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

Author:

Giannelli LuigiORCID,Anfuso Giorgio,Grajcar Miroslav,Paraoanu Gheorghe Sorin,Paladino Elisabetta,Falci Giuseppe

Abstract

AbstractThe 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 favorable 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.

Funder

QuantERA

PNRR MUR

ICSC HPC

Università di Catania

COST Action

Accademy of Finland

Università degli Studi di Catania

Publisher

Springer Science and Business Media LLC

Subject

Physical and Theoretical Chemistry,General Physics and Astronomy,General Materials Science

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