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PhD position: towards a Josephson traveling wave single photon detector (M/F)

This offer is available in the following languages:
Français - Anglais

Date Limite Candidature : mercredi 11 août 2021

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General information

Reference : UPR2940-ELOBER-049
Workplace : GRENOBLE
Date of publication : Wednesday, July 21, 2021
Scientific Responsible name : Nicolas Roch
Type of Contract : PhD Student contract / Thesis offer
Contract Period : 36 months
Start date of the thesis : 1 September 2021
Proportion of work : Full time
Remuneration : 2 135,00 € gross monthly

Description of the thesis topic

During the last decade, it has been demonstrated that superconducting Josephson circuits behave as quantum bits and are very well suited to realize advanced quantum mechanical experiments. These circuits appear as artificial atoms whose properties are defined by their electronic characteristics (capacitance, inductance and tunnel barrier).

Moreover, given their mesoscopic size, these quantum bits couple very strongly to electromagnetic radiations in the microwave range. Thus, it is now possible to perform quantum optics experiments using microwave photons and to unravel light-matter interactions using circuits. This field is dubbed circuit-QED (Quantum Electro-Dynamics).

Measuring these microwave photons with very high quantum efficiency remains a tremendous challenge, since the energy conveyed by one single microwave photon is hundreds thousand times smaller than the one of usual optical photons. Yet signals with energy comparable to the one of a single-photon can be measured using Josephson parametric amplifiers.

In our team we are now using superconducting metamaterials to engineer the next generation of parametric amplifiers. Building on this unique expertise, we now want to build a device able to detect a single microwave photon over an ultra large bandwidth. Applications include but are not limited to single spin detection or microwave quantum optics.

Work Context

The quanteca team specializes in the coherent control and manipulation of superconducting quantum circuits. The student will use state-of-the-art setups combining very low temperatures (around 10 mK), fast electronics and quantum-limited microwave detection chains. The devices are fabricated in the clean room of the Neel Institute (Nanofab). This project is funded by the European Union via the AVAQUS project.
We are seeking motivated students who want to take part to a state-of-the-art experiment.
The Institut NEEL is one of the largest French national research institutes for fundamental research in condensed matter physics enriched by interdisciplinary activities at the interfaces with chemistry, engineering and biology. It is located in the heart of a unique scientific, industrial and cultural environment. It is part of one of Europe's biggest high-tech environment in micro- and nanoelectronics, right next to the French Alpes.

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