Protecting the entanglement of two-qubit over quantum channels with memory via weak measurement and

来源 :中国物理B(英文版) | 被引量 : 0次 | 上传用户:fh1130
下载到本地 , 更方便阅读
声明 : 本文档内容版权归属内容提供方 , 如果您对本文有版权争议 , 可与客服联系进行内容授权或下架
论文部分内容阅读
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 | y> = 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 |y)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.
其他文献
We design an actively tunable polarization-sensitive multiband absorber in the mid-infrared region,which consists of stacked graphene multilayers separated by d
一年来本省的文教工作,是在党政领导的重视下,以贯彻中央「整顿巩固,重点发展,提高质量,稳步前进」的文教工作总方针为中心,逐步展开的。年初,省、专区、县(市)分别召开了文
We present new lemmas,theorem and corollaries to construct interactions among higher-order rogue waves,n-periodic waves and n-solitons solutions(n → ∞)to the(
会议
Graphitic carbon nitride (g-C3N4) has recently been received much attention in the field of photocatalysis such as hydrogen evolution [1], CO2 reduction [2] and
会议
Bell-Plesset(BP)effect caused perturbation growth plays an important role in better understanding of characteristics of the convergence effect.Governing equatio
Excitable media,such as cells,can be polarized and magnetized in the presence of an external electromagnetic field.In fact,distinct geometric deformation can be