dorsal/arxiv
View SchemaRoom temperature coherent control of coupled single spins in solid
| Authors | T. Gaebel, M. Domhan, I. Popa, C. Wittmann, P. Neumann, F. Jelezko, J. R. Rabeau, N. Stavrias, A. D. Greentree, S. Prawer, J. Meijer, J. Twamley, P. R. Hemmer, J. Wrachtrup |
|---|---|
| Categories | |
| ArXiv ID | quant-ph/0605038 |
| URL | https://arxiv.org/abs/quant-ph/0605038 |
| DOI | 10.1038/nphys318 |
| Journal | Nature Physics 2: 408-413 (2006) |
Abstract
Coherent coupling between single quantum objects is at the heart of modern quantum physics. When coupling is strong enough to prevail over decoherence, it can be used for the engineering of correlated quantum states. Especially for solid-state systems, control of quantum correlations has attracted widespread attention because of applications in quantum computing. Such coherent coupling has been demonstrated in a variety of systems at low temperature1, 2. Of all quantum systems, spins are potentially the most important, because they offer very long phase memories, sometimes even at room temperature. Although precise control of spins is well established in conventional magnetic resonance3, 4, existing techniques usually do not allow the readout of single spins because of limited sensitivity. In this paper, we explore dipolar magnetic coupling between two single defects in diamond (nitrogen-vacancy and nitrogen) using optical readout of the single nitrogen-vacancy spin states. Long phase memory combined with a defect separation of a few lattice spacings allow us to explore the strong magnetic coupling regime. As the two-defect system was well-isolated from other defects, the long phase memory times of the single spins was not diminished, despite the fact that dipolar interactions are usually seen as undesirable sources of decoherence. A coherent superposition of spin pair quantum states was achieved. The dipolar coupling was used to transfer spin polarisation from a nitrogen-vacancy centre spin to a nitrogen spin, with optical pumping of a nitrogen-vacancy centre leading to efficient initialisation. At the level anticrossing efficient nuclear spin polarisation was achieved. Our results demonstrate an important step towards controlled spin coupling and multi-particle entanglement in the solid state.
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"abstract": "Coherent coupling between single quantum objects is at the heart of modern\nquantum physics. When coupling is strong enough to prevail over decoherence, it\ncan be used for the engineering of correlated quantum states. Especially for\nsolid-state systems, control of quantum correlations has attracted widespread\nattention because of applications in quantum computing. Such coherent coupling\nhas been demonstrated in a variety of systems at low temperature1, 2. Of all\nquantum systems, spins are potentially the most important, because they offer\nvery long phase memories, sometimes even at room temperature. Although precise\ncontrol of spins is well established in conventional magnetic resonance3, 4,\nexisting techniques usually do not allow the readout of single spins because of\nlimited sensitivity. In this paper, we explore dipolar magnetic coupling\nbetween two single defects in diamond (nitrogen-vacancy and nitrogen) using\noptical readout of the single nitrogen-vacancy spin states. Long phase memory\ncombined with a defect separation of a few lattice spacings allow us to explore\nthe strong magnetic coupling regime. As the two-defect system was well-isolated\nfrom other defects, the long phase memory times of the single spins was not\ndiminished, despite the fact that dipolar interactions are usually seen as\nundesirable sources of decoherence. A coherent superposition of spin pair\nquantum states was achieved. The dipolar coupling was used to transfer spin\npolarisation from a nitrogen-vacancy centre spin to a nitrogen spin, with\noptical pumping of a nitrogen-vacancy centre leading to efficient\ninitialisation. At the level anticrossing efficient nuclear spin polarisation\nwas achieved. Our results demonstrate an important step towards controlled spin\ncoupling and multi-particle entanglement in the solid state.",
"arxiv_id": "quant-ph/0605038",
"authors": [
"T. Gaebel",
"M. Domhan",
"I. Popa",
"C. Wittmann",
"P. Neumann",
"F. Jelezko",
"J. R. Rabeau",
"N. Stavrias",
"A. D. Greentree",
"S. Prawer",
"J. Meijer",
"J. Twamley",
"P. R. Hemmer",
"J. Wrachtrup"
],
"categories": [
"quant-ph"
],
"doi": "10.1038/nphys318",
"journal_ref": "Nature Physics 2: 408-413 (2006)",
"title": "Room temperature coherent control of coupled single spins in solid",
"url": "https://arxiv.org/abs/quant-ph/0605038"
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