Academic Journal
أعرض في EDS

Steering witnesses for unknown Gaussian quantum states

التفاصيل البيبلوغرافية
العنوان: Steering witnesses for unknown Gaussian quantum states
المؤلفون: Tatiana Mihaescu, Hermann Kampermann, Aurelian Isar, Dagmar Bruß
المصدر: New Journal of Physics, Vol 25, Iss 11, p 113023 (2023)
بيانات النشر: IOP Publishing, 2023.
سنة النشر: 2023
المجموعة: LCC:Science
LCC:Physics
مصطلحات موضوعية: quantum steering, Gaussian states, steering witnesses, covariance matrices, Science, Physics, QC1-999
الوصف: We define and fully characterize the witnesses based on second moments detecting steering in Gaussian states by means of Gaussian measurements. All such tests, which arise from linear combination of variances or second moments of canonical operators, are easily implemented in experiments. We propose also a set of linear constraints fully characterizing steering witnesses when the steered party has one bosonic mode, while in the general case the constraints restrict the set of tests detecting steering. Given an unknown quantum state we implement a semidefinite program providing the appropriate steering test with respect to the number of random measurements performed. Thus, it is a ‘repeat-until-success’ method allowing for steering detection with less measurements than in full tomography. We study the efficiency of steering detection for two-mode squeezed vacuum states, for two-mode general unknown states, and for three-mode continuous variable GHZ states. In addition, we discuss the robustness of this method to statistical errors.
نوع الوثيقة: article
وصف الملف: electronic resource
اللغة: English
تدمد: 1367-2630
Relation: https://doaj.org/toc/1367-2630
DOI: 10.1088/1367-2630/ad0a4f
URL الوصول: https://doaj.org/article/885dc803b9814390a9dff7e395b55246
رقم الانضمام: edsdoj.885dc803b9814390a9dff7e395b55246
قاعدة البيانات: Directory of Open Access Journals
الوصف
تدمد:13672630
DOI:10.1088/1367-2630/ad0a4f