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PhD position: coherent manipulation of a many-body superconducting quantum circuits.

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Français - Anglais

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General information

Reference : UPR2940-FLOPOI-033
Workplace : GRENOBLE
Date of publication : Friday, July 24, 2020
Scientific Responsible name : Nicolas ROCH
Type of Contract : PhD Student contract / Thesis offer
Contract Period : 36 months
Start date of the thesis : 1 October 2020
Proportion of work : Full time
Remuneration : 2 135,00 € gross monthly

Description of the thesis topic

One of the present leading technologies for the realization of a universal quantum computer is based on superconducting quantum circuits (SQCs). It exploits superconducting circuits based on Josephson junctions, which are characterized by quantized energy levels and for this reason can be adopted as quantum bits (qubits), the basic units of quantum information. While high quantum coherence has been demonstrated for systems containing a few number of qubits, a full-fledge quantum computer will require the interconnection and manipulation of hundreds of highly coherent qubits. This obviously imposes very challenging engineering issues but also raises interesting points regarding our current understanding of quantum mechanics. For example, questions such as “how coherent can a large quantum system be?” or “what is the quantum to classical transition when many quantum systems are interacting?” remain open.
Our team focuses on the fabrication and characterization of machines called quantum simulators [1,2], which are dedicated to a given class of physical problems (e.g. quantum impurities, Hubbard models...). The required building blocks (quantum bits) as well as the control electronics are similar to the one of the universal quantum computer but since universality is not required, the overhead developments are less stringent. As such, these simulators should allow us to address the above-mentioned questions with an experimental platform much simpler than a universal quantum computer. This Master project aims at setting-up an experiment to perform time-resolved manipulation of the quantum simulator we recently demonstrated. In particular, the student will develop quantum information protocols to reveal the coherence properties of this many-body system.
[1] A tunable Josephson platform to explore many-body quantum optics in circuit-QED, J. Puertas-Martinez, et al. npj Quant. Info. 5, 19 (2019).
[2] Superconducting quantum bits with artificial damping tackle the many body problem, A. Cottet, npj Quant. Info. 5, 21 (2019).

Work Context

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.
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 QuantERA Network.
We are seeking motivated students who want to take part to a state-of-the-art experiment and put some efforts in the theoretical understanding of many-body physics using superconducting quantum circuit.

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