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Post-doctoral position Modal approach to (quantum) multi-parameter estimation in optics
The Rayleigh criterion, once considered a fundamental limit in imaging, has been surpassed by quantum-inspired metrology techniques like Spatial Mode demultiplexing (SPADE) [1]. This post-doctoral project aims to extend SPADE’s capabilities to multi-parameter estimation, low-flux detection, and dynamic source tracking. The post-doc will work on/supervise an experimental setup aimed at multi-parameter estimation from individual incoherent optical sources [2] using a Multi-Plane Light Convertor [3]. She/He will also participate in the theoretical effort in deriving optimal quantum bounds [4] and optimal estimators [5].
The multimode quantum optics group pioneered the modal approach to quantum metrology [6] and obtained unparalleled sensitivity in source separation estimation [2] using a unique technology invented in the group [3]. The group has a strong experimental focus, but is also engaged in purely theoretical activities aiming at developing quantum optics in the continuous variable (CV) framework.
In a nutshell
Why to apply:
-you are passionate about fundamental quantum science and/or technological applications
-you will benefit from an international team of researchers who are experts in Continuous Variable quantum optics and metrology (theory and experiment)
– you will be in a group at the core of many national and international research networks
Our specific view:
– Experiments and theory should go together to implement practical parameter estimation at the quantum limit
– Modal approach to quantum metrology allows both for quantum limited parameter estimation and to derive theoretical bounds closely related
Environment
As a whole, the group has a tradition of working together with a diverse range of people from varied backgrounds. This diversity often leads to fruitful scientific input from different points of view, and it allows the group to explore new avenues. Furthermore, the moderate size of our group gives PhD students and postdocs the opportunity to discuss with PIs on a daily basis. This fosters a dynamic atmosphere with a lot of space for discussion.
Your work will be supported by the CEA-Audace project Lumiere, which aims to provide support and build collaborations. Notably, the project will enable you to gain access to groundbreaking multi-photon detectors with very high sensitivity and fast response time, promising significant advancements in metrology and tracking applications.
The project is inherently interdisciplinary, bridging quantum optics with fields such as signal processing, machine learning, and advanced instrumentation. It also benefits from strong collaborations with national and international teams, ensuring frequent exchanges of ideas and expertise.
Practical information
Candidates must hold an internationally recognized PhD in a field related to experimental quantum physics. A good background and past research track record in experimental optics, and quantum physics is required.
Application procedure: Inquiries and applications should be sent by email to Nicolas Treps(nicolas.treps@lkb.upmc.fr). Applications should include a detailed CV and two names of potential referees
Salary: Monthly net salary (after-tax) between 2200€ and 2900€, depending on experience
Application deadline: Preferentially apply before 16 May 2025
Starting date: flexible
Duration: 2 years (with possible renewal of 1 year)
References
[1] Tsang, M., Nair, R., & Lu, X. M. (2016). Quantum theory of superresolution for two incoherent optical point sources. Physical Review X, 6(3), 031033.
[2] Rouvière, C., Barral, D., Grateau, A., Karuseichyk, I., Sorelli, G., Walschaers, M., & Treps, N. (2024). Ultra-sensitive separation estimation of optical sources. Optica, 11(2), 166-170.
[3] G. Labroille, BertrDenolle, P. Jian, P. Genevaux, N. Treps, and J.-F. Morizur, Efficient and mode selective spatial mode multiplexer based on multi-plane light conversion, Opt Express 22, 15599 (2014).
[4] Gessner, M., Treps, N., & Fabre, C. (2023). Estimation of a parameter encoded in the modal structure of a light beam: a quantum theory. Optica, 10(8), 996-999.
[5] G. Sorelli, M. Gessner, M. Walschaers, and N. Treps, Optimal Observables and Estimators for Practical Superresolution Imaging, Phys. Rev. Lett. 127, 123604 (2021).
[6] C. Fabre and N. Treps, Modes and States in Quantum Optics, Rev. Mod. Phys. 92, 035005 (2020).
2-year postdoctoral position on dynamical phase transitions in Bose gases
A theoretical postdoctoral position opens at LKB in Paris, to address the non-equilibrium dynamics of 2D Bose gases quenched across the Kosterlitz-Thouless transition. The project will involve a variety of methods such as field theories, kinetic approaches and numerical simulations. A collaboration with the local experimental group investigating non-equilibrium fluids of light will be possible. The postdoc is expected to start on January 2025, but the position will remain open untill filed.
Interested candidates should contact Nicolas Cherroret at nicolas.cherroret@lkb.upmc.fr. See here for a more detailed description of the position.
