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Portail > Offres > Offre UMR7504-CATBON-024 - Post-doc (H/F) Spectroscopie cohérente et résolue en temps de Qbits individuels dans les matériaux 2D

Post-doc position (M/F) Coherent ultrafast spectroscopy of individual Qbits in 2D materials

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Français - Anglais

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General information

Reference : UMR7504-CATBON-024
Workplace : STRASBOURG
Date of publication : Friday, September 11, 2020
Type of Contract : FTC Scientist
Contract Period : 18 months
Expected date of employment : 1 November 2020
Proportion of work : Full time
Remuneration : Gross salary from 2675.27 € (depending on the experience)
Desired level of education : PhD
Experience required : Indifferent


Quantum dots or defects in solid-state systems, confined in the three dimensions, are candidates of choice for the realization of robust Qbits and efficient single photon emitters. These building blocks play a central role in the emerging field of quantum science and technologies [1]. Additionally such systems are of great interest for fundamental quantum optics experiments. In this context, the recent discovery [2,3] of single emitters hosted in two dimensional materials (2DM) opens appealing perspectives: (i) they inherit exceptional properties from 2D materials (strong light-matter interaction, photon-extraction efficiency, tunable properties), and (ii) they offer a strong potential for quantum behavior and single photon emission at room temperature, which is essential for practical implementation of quantum technologies. Still, although QDs in 2DM generate considerable interest, their fundamental and coherent properties, and the control of the latter deserve further exploration
[1] N. Aaronson et al. Proc. 43rd Annual ACM Symposium on Theory of Computing 333–342 (ACM, 2011)
[2] A. Srivastava et al. Single photon emitters in exfoliated WSe2 structures Nature Nanotechnology 10, 491 (2015)
[3]A Tran et al Quantum emission from hexagonal boron nitride monolayers Nature Nanotechnology 11 37–41(2016)


Our project aims to investigate the quantum behavior of single QDs hosted in 2DM. In particular we will explore the light-matter interaction and coherent dynamics at single system level. To this end, a forefront coherent time-resolved optical experiment (four wave mixing configuration) based on spectral interferometry and optical heterodyning will be performed [4, 5]. Such an experiment allows to probe and address single quantum states with ultrafast optical pulses. First, we will study the role played by the crystalline environment in the decoherence processes of single Qbits and the robustness of their quantum behavior increasing temperature. Second, due to their scalability, van der Waals heterotructures made from 2DM offer unique possibility to engineer controlled array of quantum emitters (Moiré structures for instance). By combining non-linear microscopy with a super-resolution approach, we will push the coherent spectroscopy to a new limit and then address excitonic and spin coherences of single traps, and reveal their potentials for applications in quantum technologies.
[4] F. Fras et al Multi-wave coherent control of a solid-state single emitter Nature Photonics 10, 155–158 (2016)
[5] D Wigger et al. Exploring coherence of individual excitons in InAs quantum dots .Phys. Rev. B 96, 165311 (2017)


We are looking for a highly motivated post-doctoral fellow, holding a doctoral degree in physics, with a solid base in optical spectroscopy. Knowledge in ultrafast optics, condensed matter single photon emitters or 2D materials physics will be highly appreciated. The fellow should have a vocation for forefront and challenging experimental research, as well as being fluent in spoken and written English with communication and team working skills.

Work Context

The project will benefit from i) a newly furnished, devoted to the project, ultrafast optics lab : tunable pulsed laser, CW laser, spectrometers, helium cryostat embedding nano-positioners ii) access to a 180 m²² ISO class 6 cleanroom area with all the equipment for devices nanofabrication down to several tens of nanometers, with a dedicated room for 2D materials processing iii) a rich scientific environment within the institute [6, 7] and ongoing collaborations about emerging activities on quantum and 2D materials (IPCMS), and state of the art sample processing (CINAM Marseille) iv) supports of the ANR Grant “FINDING” and the
[6] G. Froehlicher et al Charge versus energy transfer in atomically thin graphene-tmd dichalcogenide vdWs heterostructures PRX 8, 011007 (2018)
[7] E . Lorchat et al Filtering the photoluminescence spectra of atomically thin semiconductors with graphene Nature Nano. 15, 283–288(2020)

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