Quantum sensors based on cold atoms have demonstrated unprecedented sensitivity, accuracy, and long-term stability that outcompetes “classical” sensors presently used for GPS-free positioning, navigation, and timing (PNT) systems. A crucial part of autonomous navigation is an accurate map of the local gravitational field. Portable absolute quantum gravimeters will enable higher-resolution...
We study domain wall motion in pseudo-spin-½ ultracold $^{87}$Rb gas initialized in an ‘up-down-up’ configuration, with helical domain walls between the regions of different magnetization. The interplay between diffusive pressure and induced spin-currents due to spin-exchange collisions leads to complex domain-wall dynamics. We qualitatively distinguish two regimes of wall motion. At short...
Purpose and Hypothesis: To lessen patient discomfort and improve breast cancer biopsy efficacy, a smaller, acupuncture sized needle should be used for core needle biopsies. Minimally invasive Mosquito Bite Needle Endoscopy (MBNE) using a 34-gauge acupuncture-sized needle with WAR tri-modal imaging could improve diagnostic accuracy and reduce unnecessary biopsies.
Methods: An 85-micron...
Purpose and Hypothesis:
A confocal microscope capable of accurate tissue pathology classification using a WAR tri-modal optical diagnosis system (White-light imaging, Autofluorescence imaging, and Raman spectroscopy) has the potential to improve the specificity and sensitivity to reliably diagnose breast cancer and thyroid cancer. The device will be used to build a database for Raman...
A coherent source of ultra-cold neutral atoms is a crucial prerequisite for state-of-the-art quantum sensors based on matter-wave interferometry, such as quantum gravimeters. Evaporative cooling is typically a slow process, often requiring tens of seconds, hence rapid cooling schemes are desirable to increase measurement rates. We present a numerical model for the evaporative cooling of...
