تقرير
Controlling dephasing of coupled qubits via shared-bath coherence
| العنوان: | Controlling dephasing of coupled qubits via shared-bath coherence |
|---|---|
| المؤلفون: | Hall, L. M. J., Sirkina, L. S., Morreau, A., Langbein, W., Muljarov, E. A. |
| سنة النشر: | 2024 |
| المجموعة: | Condensed Matter Quantum Physics |
| مصطلحات موضوعية: | Condensed Matter - Mesoscale and Nanoscale Physics, Quantum Physics |
| الوصف: | The interaction of a quantum system with its environment limits qubit coherence times and restricts its utility in quantum information processing applications. In this Letter, we show that the decoherence of a coupled qubit system can be minimized, or even eliminated by exploiting the quantum coherence of the bath itself. We investigate the dephasing in a system of two spatially separated, electronically decoupled qubits, with direct or mediated coupling, interacting with a shared bath. For illustration we treat F\"orster or cavity-mediated coupling between semiconductor quantum dots interacting with acoustic phonons. Using the rigorous method of Trotter's decomposition with cumulant expansion, we demonstrate a reduction in the dephasing rates at specific distances. This control is a coherent effect of the shared bath and is absent for independent baths. It can be understood in terms of phonon-assisted transitions between the entangled qubit states of the coupled system. Comment: 6 pages, 4 figures |
| نوع الوثيقة: | Working Paper |
| URL الوصول: | http://arxiv.org/abs/2405.14685 |
| رقم الأكسشن: | edsarx.2405.14685 |
| قاعدة البيانات: | arXiv |
| الوصف غير متاح. |