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Hybrid Integration for Single Photon Generation

Thomas Meany, Lutfi Arif Ngah, Matthew J. Collins, Alex S. Clark, Robert J. Williams, Benjamin J. Eggleton, Michael J. Steel, Michael J. Withford, Olivier Alibart, Sébastien Tanzilli

Published Jun 24, 2014• 0 citations
OpenAlex

Abstract

A key resource for quantum optics experiments is an on-demand source of single and multiple photon states at telecommunication wavelengths. This letter presents a her- alded single photon source based on a hybrid technology approach, combining high efficiency periodically poled lithium niobate waveguides, low-loss laser inscribed circuits, and fast (>1 MHz) fibre coupled electro-optic switches. Hybrid inter- facing different platforms is a promising route to exploiting the advantages of existing technology and has permitted the demonstration of the multiplexing of four identical sources of single photons to one output. Since this is an integrated tech- nology, it provides scalability and can immediately leverage any improvements in transmission, detection and photon production efficiencies.

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A key resource for quantum optics experiments is an on-demand source of single and multiple photon states at telecommunication wavelengths. This letter presents a her- alded single photon source based on a hybrid technology approach, combining high efficiency periodically poled lithium niobate waveguides, low-loss laser inscribed circuits, and fast (>1 MHz) fibre coupled electro-optic switches. Hybrid inter- facing different platforms is a promising route to exploiting the advantages of existing technology and has permitted the demonstration of the multiplexing of four identical sources of single photons to one output. Since this is an integrated tech- nology, it provides scalability and can immediately leverage any improvements in transmission, detection and photon production efficiencies.
Abstract A key resource for quantum optics experiments is an on‐demand source of single and multiple photon states at telecommunication wavelengths. This letter presents a heralded single photon source based on a hybrid technology approach, combining high efficiency periodically poled lithium niobate waveguides, low‐loss laser inscribed circuits, and fast (>1 MHz) fibre coupled electro‐optic switches. Hybrid interfacing different platforms is a promising route to exploiting the advantages of existing technology and has permitted the demonstration of the multiplexing of four identical sources of single photons to one output. Since this is an integrated technology, it provides scalability and can immediately leverage any improvements in transmission, detection and photon production efficiencies.
We discuss the hybrid integration of multiple components for the production of telecom band single photon sources. We implement four, on-chip, waveguide channels capable of producing four spatially separated collinear pairs of single photons. Using laser inscribed waveguide circuits and point-by-point bre Bragg gratings (FBG), we interface, separate and lter generated photon pairs. We propose using fast switches to actively route multiple heralded single photons to a single output producing an enhanced rate while maintaining a xed noise level.
Abstract Efficient generation of single photons is one of the key challenges of building photonic quantum technology, such as quantum computers and long-distance quantum networks. Photon source multiplexing—where successful pair generation is heralded by the detection of one of the photons, and its partner is routed to a single mode output—has long been known to offer a concrete solution, with output probability tending toward unity as loss is reduced. Here, we present a temporally multiplexed integrated single photon source based on a silicon waveguide and a low-loss fibre switch and loop architecture, which achieves enhancement of the single photon output probability of 4.5 ± 0.5, while retaining g (2)(0) = 0.01.
Reliable generation of single photons is of key importance for fundamental physical experiments and quantum protocols.The periodically poled lithium niobate (LN) waveguide has shown promise for an integrated quantum source due to its large spectral tunability and high efficiency, benefiting from the quasi-phase-matching.Here we demonstrate photon-pair sources based on an LN waveguide periodically poled by a tightly focused femtosecond laser beam.The pair coincidence rate reaches ∼8000 counts per second for average pump power of 3.2 mW (peak power is 2.9 kW).Our results prove the possibility of application of the nonlinear photonics structure fabricated by femtosecond laser to the integrated quantum source.This method can be extended to three-dimensional domain structures, which provide a potential platform for steering the spatial degree of freedom of the entangled two-photon states.
The current challenge of quantum photonic is to realize integrated circuits that monolithically combines light sources, optical modulators, storage units, and light detectors. Lithium niobate (LN) waveguides has emerged as one of the key platforms of photonics quantum technologies [1]. Due to mature technology of waveguide fabrication, efficient properties for light control and compatibility with the existing telecommunication infrastructure, LN is at the heart of many quantum components (light sources, modulators, coherent wavelength converters and quantum memories). Superconducting single-photon detector (SSPD) is relatively simple architecture for the realisation in a waveguide configuration and has been demonstrated on several technological platforms [2]. It is based on the principle of photoninduced hot-spot formation in ultranarrow superconducting NbN wires and can provide high sensitivity at telecommunication wavelengths near 1550 nm, high counting rates, broad spectral response, and high temporal resolution due to low jitter values. The LN SSPD has been also considered [3], however only theoretical estimations have been made for waveguide configuration.