تقرير
Practical quantum metrology with large precision gains in the low photon number regime
| العنوان: | Practical quantum metrology with large precision gains in the low photon number regime |
|---|---|
| المؤلفون: | Knott, P. A., Proctor, T. J., Hayes, A. J., Cooling, J. P., Dunningham, J. A. |
| المصدر: | Phys. Rev. A 93, 033859 (2016) |
| سنة النشر: | 2015 |
| المجموعة: | Quantum Physics |
| مصطلحات موضوعية: | Quantum Physics |
| الوصف: | Quantum metrology exploits quantum correlations to make precise measurements with limited particle numbers. By utilizing inter- and intra- mode correlations in an optical interferometer, we find a state that combines entanglement and squeezing to give a 7-fold enhancement in the quantum Fisher information (QFI) -- a metric related to the precision -- over the shot noise limit, for low photon numbers. Motivated by practicality we then look at the squeezed cat-state, which has recently been made experimentally, and shows further precision gains over the shot noise limit and a 3-fold improvement in the QFI over the optimal Gaussian state. We present a conceptually simple measurement scheme that saturates the QFI, and we demonstrate a robustness to loss for small photon numbers. The squeezed cat-state can therefore give a significant precision enhancement in optical quantum metrology in practical and realistic conditions. Comment: 9 pages, 4 figures |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.1103/PhysRevA.93.033859 |
| URL الوصول: | http://arxiv.org/abs/1505.04011 |
| رقم الأكسشن: | edsarx.1505.04011 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.1103/PhysRevA.93.033859 |
|---|