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Reference : UMR7538-BRULAB-009
Workplace : VILLETANEUSE
Date of publication : Tuesday, November 10, 2020
Type of Contract : FTC Scientist
Contract Period : 24 months
Expected date of employment : 1 December 2020
Proportion of work : Full time
Remuneration : 2700 €
Desired level of education : PhD
Experience required : 1 to 4 years
The goal is to perform experiments on a chromium quantum gas experiment, in order to characterize the growth of entanglement in an ensemble of localized interacting spins. In our experiment chromium atoms are localized at the nodes a periodic potential made by an optical lattice, and they interact at long range through dipole-dipole interactions. The work will take place within a European network of researchers (in Germany, Austria, Italy, Poland, Spain, and France) who combine experimental and theoretical approaches to explore how strongly magnetic atoms can be used for quantum simulations purposes, and to investigate novel quantum many-body physics.
The activity is within the Magnetic Quantum Gas group at the Laser Physics Institute in Villetaneuse.
The goal is to characterize the dynamical growth of entanglement, by using new experimental tools that will be developed in close collaboration with theoretical studies. Our approach relies on the fine measurement of collective properties such as the spin length and its fluctuations. In addition, the post-doc will implement bichromatic optical lattices, which will create an array of double potential wells. In this system, the collective spin of the atoms can be measured independently in the odd wells and in the even wells. Measuring the spin state of atoms in every other site constitutes a bi-partite measurement, which is known to offer efficient ways to characterize entanglement in a large pure system.
The post-doctoral researcher will first finalize setting up the double-well lattice architecture, together with one PhD student that he/she will contribute supervising. Then the candidate will be involved in setting up the differential measurements leading to the characterization of bi-partite spin fluctuations. This will be realized in close collaboration with our theory collaborators, and in particular with Tommaso Roscilde (through our ANR project EELS), in order to explore which measurements may best reveal entanglement.
The candidate should have a strong background in AMO experimental physics, cold atom physics, and the use of cold atoms to investigate quantum many-body physics. He/she should master all the relevant experimental techniques of a quantum gas experiment, show interest towards quantum many-body physics, and possess an excellent team spirit.
Loading quantum gases in periodic potentials made of optical lattices has become a prominent way to investigate quantum many-body physics. Our project focuses on the magnetic properties of chromium quantum gases, which are quite original as high spin S=3 chromium atoms interact with each other through dipolar interactions. The long-range character of dipolar interactions ensures coupling of atoms loaded in different sites of the optical lattice. We have recently shown that our isolated many-body dipolar spin system system thus thermalizes under the effect of long-range interactions, consistent with a scenario of quantum thermalization. These studies pioneered research on quantum magnetism using atoms with strong magnetic dipole-dipole interactions. The goal is now to reveal quantum correlations within these systems.
Work will take place at the Laser Physics Institute of Paris 13 University. The Magnetic Quantum Gases group at LPL combines two experimental projects studying magnetism on Chromium and Strontium, and a theory activity, linked to a large network of national and international collaboration. Our group hosts three researchers from the Paris 13 University, two CNRS researchers, and one CNRS Engineer. At the moment, four PhD students are working on our projects. The post-doc will participate to our developing European network (MAQS – Qauntera), which aims at studying how strongly magnetic atoms such as Chromium, Erbium or Dysprosium loaded into optical lattices can be used in quantum simulation experiments.
This project is funded by Quantera, within the Maqnetic Atoms Quantum Simulators network. This network is lead by LPL, and involves the groups of T. Pfau (Germany), F. Ferlaino and P. Zoller (Austria), M. Gajda (Poland), G. Modugno (Italy), M. Lewenstein (Spain), and T. Roscilde (France).
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