Persistent entanglement of valley exciton qubits in transition metal dichalcogenides integrated into a bimodal optical cavity

We report dissipative dynamics of two valley excitons residing in the \(K\) and \(K^\prime\)-valleys of bare WSe\(_2\) monolayer and the one being integrated into a bimodal optical cavity. In the former, only when the exciton-field detunings in the \(K\) and \(K^\prime\)-valleys are rigorously equal...

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Bibliographic Details
Published in:arXiv.org 2022-09
Main Authors: Borges, H S, Júnior, Celso A N, Brandão, David S, Liu, Fujun, Pereira, V V R, Xie, S J, Qu, Fanyao, Alcalde, A M
Format: Article
Language:English
Subjects:
Entangled states
Entanglement
Excitons
Monolayers
Subsystems
Transition metal compounds
Valleys
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Summary:We report dissipative dynamics of two valley excitons residing in the \(K\) and \(K^\prime\)-valleys of bare WSe\(_2\) monolayer and the one being integrated into a bimodal optical cavity. In the former, only when the exciton-field detunings in the \(K\) and \(K^\prime\)-valleys are rigorously equal (resonant detuning), partially entangled stationary states can be created. Otherwise the concurrence of exciton qubits turns to zero. Remarkably, in the latter (the WSe\(_2\) monolayer in a bimodal optical cavity), the transfers of entanglement from one subsystem (exciton/light) to the other (light/exciton) take place. Hence a finite stationary concurrence of exciton qubits is always generated, independent of whether the exciton-field detuning in two valleys is resonant or non-resonant. In addition, it can even reach as high as 1 (maximally entangled state of two valley excitons). Since there no real system which has a strictly resonant detuning, an immersion of the WSe\(_2\) monolayer in a bimodal optical cavity provides an opportunity to overcome the challenge facing by the bare WSe\(_2\), opening a novel realm of potential qubits.
ISSN:2331-8422