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理论物理通讯：英文版

A Simple Scheme for Realizing a Multiqubit Controlled-Phase Gate Through a Resonant Interaction of Three-Level Atoms with a Single-Mode Cavity

张登玉, 唐世清, 谢利军, 詹孝贵, 游开明, 高峰

Published Jan 1, 2010• 0 citations
OpenAlex

Abstract

一个很简单的理论计划被建议仅仅用在梯子类型之间的一个单个反响的相互作用第一实现 two-qubit 和 three-qubit 控制阶段门三水平的原子和单个模式的洞。在介绍协议，量信息在原子的稳定的地面状态上被编码(作为控制 qubits ) 并且零光子并且洞地的一个光子 Fock 状态(作为目标 qubit ) 。在原子自发的排放，洞模式的腐烂，和联合力量的偏差的影响下面， three-qubit 控制阶段门可以有一比较地高保真度。被扩大认识到 N-qubit 控制阶段门也被讨论的控制阶段门和盒子的试验性的可行性。

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理论物理通讯：英文版•Jan 1, 2010•0 citations
一个很简单的理论计划被建议仅仅用在梯子类型之间的一个单个反响的相互作用第一实现 two-qubit 和 three-qubit 控制阶段门三水平的原子和单个模式的洞。在介绍协议，量信息在原子的稳定的地面状态上被编码(作为控制 qubits ) 并且零光子并且洞地的一个光子 Fock 状态(作为目标 qubit ) 。在原子自发的排放，洞模式的腐烂，和联合力量的偏差的影响下面， three-qubit 控制阶段门可以有一比较地高保真度。被扩大认识到 N-qubit 控制阶段门也被讨论的控制阶段门和盒子的试验性的可行性。
We propose a way to realize a multiqubit controlled-phase gate with one qubit simultaneously controlling n target qubits using atoms in cavity QED. In this proposal, there is no need to use classical pulses during the entire gate operation. The gate operation time scales as |n\sqrt {n}n​| only and thus the gate can be performed faster when compared with sending atoms through the cavity one at a time. In addition, only three operational steps are required to realize this n-target-qubit controlled-phase gate. This proposal is quite general and can be applied to other physical systems, such as various superconducting qubits coupled to a resonator, NV centers coupled to a microsphere cavity, or quantum dots in cavity QED.
We present a way to realize a 3-qubit quantum controlled-phase gate with superconducting qubit systems coupled to a cavity. This proposal does not require adjustment of the qubit level spacings or identical qubit-cavity coupling constants. Moreover, since only a resonant interaction is applied, the gate can be performed fast, within ∼ 10 nanosecond. This proposal is quite general, which can be applied to various types of superconducting qubits, atoms trapped in a cavity, or quantum dots coupled to a resonator.
Heralded near-deterministic multiqubit controlled-phase gates with integrated error detection have recently been proposed by Borregaard et al. [Phys. Rev. Lett. 114, 110502 (2015)]. This protocol is based on a single four-level atom (a heralding quartit) and NNN three-level atoms (operational qutrits) coupled to a single-resonator mode acting as a cavity bus. Here we generalize this method for two distant resonators without the cavity bus between the heralding and operational atoms. Specifically, we analyze the two-qubit controlled-ZZZ gate and its multiqubit-controlled generalization (i.e., a Toffoli-like gate) acting on the two-lowest levels of NNN qutrits inside one resonator, with their successful actions being heralded by an auxiliary microwave-driven quartit inside the other resonator. Moreover, we propose a circuit-quantum-electrodynamics realization of the protocol with flux and phase qudits in linearly coupled transmission-line resonators with dissipation. These methods offer a quadratic fidelity improvement compared to cavity-assisted deterministic gates.