Publication

Suppressing parasitic nonlinear processes in frequency-degenerate photon pairs emission in layer-poled TFLN waveguides

2025

Abstract

Suppression of noise photons from unwanted nonlinear processes is a major hurdle in generating frequency-degenerate correlated photon pairs for quantum information, e.g. continuous-variable quantum computing [1]. On-chip, telecom-pumped and frequency-degenerate photon pairs have been produced either using second harmonic generation (SHG) followed by spontaneous parametric down conversion (SPDC) in thin film lithium niobate (TFLN) waveguides [2], or by dual-pump spontaneous four-wave mixing (DP-SFWM) in microresonators [3,4]. However, the former needs careful filtering of the SHG pump, while the latter suffers from single-pump (SP-) SFWM contributions, which decrease the purity of the generated quantum states. SP-SFWM can be suppressed by linearly coupling resonators at the expense of reduced bandwidth [3] or efficiency [4].

Official source

https://infoscience.epfl.ch/entities/publication/2e1e4c25-ea13-473f-90b4-c30106eec52d

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2025

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/2e1e4c25-ea13-473f-90b4-c30106eec52d

About this result

Related concepts (32)

Quantum computing

A quantum computer is a computer that exploits quantum mechanical phenomena. At small scales, physical matter exhibits properties of both particles and waves, and quantum computing leverages this behavior, specifically quantum superposition and entanglement, using specialized hardware that supports the preparation and manipulation of quantum states. Classical physics cannot explain the operation of these quantum devices, and a scalable quantum computer could perform some calculations exponentially faster than any modern "classical" computer.

Quantum information

Quantum information is the information of the state of a quantum system. It is the basic entity of study in quantum information theory, and can be manipulated using quantum information processing techniques. Quantum information refers to both the technical definition in terms of Von Neumann entropy and the general computational term. It is an interdisciplinary field that involves quantum mechanics, computer science, information theory, philosophy and cryptography among other fields.

Spontaneous parametric down-conversion

Spontaneous parametric down-conversion (also known as SPDC, parametric fluorescence or parametric scattering) is a nonlinear instant optical process that converts one photon of higher energy (namely, a pump photon), into a pair of photons (namely, a signal photon, and an idler photon) of lower energy, in accordance with the law of conservation of energy and law of conservation of momentum. It is an important process in quantum optics, for the generation of entangled photon pairs, and of single photons.

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Suppressing parasitic nonlinear processes in frequency-degenerate photon pairs emission in layer-poled TFLN waveguides

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