Presentations 2021

Buchmüller, Oliver — Fundamental Forces — The SM, The Higgs Discovery, and GW Intro (Slides)
Lecture Slides (pptx)

Buchmüller, Oliver — Fundamental Forces — AION and AEDGE (Slides)
Lecture Slides (pdf) Lecture Slides (pptx)

Weak values in the study of quantum correlations (Zamora, Santiago)
(Physics Institute, UNAM) Abstract Weak values have become of interest in recent years due to their several applications and their succesful experimental realization. Among their applications, they are useful in the theoretical detection of quantum correlations. In this talk I will present the general idea of what is a weak value and a quantum entanglement criterion for a system of 2 particles in a pure state using the weak values formalism. Slides

Sinkevičienė, Mažena Mackoit — Quantum metrology: from solids to cold atoms
k I will touch two directions of my research: color centers in solids that I have investigated during my PhD studies and cold atom systems that I am going to investigate during my Postdoc. First, I will present my studies of solidstate systems capable of emitting nonclassical states of light. Subsequently I will briefly describe the idea of creating the nonclassical spin states and spin squeezing for the cold fermionic atoms in optical lattices by applying the spinorbit coupling and the periodic driving of the system.

Semakin, Aleksei — Experiments with ultralow atomic hydrogen
We designed and constructed of a large magnetic trap for storage and cooling of atomic hydrogen operating in the vacuum space of the dilution refrigerator at temperature of 1.5 K. Aiming on a largest volume of the trap we implemented octupole configuration of linear currents (Ioffe bars) for radial confinement, combined with two axial pinch solenoids and a 3.5 T solenoid for cryogenic H dissociator. The octupole magnet is built from 8 racetrack coils  segments which are compressed towards each other with magnetic forces. This provides a mechanically stable and robust construction with a possibility of replacement/repair of each segment. The trap is thermally linked to the 1 K…

Kang, Seji — Inertial sensing using an expanding atomic point source
Point source atom interferometry (PSI) provides a compact tool to measure rotation and acceleration from phase differences between two atomic states. In an expanding lasercooled atomic source within the π/2  π  π/2 Raman pulses, rotation in the perpendicular plane to the Raman beams generates interferometer phases leading to spatial fringes in the atomic state populations. The acceleration along the Raman beam determines the phase offset to the fringes. Here, we introduce our recent methods for extracting rotation and acceleration from fringes and discuss about its sensitivity and stability.

Assendelft, Joep — Squeezing momentum states for atom interferometry
We are working on a method to realise the creation of squeezed momentum states that can be used for atom interferometry. The idea behind the method is to perform a probing measurement on a narrow transition in the dispersive regime inside a ring cavity, such that we measure the relative population of the two momentum states. The goal is to use this method to reach an interferometer phase scaling of N^(3/4), therefore surpassing the standard quantum limit of N^(1/2).

Gerstenecker, Benedikt — Ultracold Caesium on an Atomchip: An Atom Interferometer with Tunable Interactions
The matterwave properties of atoms and the macroscopic behavior of BoseEinstein condensates make interference experiments with ultracold atoms a useful tool for both fundamental research and metrology applications. A unique design allows us to combine the advantages of atomchip technology with the flexibility of optical traps and furthermore the favorable magnetically induced Feshbach resonances in Caesium, which are wellsuited for interactiontuning and therefore enable condensation of this challenging atomic species. The tunability of the atoms' scattering length and the convenient access to the trap characteristics will give us full control over the crucial parameters, allowing for the simulation of different regimes of twomode systems as well as for competing with…

Hawkins, Leonie — MAGIS100: 100m atom interferometric quantum sensor
MAGIS100 is a 100 m scale quantum sensor to be built at Fermilab. It will be the world’s largest atom interferometry experiment and will be used to search for physics beyond the standard model. MAGIS will be composed of multiple atom interferometers spaced across a single baseline to measure a differential phase shift, allowing many of the limiting systematics to drop out. A novel detection technique known as phaseshear imaging will be employed to allow singleshot imaging. This involves retroreflecting the final laser pulse of the interferometer sequence to imprint interference fringes across the cloud, allowing singleshot measurements of the phase to be read out. To determine the optimal operating…