Toward flying qubit spectroscopy

Benoît Rossignol (1) , Thomas Kloss (1) , Pacome Armagnat (1) , Xavier Waintal (1)

1 GT - Laboratory of Quantum Theory

While the coherent control of two level quantum systems-qubits-is now standard, their continuum electronic equivalents-flying qubits-are much less developed. A first step in this direction has been achieved in DC interferometry experiments. Here, we propose a simple setup to perform the second step, the spectroscopy of these flying qubits, by measuring the DC response to a high frequency AC voltage drive. Using two different concurring approaches-Floquet theory and time-dependent simulations-and three different models-an analytical model, a simple microscopic model and a realistic microscopic model-we predict the power-frequency map of the multi-terminal device. We argue that this spectroscopy provides a direct measurement of the flying qubit characteristic frequencies and a key validation for more advanced quantum manipulations.

Domaines: Matière Condensée [cond-mat]

Benoît Rossignol, Thomas Kloss, Pacome Armagnat, Xavier Waintal. Toward flying qubit spectroscopy. Physical Review B: Condensed Matter and Materials Physics (1998-2015), 2018, 98 (20), pp.205302. ⟨10.1103/PhysRevB.98.205302⟩. ⟨hal-02007796⟩