Dynamics of Many-Body Photon Bound States in Chiral Waveguide QED

We theoretically study the few- and many-body dynamics of photons in chiral waveguides. In particular, we examine pulse propagation through an ensemble of N two-level systems chirally coupled to a waveguide. We show that the system supports correlated multiphoton bound states, which have a well-defi...

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Autores principales:	Sahand Mahmoodian, Giuseppe Calajó, Darrick E. Chang, Klemens Hammerer, Anders S. Sørensen
Formato:	article
Lenguaje:	EN
Publicado:	American Physical Society 2020
Materias:	Physics QC1-999
Acceso en línea:	https://doaj.org/article/99fed851a39842b9ad6c54866e9006de
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spelling	oai:doaj.org-article:99fed851a39842b9ad6c54866e9006de2021-12-02T11:31:26ZDynamics of Many-Body Photon Bound States in Chiral Waveguide QED10.1103/PhysRevX.10.0310112160-3308https://doaj.org/article/99fed851a39842b9ad6c54866e9006de2020-07-01T00:00:00Zhttp://doi.org/10.1103/PhysRevX.10.031011http://doi.org/10.1103/PhysRevX.10.031011https://doaj.org/toc/2160-3308We theoretically study the few- and many-body dynamics of photons in chiral waveguides. In particular, we examine pulse propagation through an ensemble of N two-level systems chirally coupled to a waveguide. We show that the system supports correlated multiphoton bound states, which have a well-defined photon number n and propagate through the system with a group delay scaling as 1/n^{2}. This has the interesting consequence that, during propagation, an incident coherent-state pulse breaks up into different bound-state components that can become spatially separated at the output in a sufficiently long system. For sufficiently many photons and sufficiently short systems, we show that linear combinations of n-body bound states recover the well-known phenomenon of mean-field solitons in self-induced transparency. Our work thus covers the entire spectrum from few-photon quantum propagation, to genuine quantum many-body (atom and photon) phenomena, and ultimately the quantum-to-classical transition. Finally, we demonstrate that the bound states can undergo elastic scattering with additional photons. Together, our results demonstrate that photon bound states are truly distinct physical objects emerging from the most elementary light-matter interaction between photons and two-level emitters. Our work opens the door to studying quantum many-body physics and soliton physics with photons in chiral waveguide QED.Sahand MahmoodianGiuseppe CalajóDarrick E. ChangKlemens HammererAnders S. SørensenAmerican Physical SocietyarticlePhysicsQC1-999ENPhysical Review X, Vol 10, Iss 3, p 031011 (2020)
institution	DOAJ
collection	DOAJ
language	EN
topic	Physics QC1-999
spellingShingle	Physics QC1-999 Sahand Mahmoodian Giuseppe Calajó Darrick E. Chang Klemens Hammerer Anders S. Sørensen Dynamics of Many-Body Photon Bound States in Chiral Waveguide QED
description	We theoretically study the few- and many-body dynamics of photons in chiral waveguides. In particular, we examine pulse propagation through an ensemble of N two-level systems chirally coupled to a waveguide. We show that the system supports correlated multiphoton bound states, which have a well-defined photon number n and propagate through the system with a group delay scaling as 1/n^{2}. This has the interesting consequence that, during propagation, an incident coherent-state pulse breaks up into different bound-state components that can become spatially separated at the output in a sufficiently long system. For sufficiently many photons and sufficiently short systems, we show that linear combinations of n-body bound states recover the well-known phenomenon of mean-field solitons in self-induced transparency. Our work thus covers the entire spectrum from few-photon quantum propagation, to genuine quantum many-body (atom and photon) phenomena, and ultimately the quantum-to-classical transition. Finally, we demonstrate that the bound states can undergo elastic scattering with additional photons. Together, our results demonstrate that photon bound states are truly distinct physical objects emerging from the most elementary light-matter interaction between photons and two-level emitters. Our work opens the door to studying quantum many-body physics and soliton physics with photons in chiral waveguide QED.
format	article
author	Sahand Mahmoodian Giuseppe Calajó Darrick E. Chang Klemens Hammerer Anders S. Sørensen
author_facet	Sahand Mahmoodian Giuseppe Calajó Darrick E. Chang Klemens Hammerer Anders S. Sørensen
author_sort	Sahand Mahmoodian
title	Dynamics of Many-Body Photon Bound States in Chiral Waveguide QED
title_short	Dynamics of Many-Body Photon Bound States in Chiral Waveguide QED
title_full	Dynamics of Many-Body Photon Bound States in Chiral Waveguide QED
title_fullStr	Dynamics of Many-Body Photon Bound States in Chiral Waveguide QED
title_full_unstemmed	Dynamics of Many-Body Photon Bound States in Chiral Waveguide QED
title_sort	dynamics of many-body photon bound states in chiral waveguide qed
publisher	American Physical Society
publishDate	2020
url	https://doaj.org/article/99fed851a39842b9ad6c54866e9006de
work_keys_str_mv	AT sahandmahmoodian dynamicsofmanybodyphotonboundstatesinchiralwaveguideqed AT giuseppecalajo dynamicsofmanybodyphotonboundstatesinchiralwaveguideqed AT darrickechang dynamicsofmanybodyphotonboundstatesinchiralwaveguideqed AT klemenshammerer dynamicsofmanybodyphotonboundstatesinchiralwaveguideqed AT andersssørensen dynamicsofmanybodyphotonboundstatesinchiralwaveguideqed
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Dynamics of Many-Body Photon Bound States in Chiral Waveguide QED

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