Gregory A. Howland
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View article: Heralded telecom single photons from a visible–telecom pair source on a hybrid PPKTP–PIC platform
Heralded telecom single photons from a visible–telecom pair source on a hybrid PPKTP–PIC platform Open
We present a heralded photon-pair source using periodically poled potassium titanyl phosphate (PPKTP) waveguides coupled with photonic integrated circuits (PICs). The PPKTP generates correlated visible–telecom photon pairs, processed by th…
View article: Microring resonator-based photonic circuit for faithfully heralding NOON states
Microring resonator-based photonic circuit for faithfully heralding NOON states Open
We have designed a Micro-Ring Resonator (MRR) based device that allows for the post-selection of high order NOON states via heralding. NOON states higher than $N=2$ cannot be generated deterministically. By tuning the coupling parameters o…
View article: Low-Crosstalk, Silicon-Fabricated Optical Waveguides for Laser Delivery to Matter Qubits
Low-Crosstalk, Silicon-Fabricated Optical Waveguides for Laser Delivery to Matter Qubits Open
Reliable control of quantum information in matter-based qubits requires precisely applied external fields, and unaccounted for spatial cross-talk of these fields between adjacent qubits leads to loss of fidelity. We report a CMOS foundry-p…
View article: Generating high-dimensional entanglement using a foundry-fabricated photonic integrated circuit
Generating high-dimensional entanglement using a foundry-fabricated photonic integrated circuit Open
We present a silicon photonic integrated circuit (PIC) designed to generate high-dimensional (HD) entanglement across four discrete waveguide path modes. Our PIC is foundry fabricated and fully packaged with electrical wirebonds and an epo…
View article: Nonlinear optics as a source of high-dimensional genuine tripartite entanglement
Nonlinear optics as a source of high-dimensional genuine tripartite entanglement Open
We lay down a general scheme to quantify the amount of genuine tripartite entanglement present in the spatial and energy-time degrees of freedom of entangled photon triplets using a resource-based measure known as the tripartite entangleme…
View article: Quantifying tripartite spatial and energy-time entanglement in nonlinear optics
Quantifying tripartite spatial and energy-time entanglement in nonlinear optics Open
In this work, we provide a means to quantify genuine tripartite entanglement\nin arbitrary (pure and mixed) continuous-variable states as measured by the\nTripartite Entanglement of formation -- a resource-based measure quantifying\ngenuin…
View article: Two-dimensional extreme skin depth engineering for CMOS photonics
Two-dimensional extreme skin depth engineering for CMOS photonics Open
Extreme skin depth engineering ( e-skid ) can be applied to integrated photonics to manipulate the evanescent field of a waveguide. Here we demonstrate that e-skid can be implemented in two directions in order to deterministically engineer…
View article: A modular laboratory curriculum for teaching integrated photonics to students with diverse backgrounds
A modular laboratory curriculum for teaching integrated photonics to students with diverse backgrounds Open
A modular laboratory curriculum with exercises for students and lesson plans for teachers is presented. Fundamentals of basic integrated photonic (IP) devices can be taught, first as a lecture-in-the-lab followed by "hands-on" laboratory m…
View article: Integrated photonics and application-specific design on a massive open online course platform
Integrated photonics and application-specific design on a massive open online course platform Open
Silicon-based photonics is mobilizing into a manufacturing industry with specialized integrated circuit design requirements for applications in low power cloud computing, high speed wireless, smart sensing, and augmented imaging. The AIM P…
View article: Introduction to the absolute brightness and number statistics in spontaneous parametric down-conversion
Introduction to the absolute brightness and number statistics in spontaneous parametric down-conversion Open
As a tutorial, we examine the absolute brightness and number statistics of photon pairs generated in spontaneous parametric down-conversion (SPDC) from first principles. In doing so, we demonstrate how the diverse implementations of SPDC c…
View article: Quantifying high-dimensional entanglement with Einstein-Podolsky-Rosen correlations
Quantifying high-dimensional entanglement with Einstein-Podolsky-Rosen correlations Open
Quantifying entanglement in a quantum system generally requires a complete\nquantum tomography followed by the NP-hard computation of an entanglement\nmonotone --- requirements that rapidly become intractable at higher dimensions.\nObservi…
View article: Measurement of Quantum Interference in a Silicon Ring Resonator Photon Source
Measurement of Quantum Interference in a Silicon Ring Resonator Photon Source Open
Silicon photonic chips have the potential to realize complex integrated quantum information processing circuits, including photon sources, qubit manipulation, and integrated single-photon detectors. Here, we present the key aspects of prep…
View article: Compressively Characterizing High-Dimensional Entangled States with Complementary, Random Filtering
Compressively Characterizing High-Dimensional Entangled States with Complementary, Random Filtering Open
The resources needed to conventionally characterize a quantum system are overwhelmingly large for high-dimensional systems. This obstacle may be overcome by abandoning traditional cornerstones of quantum measurement, such as general quantu…
View article: Quantum Silicon Photonics: Photon Sources and Circuits
Quantum Silicon Photonics: Photon Sources and Circuits Open
We report high performance ring resonator photon sources and the integration of the sources into quantum photonic circuits. We also discuss ring resonators as a building block for compact, reconfigurable, linear quantum optical circuits.