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DTSTART:20260329T030000
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DTSTAMP:20260424T041211Z
UID:1764237600@ist.ac.at
DTSTART:20251127T110000
DTEND:20251127T120000
DESCRIPTION:Speaker: Sebastian Wald\nhosted by Scott Waitukaitis\nAbstract:
  Atom interferometers measure the relative phase shifts between coherent m
 atter-wave paths that arise from interactions with external fields or iner
 tial forces. Due to their exceptional phase sensitivity\, atom interferome
 ters became an essential tool for precision measurements and fundamental p
 hysics experiments\, finding applications in geodesy\, gravimetry\, and in
 ertial navigation. However\, their measurement precision is limited by qua
 ntum projection noise\, which arises from the Heisenberg uncertainty princ
 iple\, preventing the measurement of atomic states with absolute precision
 . The generation of entanglement between the atoms offers a path to surpas
 s this so-called standard quantum limit\, thereby enhancing the interferom
 eter’s phase sensitivity beyond classical measurement bounds.This thesis
  reports on the development of an atom interferometer experiment designed 
 to realize cavity-mediated\, squeezed Mach-Zehnder-type interferometry wit
 h ultra-cold 87Rb atoms. The experiment combines cavity-aided spin-squeezi
 ng with cavity-mediated Mach-Zehnder interferometry to demonstrate entangl
 ement-enhanced phase sensitivity. The experiment is centered on a triangul
 ar optical cavity that mediates all relevant atom-light interactions. The 
 cavity provides optical trapping\, spin-squeezing\, and Raman beam-splitte
 r operations\, enabling to perform interferometry on a continuously trappe
 d atomic ensemble.The thesis elaborates on the fundamental theoretical fra
 mework\, the cavity design\, and the full optical setup\, including the de
 tailed configuration of the developed laser stabilization methods. Experim
 entally\, continuous loading methods were explored\, resulting in an accum
 ulation of up to four million atoms in the dipole trap within a cycle time
  of 500 ms. The AC-Stark shift compensation method developed for continuou
 s loading was further applied for in-trap cooling to 10 μK\, and optical 
 pumping for efficient atomic state preparation. Coherent state control was
  verified via observation of microwave-driven Rabi oscillations\, and used
  to characterize atom-cavity coupling.These presented results establish th
 e experimental groundwork for the future development of cavity-mediated\, 
 entanglement-enhanced Mach-Zehnder-type atom interferometry. 
LOCATION:Central Bldg / O1 / Mondi 2b (I01.O1.008)\, ISTA
ORGANIZER:
SUMMARY:Sebastian Wald: Thesis Defense: Atoms in a Propagating-Wave Cavity 
 for Squeezed Mach-Zehnder Atom Interferometry
URL:https://talks-calendar.ista.ac.at/events/6141
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