Sub-shot noise sensitivity via deformed four-headed kitten states
| Autor: | Akhtar, Naeem, Yang, Xiaosen, Peng, Jia-Xin, Haq, Inaam Ul, Xie, Yuee, Chen, Yuanping |
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| Rok vydání: | 2024 |
| Předmět: | |
| Druh dokumentu: | Working Paper |
| Popis: | The original compass state, created by superposing four coherent states, yields anisotropic sub-Planck structures and demonstrates enhanced sensitivity to perturbations, offering advantages for quantum sensing. We propose two variants of this compass state by simultaneously applying photon addition and subtraction in different orders: one with addition first and one with subtraction first to the state. Our variants display sub-Planck structures and improved sensitivity to displacements, with photon addition and subtraction influencing these characteristics. In our cases, adding photons increases the average photon number, while photon subtraction lowers it in the first case and has no effect in the second. Furthermore, an increment in the added number of photons uniformly reduces the size of sub-Planck structures, whereas increasing the number of photons subtracted from the state causes these sub-Planck structures to expand in size; higher photon addition improves sensitivity, while photon subtraction decreases it. Remarkably, under optimal parameters, our specific variants achieve isotropic sub-Planck structures and provide isotropic enhanced sensitivity across all directions, surpassing compass states. Comment: 14 pages, and 9 figures |
| Databáze: | arXiv |
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