波导中的复用量子态传输

Guillermo F. Peñas, Ricardo Puebla, Juan José García-Ripoll
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引用次数: 0

摘要

在这篇文章中,我们考虑了量子网络的现实波导实现,将其作为一个测试平台,展示如何在 QED 设置中最大限度地存储和操纵量子信息。我们分析了使用波包工程和量子态传输协议的两种方法。首先,我们提出并设计了一系列时域正交光子。这些光子可以与不同的目标量子比特进行选择性交互。然而,采用谐振节点的模式复用在很大程度上会受到串扰效应的破坏。这就促使我们采用第二种方法,即频率复用。在这里,我们通过波导探索频率复用的极限,分析其在给定带宽内承载和忠实传输不同频率光子的能力。我们进行了详细的单光子和双光子模拟,并提供了现实条件下相干量子态传输协议保真度的理论界限。我们的结果表明,最先进的实验可以使用数十个多路复用光子,其全局保真度可以满足容错量子计算的要求。但前提是必须满足单光子保真度的条件。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Multiplexed quantum state transfer in waveguides

Multiplexed quantum state transfer in waveguides
In this article, we consider a realistic waveguide implementation of a quantum network that serves as a testbed to show how to maximize the storage and manipulation of quantum information in QED setups. We analyze two approaches using wavepacket engineering and quantum state transfer protocols. First, we propose and design a family of orthogonal photons in the time domain. These photons allow for a selective interaction with distinct targeted qubits. Yet, mode multiplexing employing resonant nodes is largely spoiled by cross-talk effects. This motivates the second approach, namely, frequency multiplexing. Here we explore the limits of frequency multiplexing through the waveguide, analyzing its capabilities to host and faithfully transmit photons of different frequencies within a given bandwidth. We perform detailed one- and two-photon simulations and provide theoretical bounds for the fidelity of coherent quantum state transfer protocols under realistic conditions. Our results show that state-of-the-art experiments can employ dozens of multiplexed photons with global fidelities fulfilling the requirements imposed by fault-tolerant quantum computing. This is with the caveat that the conditions for single-photon fidelity are met.
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CiteScore
8.60
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