Report
Symmetric inseparability and number entanglement in charge conserving mixed states
| العنوان: | Symmetric inseparability and number entanglement in charge conserving mixed states |
|---|---|
| المؤلفون: | Ma, Zhanyu, Han, Cheolhee, Meir, Yigal, Sela, Eran |
| المصدر: | PRA 105, 042416 (2022) |
| سنة النشر: | 2021 |
| المجموعة: | Condensed Matter Quantum Physics |
| مصطلحات موضوعية: | Quantum Physics, Condensed Matter - Mesoscale and Nanoscale Physics, Condensed Matter - Quantum Gases |
| الوصف: | We explore sufficient conditions for inseparability in mixed states with a globally conserved charge, such as a particle number. We argue that even separable states may contain entanglement in fixed charge sectors, as long as the state can not be separated into charge conserving components. As a witness of symmetric inseparability we study the number entanglement (NE), $\Delta S_m$, defined as the entropy change due to a subsystem's charge measurement. Whenever $\Delta S_m > 0$, there exist inseparable charge sectors, having finite (logarithmic) negativity, even when the full state is either separable or has vanishing negativity. We demonstrate that the NE is not only a witness of symmetric inseparability, but also an entanglement monotone. Finally, we study the scaling of $\Delta S_m$ in thermal 1D systems combining high temperature expansion and conformal field theory. Comment: The title was changed, journal reference added |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.1103/PhysRevA.105.042416 |
| URL الوصول: | http://arxiv.org/abs/2110.09388 |
| رقم الانضمام: | edsarx.2110.09388 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.1103/PhysRevA.105.042416 |
|---|