High-fidelity spin readout via the double latching mechanism

IF 6.6 1区 物理与天体物理 Q1 PHYSICS, APPLIED npj Quantum Information Pub Date : 2024-10-03 DOI:10.1038/s41534-024-00882-1
Haruki Kiyama, Danny van Hien, Arne Ludwig, Andreas D. Wieck, Akira Oiwa
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Abstract

Projective measurement of single-electron spins, or spin readout, is among the most fundamental technologies for spin-based quantum information processing. Implementing spin readout with both high-fidelity and scalability is indispensable for developing fault-tolerant quantum computers in large-scale spin-qubit arrays. To achieve high fidelity, a latching mechanism is useful. However, the fidelity can be decreased by spin relaxation and charge state leakage, and the scalability is currently challenging. Here, we propose and demonstrate a double-latching high-fidelity spin readout scheme, which suppresses errors via an additional latching process. We experimentally show that the double-latching mechanism provides significantly higher fidelity than the conventional latching mechanism and estimate a potential spin readout fidelity of 99.94% using highly spin-dependent tunnel rates. Due to isolation from error-inducing processes, the double-latching mechanism combined with scalable charge readout is expected to be useful for large-scale spin-qubit arrays while maintaining high fidelity.

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通过双锁扣机制实现高保真自旋读数
单电子自旋的投射测量或自旋读出是基于自旋的量子信息处理的最基本技术之一。要在大规模自旋量子比特阵列中开发容错量子计算机,就必须实现高保真和可扩展的自旋读出。为了实现高保真,锁存机制非常有用。然而,自旋弛豫和电荷态泄漏会降低保真度,可扩展性目前也面临挑战。在这里,我们提出并演示了一种双锁存高保真自旋读出方案,该方案通过额外的锁存过程来抑制误差。我们的实验表明,双闩锁机制的保真度明显高于传统的闩锁机制,利用高度依赖自旋的隧道速率,我们估计自旋读出的潜在保真度可达 99.94%。由于与错误诱导过程隔离,双锁存机制与可扩展的电荷读出相结合,有望在保持高保真的同时适用于大规模自旋量子比特阵列。
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来源期刊
npj Quantum Information
npj Quantum Information Computer Science-Computer Science (miscellaneous)
CiteScore
13.70
自引率
3.90%
发文量
130
审稿时长
29 weeks
期刊介绍: The scope of npj Quantum Information spans across all relevant disciplines, fields, approaches and levels and so considers outstanding work ranging from fundamental research to applications and technologies.
期刊最新文献
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