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研究进展:非局域的非互易性

A nonlocal circulator protocol is proposed in hybrid optomechanical system. By analogy with quantum communication, using the input-output relationship, we establish the quantum channel between two optical modes with long-range.
The three body nonlocal interaction between the cavity and the two oscillators is obtained by eliminating the optomechanical cavity mode and verifying the Bell-CHSH inequality of continuous variables. By introducing the phase accumulation between cyclic interactions, the unidirectional transmission of quantum state between optical mode and two mechanical modes are achieved. The results show that nonreciprocal transmissions are achieved as long as the accumulated phase reaches a certain value. In addition, the effective interaction parameters in our system are amplified, which reduces the difficulty of the implementation of our protocol. Our research can provide potential applications for nonlocal manipulation and transmission control of quantum platforms.

研究进展:声-光量子态克隆

此为与华北电力大学穆青霞副教授合作的工作,先给出我们研究这个课题的目的:

Story line,
Information is stored in solid qubits (phonon), we need to readout a copy of the information in flying qubit (photon) for quantum information processing, and also need to keep the original information unchanged.

故事梗概大致就是这样的了。

接下来说一下背景:

对于经典信号而言,“复制粘贴”是十分简单也十分常见的操作。而对于未知的量子信号而言,由于不可克隆定理的限定,使得这一操作变得异常艰难。

那么怎样才能实现这个功能呢?学者们提出了很多量子克隆方案,有牺牲概率保存保真度的概率克隆,也有牺牲保真度保证克隆成功的普适克隆。总之,要实现克隆必须要有所牺牲。

然后就要说到量子信息的物理载体了,光子容易操控和传输是很好的飞行bit,但是很难存储,而固态bit,例如原子、超导等,又相对便于存储,但很难传输。所以我们需要将二者结合起来,说到固态bit和飞行bit的结合,这里就不得不提到一个系统——光力系统,它是连接声子和光子的天然桥梁,可以在频率相差悬殊的两个模式之间构建可观的耦合。

这个课题便是从这几个角度出发,以光力系统为平台研究声(固态bit)-光(飞行bit)之间量子态的“复制粘贴”。我们期望能在我们的方案能在光力系统平台上同时兼顾两类克隆手段,并能在存在耗散的情况下尽可能优的实现我们想做的事情。