dorsal/arxiv
View SchemaStudies on Entanglement in Nuclear and Electron Spin Systems for Quantum Computing
| Authors | Robabeh Rahimi |
|---|---|
| Categories | |
| ArXiv ID | quant-ph/0609063 |
| URL | https://arxiv.org/abs/quant-ph/0609063 |
Abstract
In this work, we have been working on the concept of quantum entanglement. At first, we studied the theory of entanglement in its characterization and measurement, introducing a new scheme for detection of entanglement. The new approach links molecular-spin entities involving nuclear spins to quantum computing as more appropriate physical systems of interest. Then, we continued with the realization of entanglement in experiments. NMR has been the first choice due to its well approved advantages for quantum computing. NMR, however, has not been an appropriate system for demonstrating entangled states. Through a mathematical proof, NMR with low spin polarization has been invalidated for true implementations of non-local quantum algorithms, particularly supserdense coding. The point is that high spin polarization is inevitably required to acquire entanglement while in the current NMR it has been a formidable task to get highly polarized nuclear spins. In order to acquire high spin polarization, introducing electron spins can be much effective because of its three-order-of-magnitude larger gyromagnetic ratio compared to nuclear spins. Electron Nuclear DOuble Resonance (ENDOR) is spin manipulation technology that enables us to deal with both electron and nuclear spins. Thus, in this context, it can be more appropriate device for quantum computing. We emphasize that (pseudo)entanglement and interconversion between the entangled states have been realized with ENDOR on extremely stable organic molecular-spin entities. The required experimental conditions to obtain true quantum entanglement are also discussed. The appropriate entanglement witness for the corresponding ensemble quantum computing is introduced and examined.
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"abstract": "In this work, we have been working on the concept of quantum entanglement. At\nfirst, we studied the theory of entanglement in its characterization and\nmeasurement, introducing a new scheme for detection of entanglement. The new\napproach links molecular-spin entities involving nuclear spins to quantum\ncomputing as more appropriate physical systems of interest. Then, we continued\nwith the realization of entanglement in experiments. NMR has been the first\nchoice due to its well approved advantages for quantum computing. NMR, however,\nhas not been an appropriate system for demonstrating entangled states. Through\na mathematical proof, NMR with low spin polarization has been invalidated for\ntrue implementations of non-local quantum algorithms, particularly supserdense\ncoding. The point is that high spin polarization is inevitably required to\nacquire entanglement while in the current NMR it has been a formidable task to\nget highly polarized nuclear spins. In order to acquire high spin polarization,\nintroducing electron spins can be much effective because of its\nthree-order-of-magnitude larger gyromagnetic ratio compared to nuclear spins.\nElectron Nuclear DOuble Resonance (ENDOR) is spin manipulation technology that\nenables us to deal with both electron and nuclear spins. Thus, in this context,\nit can be more appropriate device for quantum computing. We emphasize that\n(pseudo)entanglement and interconversion between the entangled states have been\nrealized with ENDOR on extremely stable organic molecular-spin entities. The\nrequired experimental conditions to obtain true quantum entanglement are also\ndiscussed. The appropriate entanglement witness for the corresponding ensemble\nquantum computing is introduced and examined.",
"arxiv_id": "quant-ph/0609063",
"authors": [
"Robabeh Rahimi"
],
"categories": [
"quant-ph"
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"title": "Studies on Entanglement in Nuclear and Electron Spin Systems for Quantum Computing",
"url": "https://arxiv.org/abs/quant-ph/0609063"
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