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Measurement-free preparation of grid states

التفاصيل البيبلوغرافية
العنوان: Measurement-free preparation of grid states
المؤلفون: Jacob Hastrup, Kimin Park, Jonatan Bohr Brask, Radim Filip, Ulrik Lund Andersen
المصدر: npj Quantum Information, Vol 7, Iss 1, Pp 1-8 (2021)
بيانات النشر: Nature Portfolio, 2021.
سنة النشر: 2021
المجموعة: LCC:Physics
LCC:Electronic computers. Computer science
مصطلحات موضوعية: Physics, QC1-999, Electronic computers. Computer science, QA75.5-76.95
الوصف: Abstract Quantum computing potentially offers exponential speed-ups over classical computing for certain tasks. A central, outstanding challenge to making quantum computing practical is to achieve fault tolerance, meaning that computations of any length or size can be realized in the presence of noise. The Gottesman-Kitaev-Preskill code is a promising approach toward fault-tolerant quantum computing, encoding logical qubits into grid states of harmonic oscillators. However, for the code to be fault tolerant, the quality of the grid states has to be extremely high. Approximate grid states have recently been realized experimentally, but their quality is still insufficient for fault tolerance. Current implementable protocols for generating grid states rely on measurements of ancillary qubits combined with either postselection or feed forward. Implementing such measurements take up significant time during which the states decohere, thus limiting their quality. Here, we propose a measurement-free preparation protocol, which deterministically prepares arbitrary logical grid states with a rectangular or hexagonal lattice. The protocol can be readily implemented in trapped-ion or superconducting-circuit platforms to generate high-quality grid states using only a few interactions, even with the noise levels found in current systems.
نوع الوثيقة: article
وصف الملف: electronic resource
اللغة: English
تدمد: 2056-6387
Relation: https://doaj.org/toc/2056-6387
DOI: 10.1038/s41534-020-00353-3
URL الوصول: https://doaj.org/article/7d84d30d46bc46f8a8d4762f97e73b14
رقم الانضمام: edsdoj.7d84d30d46bc46f8a8d4762f97e73b14
قاعدة البيانات: Directory of Open Access Journals
الوصف
تدمد:20566387
DOI:10.1038/s41534-020-00353-3