Fast three-qubit Toffoli quantum gate based on the three-body Förster resonances in Rydberg atoms

One-step implementation of Toffoli gate for neutral atoms based on unconventional Rydberg pumping

Compared with the idea of universal quantum computation, a direct synthesis of a multiqubit logic gate can greatly improve the efficiency of quantum information processing tasks. Here we propose an efficient scheme to implement a three-qubit controlled-not (Toffoli) gate of neutral atoms based on unconventional Rydberg pumping. By adjusting the strengths of Rabi frequencies of driving fields, the Toffoli gate can be achieved within one step, which is also insensitive to the fluctuation of the Rydberg-Rydberg interaction. Considering different atom alignments, we can obtain a high-fidelity Toff…

基于Rydberg原子中三体精细结构态变的Toffoli门

Toffoli gate based on a three-body fine-structure-state-changing Förster resonance in Rydberg atoms

基于Rydberg原子中三体精细结构态变的Forster共振，实现了一种保真度超过99%的三量子比特Toffoli门。

利用里德堡耦合与暗态共振在中性原子平台实现Toffoli门与C$^\ ext{n}$NOT（n$>2$）门

Toffoli and C$^\text{n}$NOT (n$>2$) gates in a neutral-atom platform using Rydberg coupling and dark state resonances

本文提出在中性原子光镊平台利用里德堡强相互作用和暗态共振实现高保真Toffoli门，并借助里德堡反阻塞机制扩展实现多控制比特C$^\ ext{n}$NOT门，为量子计算中的多量子比特受控操作提供新途径。

Deutsch, Toffoli, and CNOT Gates via Rydberg Blockade of Neutral Atoms

Universal quantum gates and quantum error correction~(QEC) lie in the heart of quantum information science. Large-scale quantum computing depends on a universal set of quantum gates, in which some gates may be easily carried out, while others are hard with a certain physical system. There is a unique three-qubit quantum gate called the Deutsch gate~[$\mathbb{D}(θ)$], from which alone a circuit can be constructed so that any feasible quantum computing is attainable. As far as we know, however, $\mathbb{D}(θ)$ has not been demonstrated. Here we design an easily realizable $\mathbb{D}(θ)$ by usin…

Spheroidal-structure-based multi-qubit Toffoli gate via asymmetric Rydberg interaction

We propose an exotic multi-qubit Toffoli gate protocol via asymmetric Rydberg blockade, benefiting from the use of a spheroidal configuration to optimize the gate performance. The merit of a spheroidal structure lies in a well preservation of strong blocked energies between all control-target atom pairs within the sphere, which can persistently keep the blockade error at a low level. On the basis of optimization for three different types of $(2+1)$-$qubit$ gate units to minimize the antiblockade error, the gate fidelity of an optimal $(6+1)$-$qubit$ configuration can attain as high as $0.9841$…

Multiqubit Toffoli gates and optimal geometry with Rydberg atoms

Due to its potential for implementing a scalable quantum computer, multiqubit Toffoli gate lies in the heart of quantum information processing. In this article, we demonstrate a multiqubit blockade gate with atoms arranged in a three-dimension spheroidal array. The gate performance is greatly improved by the method of optimizing control-qubit distributions on the spherical surface via evolutionary algorithm, which leads to an enhanced asymmetric Rydberg blockade. This spheroidal configuration, not only arises a well preservation for the dipole blockade energy between arbitrary control-target p…