Discrete-variable assisted error correction of continuous-variable quantum information

• URL: http://arxiv.org/abs/2604.06565v1
• Date: Wed, 08 Apr 2026 01:28:54 GMT
• Title: Discrete-variable assisted error correction of continuous-variable quantum information
• Abstract summary: We propose a novel continuous-variable quantum error correction scheme.<n>Our scheme extracts information about CV displacement to the DV ancilla, measuring that allows counteracting the unwanted displacement error.<n>By concatenating with DV QEC codes, our scheme is robust against the physical errors in hybrid CV-DV systems.
• Score: 0.2523415604068923
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Robust continuous-variable (CV) quantum information processing requires correcting realistic errors in bosonic systems, but all existing schemes rely on auxiliary Gottesman-Kitaev-Preskill (GKP) states which the preparation and operation are demanding in many platforms. In this work, we propose a novel CV quantum error correction (QEC) scheme that utilizes a broadly accessible resource: discrete-variable (DV) ancilla. Our scheme extracts information about CV displacement to the DV ancilla, measuring that allows counteracting the unwanted displacement error. We show that a simple single-qubit ancilla can already suppress CV infidelity by more than 20%. By concatenating with DV QEC codes, our scheme is robust against the physical errors in hybrid CV-DV systems, and yields a new class of oscillator-in-oscillator code that does not involve GKP states. Our work facilitates the implementation of CV QEC on realistic platforms.

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