https://doi.org/10.1140/epjp/s13360-025-06741-y
Regular Article
Enhancing mechanical entanglement in molecular optomechanics
1
Department of Physics, Faculty of Science, University of Yaounde I, P.O.Box 812, Yaounde, Cameroon
2
Department of Physics, Faculty of Science, University of Ngaoundere, P.O.Box 454, Ngaoundere, Cameroon
3
Stellenbosch Institute for Advanced Study (STIAS), Wallenberg Research Centre at Stellenbosch University, 7600, Stellenbosch, South Africa
4
Department of Physics, College of Sciences, University of Bisha, 61922, Bisha, Saudi Arabia
5
Department of Mathematics, College of Science and Humanities in Al-Kharj, Prince Sattam bin Abdulaziz University, 11942, Al-Kharj, Saudi Arabia
6
Hourani Center for Applied Scientific Research, Al-Ahliyya Amman University, Amman, Jordan
a
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Received:
1
April
2025
Accepted:
7
August
2025
Published online:
27
August
2025
Abstract
We propose a scheme for enhancing bipartite quantum entanglement in a double-cavity molecular optomechanical system (McOM) incorporating an intracavity optical parametric amplifier (OPA). Utilizing a set of linearized quantum Langevin equations and numerical simulations, we investigate the impact of the OPA on both optical-vibration and vibration-vibration entanglement. Our key findings reveal a counterintuitive trade-off: while the OPA significantly enhances vibration-vibration entanglement, a critical resource for quantum memories and transducers, it simultaneously suppresses optical-vibration entanglement, essential for quantum state transfer and readout. We demonstrate that maximal vibration-vibration entanglement is achieved when the molecular collective vibrational modes are symmetrically populated, providing a clear experimental guideline for optimizing entanglement sources. In particular, the vibration-vibration entanglement generated in our OPA-enhanced McOM system exhibits remarkable robustness to thermal noise, persisting at temperatures approaching e3 K, significantly exceeding conventional optomechanical systems in terms of thermal robustness, and highlighting the potential for room temperature quantum information processing. These results establish a promising theoretical foundation for OPA-enhanced McOM systems as a robust and scalable platform for quantum technologies, paving the way for future experimental implementations and advanced quantum information processing applications.
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© The Author(s), under exclusive licence to Società Italiana di Fisica and Springer-Verlag GmbH Germany, part of Springer Nature 2025
Springer Nature or its licensor (e.g. a society or other partner) holds exclusive rights to this article under a publishing agreement with the author(s) or other rightsholder(s); author self-archiving of the accepted manuscript version of this article is solely governed by the terms of such publishing agreement and applicable law.
