, or in quantum optics. We aimed at offering a broad overview, even if, certainly, not exhaustive. However, we hope that the overall work will provide guidance for newcomers to this field and some hints to interested researchers for more detailed investigation of the present and future development of this hot and rapidly growing field.

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Section: Discussionmentioning

confidence: 99%

An Introduction to Nonlinear Integrated Photonics: Structures and Devices

Sirleto

Righini

2023

Micromachines

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A White‐Box Digital Twin for Real‐Time Polarization Tracking

Zhang,

Pu,

et al. 2024

Laser & Photonics Reviews

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Tracking polarization in real‐time is a long‐term challenge. The conventional heuristic and gradient‐descent‐based algorithms for polarization tracking lack efficiency and interpretability. To resolve the problem, a white‐box digital twin modeling the entire polarization tracking system is derived by calculating with Stokes vectors and Mueller matrices. Moreover, the real‐time polarization tracking enabled by the white‐box digital twin is experimentally demonstrated, which is over 7 times faster than the commonly used stochastic parallel gradient descent (SPGD) on average. The adoption of digital twin allows the algorithm to bypass the loop of perturbation, sampling, and adjusting over the real system, thereby significantly reducing the sample times and recovery time. The proposed white‐box digital‐twin‐based algorithm has strong interpretability and high efficiency, which has substantial potential to become a standard approach to achieve real‐time polarization tracking.

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Single-photon generation from a neodymium ion in optical fiber at room temperature

Shimizu,

Inoue,

Katsumata

et al. 2024

Applied Physics Letters

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The realization of single-photon generation is important for implementing various quantum information technologies. The use of rare-earth ions in an optical fiber is a promising single-photon generation method due to its ability to operate at room temperature as well as the low cost involved. Neodymium ions are especially interesting because the ions are one of the most commercially affordable rare-earth materials in the current industry. The neodymium ion also has the advantage of having a rich energy level structure, which offers several possible wavelengths for emitted single photons from visible to near-telecommunication wavelengths. In this paper, we experimentally demonstrated single-photon generation using an isolated single neodymium ion in tapered silica fiber at room temperature. Our results have significant implications as a platform for low-cost wavelength-selectable single-photon sources and photonic quantum applications.

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Enhancing the stimulated emission of polarization-entangled photons using passive optical components

Cited by 3 publications

References 27 publications

An Introduction to Nonlinear Integrated Photonics: Structures and Devices

An Introduction to Nonlinear Integrated Photonics: Structures and Devices

A White‐Box Digital Twin for Real‐Time Polarization Tracking

Single-photon generation from a neodymium ion in optical fiber at room temperature

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