Journal
PHYSICAL REVIEW LETTERS
Volume 123, Issue 14, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.123.140502
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Funding
- ERC PHOENICS grant [617985]
- EPSRC Quantum Technology Hub NQIT [EP/M013243/1]
- Royal Society [RGF/EA/181068]
- St. John's College Title A Fellowship
- Danish Council for Independent Research [DFF-4181-00416]
- Royal Society Dorothy Hodgkin Fellowship
- European Research Council (ERC) [617985] Funding Source: European Research Council (ERC)
- EPSRC [EP/M013243/1] Funding Source: UKRI
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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.
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