Multiple-spin coherence transfer in linear Ising spin chains and beyond: Numerically optimized pulses and experiments
| Autor: | Jorge L. Neves, Kavita Dorai, Haidong Yuan, Robert Zeier, Navin Khaneja, S. Begam Elavarasi, Manoj Nimbalkar, Steffen J. Glaser |
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| Rok vydání: | 2012 |
| Předmět: | |
| Zdroj: | Physical Review A. 85 |
| ISSN: | 1094-1622 1050-2947 |
| DOI: | 10.1103/physreva.85.012325 |
| Popis: | We study multiple-spin coherence transfers in linear Ising spin chains with nearest neighbor couplings. These constitute a model for efficient information transfers in future quantum computing devices and for many multi-dimensional experiments for the assignment of complex spectra in nuclear magnetic resonance spectroscopy. We complement prior analytic techniques for multiple-spin coherence transfers with a systematic numerical study where we obtain strong evidence that a certain analytically-motivated family of restricted controls is sufficient for time-optimality. In the case of a linear three-spin system, additional evidence suggests that prior analytic pulse sequences using this family of restricted controls are time-optimal even for arbitrary local controls. In addition, we compare the pulse sequences for linear Ising spin chains to pulse sequences for more realistic spin systems with additional long-range couplings between non-adjacent spins. We experimentally implement the derived pulse sequences in three and four spin systems and demonstrate that they are applicable in realistic settings under relaxation and experimental imperfections-in particular-by deriving broadband pulse sequences which are robust with respect to frequency offsets. 11 pages |
| Databáze: | OpenAIRE |
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