期刊
PHYSICAL REVIEW LETTERS
卷 114, 期 17, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.114.170503
关键词
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资金
- European Union's Seventh Framework Programme FP7 under REA [287252, 247743, 279781]
- Idex [ANR-10-IDEX-0001-02 PSL]
- Region Nord-Pas-de-Calais
- EPSRC through a DTA
- Materials World Network [EP/I035536/1]
- Royal Society
- EPSRC [EP/I035536/1, EP/K025945/1, EP/I035536/2] Funding Source: UKRI
- European Research Council (ERC) [279781] Funding Source: European Research Council (ERC)
- Engineering and Physical Sciences Research Council [EP/I035536/1, 1106292, EP/I035536/2, EP/K025945/1] Funding Source: researchfish
Interfacing between various elements of a computer-from memory to processors to long range communication-will be as critical for quantum computers as it is for classical computers today. Paramagnetic rare-earth doped crystals, such as Nd3+:Y2SiO5(YSO), are excellent candidates for such a quantum interface: they are known to exhibit long optical coherence lifetimes (for communication via optical photons), possess a nuclear spin (memory), and have in addition an electron spin that can offer hybrid coupling with superconducting qubits (processing). Here we study two of these three elements, demonstrating coherent storage and retrieval between electron and Nd-145 nuclear spin states in Nd3+:YSO. We find nuclear spin coherence times can reach 9 ms at similar to 5 K, about 2 orders of magnitude longer than the electron spin coherence, while quantum state and process tomography of the storage or retrieval operation between the electron and nuclear spin reveal an average state fidelity of 0.86. The times and fidelities are expected to further improve at lower temperatures and with more homogeneous radio-frequency excitation.
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