Matter-Wave Interferometers

Informations projet

MAWI

N° de convention de subvention: 101073088

DOI

10.3030/101073088

Date de signature de la CE 14 Juillet 2022

Date de début 1 Decembre 2022

Date de fin 30 Novembre 2026

Financé au titre de

• Marie Skłodowska-Curie Actions (MSCA)

Coût total

Aucune donnée

Contribution de l’UE

€ 2 662 308,00

Coordonné par

UNIVERSITA DEGLI STUDI DI TRIESTE
Italy

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Les liens vers les livrables et les publications des projets du 7e PC, ainsi que les liens vers certains types de résultats spécifiques tels que les jeux de données et les logiciels, sont récupérés dynamiquement sur OpenAIRE .

Livrables

Documents, reports (10)

D3.3 Development of a load-lock UHV system for the production of ultracold atoms

We will apply optimal control tools to prepare a family of different internal states of a rubidium Bose-Einstein condensate produced in an atom chip-based micro-trap [1] and employ quantum reconstruction techniques to analyze quantitatively thesestates [2]. Further we will use stochastic sequences of measurements tuning the probability distribution of the time intervals between consecutive measurements to mimic environment induced decoherence as a continuous monitoring from the environment (repetitive random measurements) [3].1] “Optimal preparation of quantum states on an atom-chip device”C. Lovecchio, F. Schäfer, S. Cherukattil, M. Alì Khan, I. Herrera, F. S. Cataliotti, T. Calarco, S. Montangero, and F. Caruso Phys. Rev. A 93, 010304(R) (2016)[2] “Quantum State Reconstruction on an Atom Chip”C. Lovecchio, S. Cherukatti, B. Cilenti, I. Herrera, F. S. Cataliotti, S. Montangero, T. Calarco and F. Caruso New J. Phys. 17, 093024, (2015)[3] “Ergodicity in randomly perturbed quantum systems”S. Gherardini, C. Lovecchio, M. M. Mueller, P. Lombardi, F. Caruso and F. S. Cataliotti Quantum Sci. Technol. 2, 015007 (2017)

D2.3 Coupling an AQUID to a rectilinear guide

Future atomtronic circuits will be fabricated by integrating the functionalities of different sub-circuits. The main objective of this deliverable is to develop machine learning based control on simple integrated atomtronic circuits with lumped parameters.Specifically, we resort to our first study to generate currents ‘on demand’ by suitable local driving of the circuits. Our approach does not rely on synthetic gauge fields, and therefore it could simplifies the technology for the manipulations of current states in atomtronic circuits considerably. In addition, the flowing currents so generated are notmesoscopic effects (displaying the characteristic inverse size dependence) and therefore they can be well defined also in the limit of larger circuits. We will focus on the study of a single ring-shaped circuit interrupted by weak impurities. In suchsystems we can generate current states without synthetic fields and therefore our systems can define AQUIDs or atomtronic flux qubits but with new specifications and a simplified architectures]. For such systems, we will develop theoretical tools for their analysis, identifying the relevant observables to read-out their physical conditions in the experiments. We will also consider simple networks of atomtronic elements like AQUIDs coupled to rectilinear wave guides. We will look at protocols to monitor the AQUID devices. The ring condensate will be described by Bose Hubbard models and suitable Gross-Pitaevskii equation with adelta barrier describing a localised weak link.

D5.11 Career development plan

Career development plan.

D1.2 Simulation of the state of the condensate , identification of the optimal parameter regimes for the atom-laser working point

Stimulated by the experimental activity at UvA we will take profit of the UGA expertise in modeling continuous atom lasers [Evaporative cooling of an atomic beam,E. Mandonnet, A. Minguzzi et al EPJD D 10, 9--18 (2000)] as well as on simulating non-equilibrium steady states by stochastic Gross-Pitaevskii equation [D. Squizzato, L. Canet, A. Minguzzi PRB B 97, 195453 (2018)]. Due the presence of a thermal cloud, a mapping to a quantum system with a bath will be developed in analogy to [J. Polo Gomez, V. Ahufinger, F.W. J. Hekking, A. Minguzzi PRL 121, 090404 (2018)]. In particular we will develop numerical simulation codes to model the experimental conditions and optimize the performances of continuous atom laser

