Journal article · Preprint article
Collective Quantum Memory Activated by a Driven Central Spin
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.
Language: | English |
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Year: | 2019 |
Pages: | 140502 |
ISSN: | 10797114 and 00319007 |
Types: | Journal article and Preprint article |
DOI: | 10.1103/physrevlett.123.140502 |
ORCIDs: | Mørk, Jesper and 0000-0002-6455-2168 |