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Autopsy of a quantum electrical current

Abstract : Quantum physics experiments have reached a level of precision and control that allows quantum state engineering for many systems. This has led to the birth of electron quantum optics, an emerging field which aims at generating, manipulating and characterizing quantum electrical currents built from few-electron excitations propagating within ballistic quantum conductors. This is challenging since it is generically impossible in practice to fully characterize the many-body state of a beam containing indistinguishable electrons. The thesis presents new quantum signal processing approaches for accessing, at least partially, to the quantum many-body state of quantum electrical currents.A first approach is to access such a state at few-particle levels through electronic coherences. We will thus present a new representation of single-electron coherence in terms of electronic "atoms of signal". Combining this signal processing algorithm to HOM tomography enables us to present the first autopsy, wavefunction by wavefunction, of an experimental electrical quantum current. Another method is to look for indicators giving information directly at the many-body level. We will investigate the radiation emitted by a quantum conductor and address the problem of decoherence of a general single-electron excitation. Finally, we will look at the heat deposited by a mesoscopic quantum system, leading to a quantum version of Joule heating and discuss how it gives an insight on the many-body state of the electron fluid
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Submitted on : Tuesday, March 13, 2018 - 5:01:14 PM
Last modification on : Saturday, March 13, 2021 - 3:32:27 AM
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  • HAL Id : tel-01730943, version 1



Benjamin Roussel. Autopsy of a quantum electrical current. Quantum Physics [quant-ph]. Université de Lyon, 2017. English. ⟨NNT : 2017LYSE1285⟩. ⟨tel-01730943⟩



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