D1.1 Atom number detection below the atom-shot-noise limit

One of the main remaining limiting factors is the relatively small number of particles (~10^6) per shot. A tight control of the atom number fluctuations is therefore crucial. Inversely, it also makes atom-number squeezing quite feasible. We plan to dothis using atom-shot-noise limited detection and quantum-nondemolition measurements of the initial atoms numbers. ESR-FORTH will explore the possibility of employing the Faraday paramagnetic effect to detect the state of a cold-atom sensor as a quantum non-demolition measurement and to generate number-squeezed atom input- states for the interferometer. This taps into an ongoing project, which has already resulted in a x100 reduction in the atom-number fluctuations using a very similar method. We will generate entanglement between atoms and squeezing, which can enhance the sensitivity of the measurement. Besides the single-shot improvement, we aim to demonstrate that with this measurement scheme the quantum state-preparation time can be greatly reduced, so that more repetitions per second can be performed. Elements of this technique have already been tested (by members of the FORTH team) in warm-atomic vapours performing full quantumnondemolition measurements.

D2.4 BEC loaded in ring and guide geometries

The development of new laser-beam shaping methods is important in a variety of fields within optics, atomic physics and biophotonics. Spatial light modulators (SLMs) offer a highly versatile method of time-dependent beam shaping, based onimprinting a phase profile onto an incident laser beam which then determines the intensity in the far field, where the atoms are trapped. In recent years, USTAN has demonstrated that engineering a laser beam with an SLM gives precise control of lightintensity patterns and phase patterns at the percentage level [1-4]. Moreover, USTAN has already obtained preliminary results of BECs trapped in these holographic traps, and in this project we will build on these initial results by extending the range ofgeometries that are investigated. In collaboration with UNITS and ABU, more complex trapping configurations will be demonstrated, e.g. several coupled ring traps, Y-junctions and a ring trap coupled to a rectilinear guide, and we will investigate tunnelling between the coupled traps.

D5.10 Progress report

Progress report.

D5.8 Data management Plan

Data management Plan.

D2.12 Design and characterization of tunable potentials for quantum interferometry

This part of the ESR is devoted to the characterization potentials needed for wave-guides and elements of connection between them, such as Y-junctions and combined Y-junctions. The combination of Y-junction geometries forming a “bubble” (i.e., ring-like) geometry will be studied.

D2.13 Study of dynamics in quantum circuits for quantum interferometry

The equilibrium and quantum dynamics in such tunable potentials will be studied, with particular attention to the effect of interactions, temperature and dependence on the tunable potentials parameters (such the transverse confinement).

Other (7)

D4.2 School 2

School 2 will mainly cover the more advanced new directions in atomtronics, metrology and sensing. Both schools are intended to have a duration of 2 weeks, with lectures given by experimentalists on specific up-to-date laboratory techniques used for the implementation of matter-wave interferometers and by theorists on numerical simulations.

D4.1 School 1

School 1 will take place just a few months after all the ESRs have started, so it will mainly cover the first two foundational scientific areas: atom cooling and interferometry. Courses to learn LabVIEW fir the interested students will also be arranged.

D5.9 Supervisory Board

Supervisory Board composition.

D4.4 Workshop 2

In Workshop 2, a student-led meeting (similar to the Young Atom Opticians conference series) will be held as a satellite of the event. In organising this, the ESRs will gain valuable skills. Working together to organise the meeting will be an excellent team-building exercise.

D5.2 All positions advertised internationally

Recruitment advertising will start immediately after the kick-off meeting through a targeted advertisement for all posts simultaneously in order to maximise impact, and we expect that all the ESRs will be appointed by month 6, in time for the first school in month 9. The Recruitment manager will ensure it is advertised widely via the MAWI website, participant’s webpages, and national and international recruitment portals (e.g. www.findaphd.com and QUROPE). We will also advertise in high-impact journals and use our extensive network of contacts within the international research community. The Recruitment manager will deal with any re-advertising needed should any PhD student withdraw.

D5.1 MAWI website

Website of the Consortium

D4.3 Workshop 1

In Workshop 1, in addition to the standard scientific programme, a 2-day computing course will be offered, covering for the interested ESR software (Matlab, Python), software architecture and professional programming (i.e. how to structure and comment and test code for use of others), and HPC.