Floquet interferometry of a dressed semiconductor quantum dot

A quantum system interacting with a time-periodic excitation creates a ladder of hybrid eigenstates in which the system is mixed with an increasing number of photons. This mechanism, referred to as dressing, has been observed in the context of light-matter interaction in systems as varied as atoms,...

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Bibliographic Details
Published in:arXiv.org 2024-08
Main Authors: Felix-Ekkehard von Horstig, Peri, Lorenzo, Barraud, Sylvain, Shevchenko, Sergey N, d, Christopher J B, Gonzalez-Zalba, M Fernando
Format: Article
Language:English
Subjects:
Atomic properties
Eigenvectors
Excitation
Hybrid systems
Interference fringes
Quantum dots
Quantum theory
Qubits (quantum computing)
Reservoirs
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Summary:A quantum system interacting with a time-periodic excitation creates a ladder of hybrid eigenstates in which the system is mixed with an increasing number of photons. This mechanism, referred to as dressing, has been observed in the context of light-matter interaction in systems as varied as atoms, molecules and solid-state qubits. In this work, we demonstrate state dressing in a semiconductor quantum dot tunnel-coupled to a charge reservoir. We observe the emergence of a Floquet ladder of states in the system's high-frequency electrical response, manifesting as interference fringes at the multiphoton resonances despite the system lacking an avoided crossing. We study the dressed quantum dot while changing reservoir temperature, charge lifetime, and excitation amplitude and reveal the fundamental nature of the mechanism by developing a theory based on the quantum dynamics of the Floquet ladder, which is in excellent agreement with the data. Furthermore, we show how the technique finds applications in the accurate electrostatic characterisation of semiconductor quantum dots.
ISSN:2331-8422