Integrated conversion and photodetection of virtual photons in an ultrastrongly coupled superconducting quantum circuit

The ground-state of an artificial atom ultrastrongly coupled to quantized modes is entangled and contains an arbitrary number of virtual photons. The problem of their detection has been raised since the very birth of the field but despite the theoretical efforts still awaits experimental demonstrati...

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Bibliographic Details
Published in:arXiv.org 2024-04
Main Authors: Giannelli, Luigi, Anfuso, Giorgio, Grajcar, Miroslav, Gheorghe Sorin Paraoanu, Paladino, Elisabetta, Falci, Giuseppe
Format: Article
Language:English
Subjects:
Circuits
Coupled modes
Photons
Quantum dots
Online Access:Get full text
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Summary:The ground-state of an artificial atom ultrastrongly coupled to quantized modes is entangled and contains an arbitrary number of virtual photons. The problem of their detection has been raised since the very birth of the field but despite the theoretical efforts still awaits experimental demonstration. Recently experimental problems have been addressed in detail showing that they can be overcome by combining an unconventional design of the artificial atom with advanced coherent control. In this work we study a simple scheme of control-integrated continuous measurement which makes remarkably favourable the tradeoff between measurement efficiency and backaction showing that the unambiguous detection of virtual photons can be achieved within state-of-the art quantum technologies.
ISSN:2331-8422
DOI:10.48550/arxiv.2306.05200