• Abstracts,  Presentations

    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

  • Abstracts,  Presentations

    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 solid-state systems capable of emitting non-classical states of light. Subsequently I will briefly describe the idea of creating the non-classical spin states and spin squeezing for the cold fermionic atoms in optical lattices by applying the spin-orbit coupling and the periodic driving of the system.

  • Abstracts,  Presentations

    Semakin, Aleksei — Experiments with ultra-low 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 race-track 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…

  • Abstracts,  Presentations

    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 laser-cooled 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.

  • Abstracts,  Presentations

    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).

  • Abstracts,  Presentations

    Gerstenecker, Benedikt — Ultracold Caesium on an Atomchip: An Atom Interferometer with Tunable Interactions

    The matter-wave properties of atoms and the macroscopic behavior of Bose-Einstein 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 well-suited for interaction-tuning 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 two-mode systems as well as for competing with…

  • Abstracts,  Presentations

    Hawkins, Leonie — MAGIS-100: 100m atom interferometric quantum sensor

    MAGIS-100 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 phase-shear imaging will be employed to allow single-shot imaging. This involves retro-reflecting the final laser pulse of the interferometer sequence to imprint interference fringes across the cloud, allowing single-shot measurements of the phase to be read out. To determine the optimal operating…