Related papers: Long-lived metastable-qubit memory

Long-lived metastable-qubit memory

URL: http://arxiv.org/abs/2408.00975v2
Date: Sun, 18 Aug 2024 19:56:25 GMT
Title: Long-lived metastable-qubit memory
Authors: Xiaoyang Shi, Jasmine Sinanan-Singh, Kyle DeBry, Susanna L. Todaro, Isaac L. Chuang, John Chiaverini,
Abstract summary: Long coherence times have been demonstrated in trapped-ion qubits. Recent research suggests qubits encoded in metastable states could provide architectural benefits.
Score: 0.0
License: http://creativecommons.org/licenses/by/4.0/
Abstract: Coherent storage of quantum information is crucial to many quantum technologies. Long coherence times have been demonstrated in trapped-ion qubits, typically using the hyperfine levels within the ground state of a single ion. However, recent research suggests qubits encoded in metastable states could provide architectural benefits for quantum information processing, such as the possibility of effective dual-species operation in a single-species system and erasure-error conversion for fault-tolerant quantum computing. Here we demonstrate long-lived encoding of a quantum state in the metastable states of a trapped ion. By sympathetically cooling with another ion of the same species and constantly monitoring for erasure errors, we demonstrate a coherence time of 136(42) seconds with a qubit encoded in the metastable $5D_{5/2}$ state of a single $^{137}$Ba$^+$ ion. In agreement with a model based on empirical results from dynamical-decoupling-based noise spectroscopy, we find that dephasing of the metastable levels is the dominant source of error once erasure errors are removed.

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