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Optimizing the quality factor of InP nanobeam cavities using atomic layer deposition

Applied Physics Letters

Rahaman, Mohammad H.; Lee, Chang-Min; Buyukkaya, Mustafa A.; Harper, Samuel; Islam, Fariba; Addamane, Sadhvikas J.; Waks, Edo

Photonic crystal nanobeam cavities are valued for their small mode volume, CMOS compatibility, and high coupling efficiency-crucial features for various low-power photonic applications and quantum information processing. However, despite their potential, nanobeam cavities often suffer from low quality factors due to fabrication imperfections that create surface states and optical absorption. In this work, we demonstrate InP nanobeam cavities with up to 140% higher quality factors by applying a coating of Al2O3 via atomic layer deposition to terminate dangling bonds and reduce surface absorption. Additionally, changing the deposition thickness allows precise tuning of the cavity mode wavelength without compromising the quality factor. This Al2O3 atomic layer deposition approach holds great promise for optimizing nanobeam cavities that are well-suited for integration with a wide range of photonic applications.

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Mid-circuit Measurement & Branching in QSCOUT: A Ping-Pong Teleportation Exemplar Program

Landahl, Andrew J.; Rudinger, Kenneth M.; Russo, Antonio E.; Ruzic, Brandon P.; Yale, Christopher G.; Clark, Susan M.

This document is intended to help users program the new mid-circuit measurement (MCM) and classical branching capabilities of the Quantum Scientific Computing Open User Testbed (QSCOUT). Here, we present and explain an exemplar “ping-pong teleportation” program that makes repeated MCM and branching calls. The program is written in Jaqal, the quantum assembly language used by QSCOUT. This document is intended to accompany a companion Jupyter notebook Exemplar_one_bit_teleportation_pingpong.ipynb.

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Metrological Guidance for the Calibration of Laboratory Glassware

Mackrory, Andrew J.

This report provides technical guidance for the calibration of laboratory glassware to help the practitioner achieve traceability to the International System of Units and meet customer quality requirements. The discussion of traceability uses the National Institute of Standards and Technology’s seven essential elements of traceability as a framework. The guidance also includes how to determine when calibration is necessary, practical tips, and helpful references.

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Synthesis and crystal structure of 2,9-diamino-5,6,11,12-tetrahydrodibenzo[a,e]cyclooctene

Acta Crystallographica Section E: Crystallographic Communications

Valdez, Nichole R.; Nagel, Eric; Redline, Erica; Rodriguez, Mark A.; Staiger, Chad L.; Dugger, Jason; Foster, Jeffrey

The cis- form of diaminodibenzocyclooctane (DADBCO, C16H18N2) is of interest as a negative coefficient of thermal expansion (CTE) material. The crystal structure was determined through single-crystal X-ray diffraction at 100 K and is presented herein.

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Results 651–675 of 99,299
Results 651–675 of 99,299