Parallel two-qubit entangling gates via a quantum nondemolition interaction controlled by rotation

IF 2.9 2区物理与天体物理 Q2 Physics and Astronomy

Physical Review A Pub Date : 2024-09-18 DOI:10.1103/physreva.110.032616

E. A. Vashukevich, T. Yu. Golubeva

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引用次数: 0

Abstract

The paper presents an analysis of entangling and nonlocal operations in a quantum nondemolition (QND) interaction between multimode light with orbital angular momentum and an atomic ensemble. A protocol consists of two QND operations with rotations of quadratures of atomic spin coherence and light between them. This protocol provides a wide range of two-qubit operations, while the multimode nature of the chosen degrees of freedom allows the implementation of parallel operations over multiple two-qubit systems. We have used the formalism of equivalence classes and local invariants to evaluate the properties of two-qubit transformations. It is shown that, when selecting suitable values of the governing parameters, such as the duration of each of the two QND interactions and the rotation angles of the qubits, the protocol allows to realize a deterministic nonlocal SWAP operation and entangling

\sqrt{SWAP}

operation with probability

\frac{1}{3}

Abstract Image

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通过旋转控制的量子非爆破相互作用实现并行双量子比特纠缠门

本文分析了具有轨道角动量的多模光与原子集合之间的量子非爆破（QND）相互作用中的纠缠和非局部操作。一个协议由两个 QND 操作组成，原子自旋相干性和光的四次方在它们之间旋转。该协议提供了广泛的双量子比特操作，而所选自由度的多模性质允许在多个双量子比特系统上实施并行操作。我们使用等价类和局部不变式的形式来评估双量子比特变换的特性。结果表明，在选择合适的管理参数值（如两个 QND 相互作用的持续时间和量子比特的旋转角度）时，该协议可以实现确定性非局部 SWAP 操作和纠缠 SWAP 操作，概率为 13。

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来源期刊

Physical Review A 物理-光学

CiteScore

5.40

自引率

24.10%

发文量

审稿时长

2.2 months

期刊介绍： Physical Review A (PRA) publishes important developments in the rapidly evolving areas of atomic, molecular, and optical (AMO) physics, quantum information, and related fundamental concepts. PRA covers atomic, molecular, and optical physics, foundations of quantum mechanics, and quantum information, including: -Fundamental concepts -Quantum information -Atomic and molecular structure and dynamics; high-precision measurement -Atomic and molecular collisions and interactions -Atomic and molecular processes in external fields, including interactions with strong fields and short pulses -Matter waves and collective properties of cold atoms and molecules -Quantum optics, physics of lasers, nonlinear optics, and classical optics