Group delay controlled by the decoherence of a single artificial atom

The ability to slow down light at the single-photon level has applications in quantum information processing and other quantum technologies. We demonstrate two methods, both using just a single artificial atom, enabling dynamic control over microwave light velocities in waveguide quantum electrodyna...

Full description

Saved in:
Bibliographic Details
Published in:arXiv.org 2024-09
Main Authors: Y -T Cheng, K -M Hsieh, B -Y Wu, Niu, Z Q, Aziz, F, Y -H Huang, Wen, P Y, K -T Lin, Y -H Lin, Chen, J C, Kockum, A F, G -D Lin, Z -R Lin, Y Lu, I -C Hoi
Format: Article
Language:English
Subjects:
Data processing
Decay rate
Dynamic control
Group delay
Quantum dots
Quantum electrodynamics
Quantum phenomena
Waveguides
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:The ability to slow down light at the single-photon level has applications in quantum information processing and other quantum technologies. We demonstrate two methods, both using just a single artificial atom, enabling dynamic control over microwave light velocities in waveguide quantum electrodynamics (waveguide QED). Our methods are based on two distinct mechanisms harnessing the balance between radiative and non-radiative decay rates of a superconducting artificial atom in front of a mirror. In the first method, we tune the radiative decay of the atom using interference effects due to the mirror; in the second method, we pump the atom to control its non-radiative decay through the Autler--Townes effect. When the half the radiative decay rate exceeds the non-radiative decay rate, we observe positive group delay; conversely, dominance of the non-radiative decay rate results in negative group delay. Our results advance signal-processing capabilities in waveguide QED.
ISSN:2331-8422