Roadmap on quantum nanotechnologies

Journal article

We investigate the generation of steady-state entanglement between two atoms resulting from the fluctuation-mediated Casimir-Polder (CP) interactions near a surface. Starting with an initially separable state of the atoms, we analyze the atom-atom entanglement dynamics for atoms placed at distances in the range of $\sim25$ nm away from a planar medium, examining the effect of medium properties and geometrical configuration of the atomic dipoles. We show that perfectly conducting and superconducting surfaces yield an optimal steady-state concurrence value of approximately 0.5. Furthermore, although the generated entanglement decreases with medium losses for a metal surface, we identify an optimal distance from the metal surface that assists in entanglement generation by the surface. While fluctuation-mediated interactions are typically considered detrimental to the coherence of quantum systems at nanoscales, our results demonstrate a mechanism for leveraging such interactions for entanglement generation.Comment: 7 pages, 3 figure

Authors: Laucht, A; Hohls, F; Ubbelohde, N; Gonzalez-Zalba, MF; Reilly, DJ

• Publication status: Published
• Peer review status: Peer reviewed
• Publisher: IOP Publishing
• Journal: Nanotechnology
• Volume: 32
• Issue: 16
• Pages: 162003-162003
• Publication date: 2021-02-05
• DOI: 10.1088/1361-6528/abb333
• EISSN: 1361-6528
• ISSN: 0957-4484
• Language: English
• Keywords: Gallium arsenide; Quantum mechanics; Fabrication; Coupling (piping); Optoelectronics; Quantum dot; Quantum computer; Materials science; Qubit; Physics; Quantum; Nanotechnology; Quantum entanglement; Quantum channel; Quantum teleportation; Spin (aerodynamics)