Memory-assisted decoder for approximate Gottesman-Kitaev-Preskill codes
File(s)PhysRevResearch.2.043280.pdf (903.36 KB)
Published version
Author(s)
Wan, Kwok Ho
Neville, Alex
Kolthammer, WS
Type
Journal Article
Abstract
We propose a quantum error correction protocol for continuous-variable finite-energy, approximate Gottesman-Kitaev-Preskill (GKP) states undergoing small Gaussian random displacement errors, based on the scheme of Glancy and Knill [Phys. Rev. A 73, 012325 (2006)]. We show that combining multiple rounds of error-syndrome extraction with Bayesian estimation offers enhanced protection of GKP-encoded qubits over comparible single-round approaches. Furthermore, we show that the expected total displacement error incurred in multiple rounds of error followed by syndrome extraction is bounded by 2√π. By recompiling the syndrome-extraction circuits, we show that all squeezing operations can be subsumed into auxiliary state preparation, reducing them to beamsplitter transformations and quadrature measurements.
Date Issued
2020-11-01
Date Acceptance
2020-08-18
Citation
Physical Review Research, 2020, 2 (4)
ISSN
2643-1564
Publisher
American Physical Society
Journal / Book Title
Physical Review Research
Volume
2
Issue
4
Copyright Statement
© 2020 The Author(s). Published by the American Physical Society under the terms of theCreative Commons Attribution 4.0 Internationallicense. Furtherdistribution of this work must maintain attribution to the author(s)and the published article’s title, journal citation, and DOI.
License URL
Sponsor
Engineering & Physical Science Research Council (E
Identifier
http://arxiv.org/abs/1912.00829v2
Grant Number
EP/T001062/1
Subjects
quant-ph
quant-ph
Publication Status
Published
Article Number
ARTN 043280
Date Publish Online
2020-11-24