Safeguarding Oscillators and Qudits with Distributed Two-Mode Squeezing
- URL: http://arxiv.org/abs/2402.05888v1
- Date: Thu, 8 Feb 2024 18:24:22 GMT
- Title: Safeguarding Oscillators and Qudits with Distributed Two-Mode Squeezing
- Authors: Anthony J. Brady, Jing Wu and Quntao Zhuang
- Abstract summary: Multimode Gottesman-Kitaev-Preskill (GKP) codes have shown great promise in enhancing the protection of both discrete and analog quantum information.
We provide a unique example where techniques from quantum sensing can be applied to improve multimode GKP codes.
Inspired by distributed quantum sensing, we propose the distributed two-mode squeezing (dtms) GKP codes that offer benefits in error correction with minimal active encoding operations.
- Score: 5.717368673366845
- License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
- Abstract: Recent advancements in multimode Gottesman-Kitaev-Preskill (GKP) codes have
shown great promise in enhancing the protection of both discrete and analog
quantum information. This broadened range of protection brings opportunities
beyond quantum computing to benefit quantum sensing by safeguarding squeezing
-- the essential resource in many quantum metrology protocols. However, it is
less explored how quantum sensing can benefit quantum error correction. In this
work, we provide a unique example where techniques from quantum sensing can be
applied to improve multimode GKP codes. Inspired by distributed quantum
sensing, we propose the distributed two-mode squeezing (dtms) GKP codes that
offer benefits in error correction with minimal active encoding operations. In
fact, the proposed codes rely on a single (active) two-mode squeezing element
and an array of beamsplitters that effectively distributes continuous-variable
correlations to many GKP ancillae, similar to continuous-variable distributed
quantum sensing. Despite this simple construction, the code distance achievable
with dtms-GKP qubit codes is comparable to previous results obtained through
brute-force numerical search [PRX Quantum 4, 040334 (2023)]. Moreover, these
codes enable analog noise suppression beyond that of the best-known two-mode
codes [Phys. Rev. Lett. 125, 080503 (2020)] without requiring an additional
squeezer. We also provide a simple two-stage decoder for the proposed codes,
which appears near-optimal for the case of two modes and permits analytical
evaluation.
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