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Coupled activity-current fluctuations in open quantum systems under strong symmetries
dc.contributor.author | Manzano Diosdado, Daniel | |
dc.contributor.author | Martínez García, M. A. | |
dc.contributor.author | Hurtado Fernández, Pablo Ignacio | |
dc.date.accessioned | 2021-09-23T07:27:44Z | |
dc.date.available | 2021-09-23T07:27:44Z | |
dc.date.issued | 2021-07-28 | |
dc.identifier.citation | D Manzano et al 2021 New J. Phys. 23 073044. [https://doi.org/10.1088/1367-2630/ac0f19] | es_ES |
dc.identifier.uri | http://hdl.handle.net/10481/70386 | |
dc.description | We acknowledge the Spanish Ministry and Agencia Estatal de Investigacion (AEI) through Grant FIS2017-84256-P (European Regional Development Fund), as well as the Consejeria de Conocimiento, Investigacion y Universidad, Junta de Andalucia and European Regional Development Fund, Ref. A-FQM-175-UGR18 and SOMM17/6105/UGR for financial support. We are also grateful for the computational resources and assistance provided by PROTEUS, the supercomputing center of Institute Carlos I for Theoretical and Computational Physics at the University of Granada, Spain. | es_ES |
dc.description.abstract | Strong symmetries in open quantum systems lead to broken ergodicity and the emergence of multiple degenerate steady states. From a quantum jump (trajectory) perspective, the appearance of multiple steady states is related to underlying dynamical phase transitions (DPTs) at the fluctuating level, leading to a dynamical coexistence of different transport channels classified by symmetry. In this paper we investigate how strong symmetries affect both the transport properties and the activity patterns of a particular class of Markovian open quantum system, a three-qubit model under the action of a magnetic field and in contact with a thermal bath.We find a pair of twin DPTs in exciton current statistics, induced by the strong symmetry and related by time reversibility, where a zero-current exchange-antisymmetric phase coexists with a symmetric phase of negative exciton current. On the other hand, the activity statistics exhibits a single DPT where the symmetric and antisymmetric phases of different but nonzero activities dynamically coexists. Interestingly, the maximum current and maximum activity phases do not coincide for this three-qubits system. We also investigate how symmetries are reflected in the joint large deviation statistics of the activity and the current, a central issue in the characterization of the complex quantum jump dynamics. The presence of a strong symmetry under nonequilibrium conditions implies non-analyticities in the dynamical free energy in the dual activity-current plane (or equivalently in the joint activity-current large deviation function), including an activity-driven current lockdown phase for activities below some critical threshold. Remarkably, the DPT predicted around the steady state and its Gallavotti–Cohen twin dual are extended into lines of first-order DPTs in the current-activity plane, with a nontrivial structure which depends on the transport and activity properties of each of the symmetry phases. Finally, we also study the effect of a symmetry-breaking, ergodicity-restoring dephasing channel on the coupled activity-current statistics for this model. Interestingly, we observe that while this dephasing noise destroys the symmetry-induced DPTs, the underlying topological symmetry leaves a dynamical fingerprint in the form of an intermittent, bursty on/off dynamics between the different symmetry sectors. | es_ES |
dc.description.sponsorship | Spanish Ministry and Agencia Estatal de Investigacion (AEI) FIS2017-84256-P | es_ES |
dc.description.sponsorship | Junta de Andalucia | es_ES |
dc.description.sponsorship | European Commission A-FQM-175-UGR18 SOMM17/6105/UGR | es_ES |
dc.language.iso | eng | es_ES |
dc.publisher | Institute of Physics Publishing | es_ES |
dc.rights | Atribución 3.0 España | * |
dc.rights.uri | http://creativecommons.org/licenses/by/3.0/es/ | * |
dc.subject | Fluctuations (Physics) | es_ES |
dc.subject | Spins | es_ES |
dc.subject | Large deviations | es_ES |
dc.subject | Non-equilibrium | es_ES |
dc.subject | Quantum open systems | es_ES |
dc.title | Coupled activity-current fluctuations in open quantum systems under strong symmetries | es_ES |
dc.type | journal article | es_ES |
dc.rights.accessRights | open access | es_ES |
dc.identifier.doi | 10.1088/1367-2630/ac0f19 | |
dc.type.hasVersion | VoR | es_ES |