Quantum limited probing of many-body systems

Project Information

QuProbe

Grant agreement ID: 101032523

DOI

10.3030/101032523

Project closed

EC signature date 12 March 2021

Start date 1 September 2021

End date 31 August 2023

Funded under

• EXCELLENT SCIENCE - Marie Skłodowska-Curie Actions

Total cost

€ 186 167,04

EU contribution

€ 186 167,04

Coordinated by

TECHNISCHE UNIVERSITAET WIEN
Austria

Periodic Reporting for period 1 - QuProbe (Quantum limited probing of many-body systems)

Reporting period: 2021-09-01 to 2023-08-31

Summary of the context and overall objectives of the project

Quantum simulations can obtain insights into the complicated dynamics of many-body systems that are influenced by quantum mechanical effects. The project QuProbe was concerned with the development of new detection and probing methods to enhance the capabilities of quantum simulators utilizing ultracold atoms.
Overall, the results of this project provide new methods for preparing and reading out quantum simulators and will allow us to perform quantum simulations in totally new regimes in the future. This is also of great interest in respect to future quantum technologies that are currently being developed.

Work performed from the beginning of the project to the end of the period covered by the report and main results achieved so far

Based on the high degree of control we used outcoupling of atoms, that is removing some parts of the system, to probe the quantum many-body state while at the same time keeping the disturbance as low as possible. Furthermore, we developed a new detection method combining dispersive imaging and multi-pass microscopy from biological imaging; this method will provide us so far unprecedented precision in the future.
For testing our methods as well as for performing the quantum simulations themselves the controlled preparation of “interesting” states, that have quantum properties, is of great interest. Thus, we investigated the process of preparing spin-squeezed states by splitting a single condensate into two. By utilizing the insight into the many-body quantum dynamics we were able to develop a new two-step splitting procedure producing highly spin-squeezed states in multi-mode Bosonic Josephson junctions.
The work performed in this project was published in peer-reviewed scientific journals and was disseminated to the community by presenting talks at conferences across Europe. To inform the broader audience about the work we wrote a press release and a short, informative article in easy language about our work.

Progress beyond the state of the art and expected potential impact (including the socio-economic impact and the wider societal implications of the project so far)

The project results include three major steps beyond the current state of the art:
i) We developed a machine-learning-assisted optimization scheme for optical dipole potentials with digital-micromirror devices.
ii) We developed a new scheme for preparing highly spin-squeezed states in multimode Bosonic Josephson junction by utilizing the dynamics during the splitting process.
iii) We developed a method that allows us to read out to conjugate observables in tunnel-coupled double wells.

The progress of this project has mainly impact on the fundamental quantum science and technology community.
Combining those three results in the future will for example allow us to study the sine-Gordon model in a quantum regime experimentally and probe thermalisation dynamics via time-time correlations.

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