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Poster Session

Poster Session II

4:00 pm – 6:00 pm, Wednesday June 18 Session H00 Oregon Convention Center, Exhibit Hall E
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Engineering impurity Bell states through coupling with a quantum bath

Poster 113
Presenter: Duong Anh-Tai Tran (Quantum System Unit, OIST Graduate School, and Homer L. Dodge Department of Physics and Astronomy, and Center for Quantum Research and Technology, The University of Oklahoma)
Authors: Thomás Fogarty (Quantum System Unit, OIST Graduate School, Onna, Okinawa 904-0495, Japan), Sergi de María-García (Instituto Universitario de Matemática Pura y Aplicada, Universitat Politècnica de València, E-46022 València, Spain), Thomas Busch (Quantum Systems Unit, OIST Graduate University, Onna, Okinawa 904-0495, Japan), Miguel A. García-March (Instituto Universitario de Matemática Pura y Aplicada, Universitat Politècnica de València, E-46022 València, Spain)

We theoretically demonstrate the feasibility of creating Bell states in multicomponent ultracold atomic gases by solely using the ability to control the interparticle interactions via Feshbach resonances. For this we consider two distinguishable impurities immersed in an atomic background cloud of a few bosons, with the entire system being confined in a one-dimensional harmonic trap. By analyzing the numerically obtained ground states we demonstrate that the two impurities can form spatially entangled bipolaron states due to mediated interactions from the bosonic bath. Our analysis is based on calculating the correlations between the two impurities in a two-mode basis, which is experimentally accessible by measuring the particle positions in the left or right sides of the trap. While interspecies interactions are crucial in order to create the strongly entangled impurity states, they can also inhibit correlations depending on the ordering of the impurities and three-body impurity-bath correlations. We show how these drawbacks can be mitigated by manipulating the properties of the bath, namely its size, mass, and intraspecies interactions, allowing one to create impurity Bell states over a wide range of impurity-impurity interactions.

Funding acknowledgement

This work is supported by the Okinawa Institute of Science and Technology Graduate University (OIST). T.F., T.B., and T.D.A.T. are grateful to JST Grant No. JPMJPF2221 and T.F. also acknowledges support from JSPS KAKENHI Grant No. JP23K03290. T.D.A.T. also acknowledges support through a Dodge Postdoctoral Fellowship. MAGM acknowledges support from the Ministry for Digital Transformation and of Civil Service of the Spanish Government through the QUANTUM ENIA project call - Quantum Spain project, and by the European Union through the Recovery, Transformation and Resilience Plan - NextGenerationEU within the framework of the Digital Spain 2026 Agenda: also  from Projects of MCIN with funding from European Union NextGenerationEU (PRTR-C17.I1) and by Generalitat Valenciana, with Ref. 20220883 (PerovsQuTe) and COMCUANTICA/007 (QuanTwin), and Red Tematica RED2022-134391-T.

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