当前位置: X-MOL 学术Chin. Phys. B › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Protecting the entanglement of two-qubit over quantum channels with memory via weak measurement and quantum measurement reversalProject supported by the Natural Science Foundation of Shandong Province, China (Grant No. ZR2017MF040).
Chinese Physics B ( IF 1.5 ) Pub Date : 2020-11-10 , DOI: 10.1088/1674-1056/aba614
Mei-Jiao Wang 1 , Yun- Jie Xia 2, 3 , Yang Yang 1 , Liao-Zhen Cao 1 , Qin-Wei Zhang 1 , Ying-De Li 1 , Jia-Qiang Zhao 1
Affiliation  

Based on the quantum technique of the weak measurement and quantum measurement reversal (WMR), we propose a scheme to protect entanglement for an entangled two-qubit pure state from four typical quantum noise channels with memory, i.e., the amplitude damping channel, the phase damping channel, the bit flip channel, and the depolarizing channel. For a given initial state | ψ 〉 = a| 00 〉 + d| 11 〉, it is found that the WMR operation indeed helps to protect entanglement from the above four quantum channels with memory, and the protection effect of WMR scheme is better when the coefficient a is small. For the other initial state | ϕ 〉 = b| 01 〉 + c| 10 〉, the effect of the protection scheme is the same regardless of the coefficient b and the WMR operation can protect entanglement in the amplitude damping channel with memory. Moreover, the protection of entanglement in quantum noise channels without memory in contrast to the results of the channels with memory is more effective. For | ψ 〉 or | ϕ 〉, we also find that the memory parameters play a significant role in the suppression of entanglement sudden death and the initial entanglement can be drastically amplified. Another more important result is that the relationship between the concurrence, the memory parameter, the weak measurement strength, and quantum measurement reversal strength is found through calculation and discussion. It provides a strong basis for the system to maintain maximum entanglement in the nosie channel.



中文翻译:

山东省自然科学基金项目(批准号ZR2017MF040)通过弱测量和量子测量反转保护具有记忆的两个量子通道上的纠缠。

基于弱测量和量子测量反转(WMR)的量子技术,我们提出了一种保护纠缠的双量子比特纯态纠缠免受四个典型的具有记忆的量子噪声通道,幅度阻尼通道,相位阻尼通道、位翻转通道和去极化通道。对于给定的初始状态 | ψ > =一个| 00 〉 + d | 11>,发现WMR操作确实有助于保护上述四个带有记忆的量子通道的纠缠,并且当系数a较小时,WMR方案的保护效果更好。对于其他初始状态 | φ〉 = b | 01〉+ c| 10>,无论系数b如何,保护方案的效果都是相同的,并且WMR操作可以保护具有记忆的幅度阻尼通道中的纠缠。此外,与有记忆的通道相比,没有记忆的量子噪声通道对纠缠的保护更有效。对于 | ψ > 或 | φ〉,我们还发现记忆参数在抑制纠缠猝死方面发挥了重要作用,并且初始纠缠可以被急剧放大。另一个更重要的结果是通过计算和讨论发现了并发、记忆参数、弱测量强度和量子测量反转强度之间的关系。它为系统在nosie通道中保持最大纠缠提供了强有力的基础。

更新日期:2020-11-10
down
wechat
bug