تقرير
A Universal Theory of Spin Squeezing
| العنوان: | A Universal Theory of Spin Squeezing |
|---|---|
| المؤلفون: | Block, Maxwell, Ye, Bingtian, Roberts, Brenden, Chern, Sabrina, Wu, Weijie, Wang, Zilin, Pollet, Lode, Davis, Emily J., Halperin, Bertrand I., Yao, Norman Y. |
| سنة النشر: | 2023 |
| المجموعة: | Condensed Matter Physics (Other) Quantum Physics |
| مصطلحات موضوعية: | Quantum Physics, Condensed Matter - Quantum Gases, Condensed Matter - Strongly Correlated Electrons, Physics - Atomic Physics |
| الوصف: | We provide extensive numerical and analytic evidence for the following conjecture: Any Hamiltonian exhibiting finite temperature, easy-plane ferromagnetism (XY order) can be used to generate scalable spin squeezing, and thus to perform quantum-enhanced sensing. Our conjecture is guided by a deep connection between the quantum Fisher information of pure states and the spontaneous breaking of a continuous symmetry. We demonstrate that spin-squeezing exhibits a phase diagram with a sharp transition between scalable squeezing and non-squeezing. This transition coincides with the equilibrium phase boundary for XY order at a finite temperature. In the scalable squeezing phase, we predict a sensitivity scaling as $N^{-7/10}$, between the standard quantum limit, $N^{-1/2}$, and that achieved in all-to-all coupled easy-plane spin models, $N^{-5/6}$. Our results provide fundamental insight into the landscape of Hamiltonians that can be used to generate metrologically useful quantum states. Comment: 6 pages, 3 figures + 12 pages, 6 figures |
| نوع الوثيقة: | Working Paper |
| URL الوصول: | http://arxiv.org/abs/2301.09636 |
| رقم الأكسشن: | edsarx.2301.09636 |
| قاعدة البيانات: | arXiv |
| الوصف غير متاح. |