论文标题

在旋转量子计算体系结构中,包括具有广义全耦合相互作用的Dicke状态在内的自旋本征的量子状态制备

Quantum state preparation of spin eigenstates including the Dicke states with generalized all-coupled interaction in a spintronic quantum computing architecture

论文作者

Sharma, Amritesh, Tulapurkar, Ashwin A.

论文摘要

在使用多目标纠缠作为各种量子信息处理任务的资源方面,已经有了广泛的发展。在本文中,我们专注于准备任意旋转特征态,其子集包含重要的纠缠资源,例如迪克州以及其他难以准备的亚降低状态。利用这些状态的对称性,我们考虑了每对量子位之间的均匀成对交换耦合。从具有单个值状态的给定旋转本征的产品状态开始,可以使用简单的时间演变来制备另一个旋转本征态。这种扩展铺平了一种确定性的方法,可以在线性步骤中准备任意的dicke状态。我们讨论了对对数电路深度的W State确定性准备的先前工作的成本的改善。修改后的算法需要将旋转角动量泵入系统的几次迭代,类似于Grover搜索中的振幅扩增。作为证明所提出的方案的用例,我们选择了连接到铁磁储层的非相互作用静态旋转盘的系统。从储层中涌现出的飞行Qubits在本地与静态量子位相互作用,从而介导了所有对之间的直接交换相互作用。

There has been an extensive development in the use of multi-partite entanglement as a resource for various quantum information processing tasks. In this paper we focus on preparing arbitrary spin eigenstates whose subset contain important entangled resources like Dicke states as well as some other sub-radiant states that are difficult to prepare. Leveraging on the symmetry of these states we consider uniform pairwise exchange coupling between every pair of qubits. Starting from a product state of a given spin eigenstate with a single qubit state, another spin eigenstate can be prepared using simple time evolutions. This expansion paves a deterministic approach to prepare arbitrary Dicke states in linear steps. We discuss an improvement in this cost building up on a previous work for W states deterministic preparation in logarithmic circuit depth. The modified algorithm requires several iterations of pumping spin angular momentum into the system and is akin to the amplitude amplification in Grover search. As a use case to demonstrate the proposed scheme, we choose a system of non-interacting static spin qubits connected to a ferromagnetic reservoir. The flying qubits emerging from the reservoir locally interact with static qubits successively, mediating an in-direct exchange interaction between all the pairs.

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