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EnglishIn this paper, we provide a simple strategy to optimize the performances of a spin chain as a quantum channel for state transfer. We investigate the most general conditions under which a long range interacting chain achieves the highest fidelity and the shortest transfer time. In this respect, we show that the symmetry of the spin chain plays a key role to identify the ideal system, which involves the sender and receiver only, and provide numerical evidence. However, the two-spin ideal chain is unpractical due to the decrease of the coupling strength with the distance. Therefore we show how to design a spin chain, which nearly approaches the optimal behavior, while keeping the coupling strength reasonably high.
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| Titolo: | Spin-chains as quantum channels for qubit-state transfer |
| Autori: | |
| Data di pubblicazione: | 2009 |
| Abstract: | In this paper, we provide a simple strategy to optimize the performances of a spin chain as a quantum channel for state transfer. We investigate the most general conditions under which a long range interacting chain achieves the highest fidelity and the shortest transfer time. In this respect, we show that the symmetry of the spin chain plays a key role to identify the ideal system, which involves the sender and receiver only, and provide numerical evidence. However, the two-spin ideal chain is unpractical due to the decrease of the coupling strength with the distance. Therefore we show how to design a spin chain, which nearly approaches the optimal behavior, while keeping the coupling strength reasonably high. |
| Handle: | http://hdl.handle.net/11581/108388 |
| ISBN: | 9781424433490 |
| Appare nelle tipologie: | Contributo in atto di convegno su volume |
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