A SPDC-Based Source of Entangled Photons and its Characterization

This paper is devoted to the simulation of a single-mode ion-exchange waveguide and the 3dB directional coupler for quantum chips. We performed diffusion modeling of Na + ↔ K + ions in the R 2 O−SnO 2 −SiO 2 glass and optical modeling by the beam propagation method. A wavelength of 1064 nm was used corresponding to the requirements of the single-mode regime for our waveguide. Simulation of diffusion has shown that the profile of the refractive index of overlapping areas can be modeled by summing two separate profiles, which is crucial for optimizing performance. In the process of optical modeling it was possible to minimize losses on s-bends of changing the width of the bend and reducing the interaction length to zero. So we looked at many aspects of device optimization and performed a design, manufacture and characteristics simulation of a directional 3dB coupler. The overall transmittance of proposed device was evaluated as 0.96.

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“…5). This wavelength corresponds to an SPDC bi-photons source [12] and also fits the requirements of a single-mode regime for our waveguide.…”

Section: Optical Modelingsupporting

confidence: 59%

Numerical modeling of ion exchange waveguide for the tasks of quantum computations

Gerasimenko¹,

Герасименко²,

Kiselev³

et al. 2019

Nanosystems: Phys. Chem. Math.

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“…[28]. 2 The atmosphere is transparent [28] and there exist sources of entangled photon pairs [32], at this wavelength. Furthermore, by a proper rescaling the turbulence strength and the propagation parameters our results can be generalized to other wavelengths.…”

Section: Multiple Phase Screen Methodsmentioning

confidence: 99%

Protecting the entanglement of twisted photons by adaptive optics

et al. 2018

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We study the efficiency of adaptive optics (AO) correction for the free-space propagation of entangled photonic orbital-angular-momentum (OAM) qubit states, to reverse moderate atmospheric turbulence distortions. We show that AO can significantly reduce crosstalk to modes within and outside the encoding subspace and thereby stabilize entanglement against turbulence. This method establishes a reliable quantum channel for OAM photons in turbulence, and enhances the threshold turbulence strength for secure quantum communication at least by a factor two.

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“…It was omitted in this considerations for simplicity. 5 ditto 6 Three dimension qudits are called: qutrits Using more non-linear units and crossing theirs output as was described above, one can 254 construct the setups for more components. The detection of temporal correlation of 4 and more photons in two polarization states.…”

mentioning

confidence: 99%

High precision voltage measurement for optical quantum computation

Wereszczyński¹,

Michalczuk²,

Paszkuta³

et al. 2022

Preprint

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We communicate the theoretical results in the study of utilizing the quantum phenomena in optical current for quantum computation in the context of high precision voltage measurements. These results can be used around computation by quantum sampling and quantum communication as the basis for further research and physical implementations. We propose a Main Optical Setup (MOS) for such computation which allows to make a superstructure to implement specific computations and algorithms. To create MOS we used the nonlinear units (e.g., beta- barium borate crystal), arranged in series, powered with pulsed laser pump, and ended with the beam splitter to generate the output state of a number of entangled photon pairs. The computation is made by propagation of entanglement with beam splitters applied crossword and adjustable phase shifters that are tools for parameter steering. We show how to implement the series of cosine-based components on the example of two-component case. The results opens a broad area for future research in the area of building quantum optimizer using the quantum sampling methods and in the area of high precision temporal measurement of voltage, which is the important process for building high-fidelity devices.

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A SPDC-Based Source of Entangled Photons and its Characterization

Cited by 34 publications

References 75 publications

Numerical modeling of ion exchange waveguide for the tasks of quantum computations

Numerical modeling of ion exchange waveguide for the tasks of quantum computations

Protecting the entanglement of twisted photons by adaptive optics

High precision voltage measurement for optical quantum computation

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