000109079 001__ 109079
000109079 005__ 20230519145453.0
000109079 0247_ $$2doi$$a10.1103/PhysRevA.104.053701
000109079 0248_ $$2sideral$$a125152
000109079 037__ $$aART-2021-125152
000109079 041__ $$aeng
000109079 100__ $$0(orcid)0000-0002-1734-1405$$aGonzález-Gutiérrez, Carlos A.$$uUniversidad de Zaragoza
000109079 245__ $$aDistant emitters in ultrastrong waveguide QED: Ground-state properties and non-Markovian dynamics
000109079 260__ $$c2021
000109079 5060_ $$aAccess copy available to the general public$$fUnrestricted
000109079 5203_ $$aStarting from the paradigmatic spin-boson model (SBM), we investigate the static and dynamical properties of a system of two distant two-level emitters coupled to a one-dimensional Ohmic waveguide beyond the rotating wave approximation. Employing static and dynamical polaron Ansätze we study the effects of finite separation distance on the behavior of the photon-mediated Ising-like interaction, qubit frequency renormalization, ground-state magnetization, and entanglement entropy of the two-qubit system. Based on previous works we derive an effective approximate Hamiltonian for the two-impurity SBM that preserves the excitation-number and thus facilitates the analytical treatment. In particular, it allows us to introduce non-Markovianity arising from delay-feedback effects in two distant emitters in the so-called ultrastrong coupling (USC) regime. We test our results with numerical simulations performed over a discretized circuit-QED model, finding perfect agreement with previous results, and showing interesting dynamical effects arising in ultrastrong waveguide QED with distant emitters. In particular, we revisit the Fermi two-atom problem showing that, in the USC regime, initial correlations yield two different evolutions for symmetric and antisymmetric states even before the emitters become causally connected. Finally, we demonstrate that the collective dynamics, e.g., superradiance or subradiance, are affected not only by the distance between emitters, but also by the coupling, due to significant frequency renormalization. This constitutes another dynamical consequence of the USC regime.
000109079 536__ $$9info:eu-repo/grantAgreement/ES/DGA/E09-17R-Q-MAD$$9info:eu-repo/grantAgreement/EC/H2020/731473/EU/QuantERA ERA-NET Cofund in Quantum Technologies/QuantERA$$9This project has received funding from the European Union’s Horizon 2020 research and innovation program under grant agreement No H2020 731473-QuantERA$$9info:eu-repo/grantAgreement/EC/H2020/862893/EU/Molecular spin qudits offering new hope for quantum computing/FATMOLS$$9This project has received funding from the European Union’s Horizon 2020 research and innovation program under grant agreement No H2020 862893-FATMOLS$$9info:eu-repo/grantAgreement/ES/MINECO/MAT2017-88358-C3-1-R$$9info:eu-repo/grantAgreement/EUR/MOLSPIN-COST/CA15128
000109079 540__ $$9info:eu-repo/semantics/openAccess$$aAll rights reserved$$uhttp://www.europeana.eu/rights/rr-f/
000109079 590__ $$a2.971$$b2021
000109079 592__ $$a1.183$$b2021
000109079 594__ $$a5.7$$b2021
000109079 591__ $$aPHYSICS, ATOMIC, MOLECULAR & CHEMICAL$$b13 / 36 = 0.361$$c2021$$dQ2$$eT2
000109079 593__ $$aAtomic and Molecular Physics, and Optics$$c2021$$dQ1
000109079 591__ $$aOPTICS$$b41 / 101 = 0.406$$c2021$$dQ2$$eT2
000109079 655_4 $$ainfo:eu-repo/semantics/article$$vinfo:eu-repo/semantics/publishedVersion
000109079 700__ $$0(orcid)0000-0003-2995-6615$$aRomán-Roche, Juan
000109079 700__ $$0(orcid)0000-0003-4478-1948$$aZueco, David
000109079 7102_ $$12003$$2395$$aUniversidad de Zaragoza$$bDpto. Física Materia Condensa.$$cÁrea Física Materia Condensada
000109079 773__ $$g104, 5 (2021), 053701 [14 pp.]$$pPhys. rev., A$$tPhysical Review A$$x2469-9926
000109079 8564_ $$s1313019$$uhttps://zaguan.unizar.es/record/109079/files/texto_completo.pdf$$yVersión publicada
000109079 8564_ $$s3156849$$uhttps://zaguan.unizar.es/record/109079/files/texto_completo.jpg?subformat=icon$$xicon$$yVersión publicada
000109079 909CO $$ooai:zaguan.unizar.es:109079$$particulos$$pdriver
000109079 951__ $$a2023-05-18-14:48:30
000109079 980__ $$aARTICLE