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# Dr. Audrey Cottet : research summary back to menu

I performed an experimental
PhD on superconducting quantum bits (Saclay, France,
1999-2002). This work led to the first superconducting quantum bit prototype
with a lifetime of the order of a microsecond [Science **296**, 886 (2002)]. After my
thesis, I became a theorist of hybrid mesoscopic and nanoscopic
electronic circuits. I was a post-doc in Basel, Switzerland (2002-2005), and
then Paris (2005-2008), working on spin dependent transport in quantum dots as
well as superconducting and ferromagnetic proximity effects in hybrid diffusive
structures. Highlights from my post-docs include the development of
gate-controlled nanospintronics with carbon nanotubes
[Nature Phys. **1**, 99 (2005)], a prediction
of positive current cross-correlations in quantum dot circuits [Phys. Rev.
Lett. **92**, 206801 (2004) /
Phys. Rev. B **70**, 115315 (2004)], which
was realized experimentally in 2007 in the group of C. Marcus in Harvard, and
the development of spin-dependent boundary conditions for quasi-classical
superconductivity [Phys.
Rev. B **72**, 180503(R) (2005)
/ Phys.
Rev. B **80**, 184511 (2009)].
Since my arrival at the Laboratoire Pierre Aigrain of ENS-Paris, I am mainly focusing on the
development of *Mesoscopic Quantum
Electrodynamics* (or Cavity Quantum Electrodynamics with hybrid nanocircuits), in close collaboration with the experimental
"Hybrid
Quantum Circuits" team. The first experimental results of this
collaboration include the observation of a coherent spin/photon coupling at the
single spin level [Science
**349**, 6246 (2015)],
photon-emission by a quantum dot/superconductor junction [Phys. Rev. X, 6, 021014 (2016)] and the
freezing of the charge dynamics in a Kondo impurity [Nature **545**,
71 (2017)]. More details on these different activities can be found
below.

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