Collective Quantum Memory Activated by a Driven Central Spin

Emil Vosmar Denning, Dorian A. Gangloff, Mete Atatüre, Jesper Mørk, Claire Le Gall

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Abstract

Coupling a qubit coherently to an ensemble is the basis for collective quantum memories. A single driven electron in a quantum dot can deterministically excite low-energy collective modes of a nuclear spin ensemble in the presence of lattice strain. We propose to gate a quantum state transfer between this central electron and these low-energy excitations - spin waves - in the presence of a strong magnetic field, where the nuclear coherence time is long. We develop a microscopic theory capable of calculating the exact time evolution of the strained electron-nuclear system. With this, we evaluate the operation of quantum state storage and show that fidelities up to 90% can be reached with a modest nuclear polarization of only 50%. These findings demonstrate that strain-enabled nuclear spin waves are a highly suitable candidate for quantum memory.
Original languageEnglish
Article number140502
JournalPhysical Review Letters
Volume123
Issue number14
Number of pages5
ISSN0031-9007
DOIs
Publication statusPublished - 2019

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