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EnglishWe examine the possibility that pertinent impurities in a condensed matter system may help in designing quantum devices with enhanced coherent behaviors. For this purpose, we analyze a field theory model describing Y-shaped superconducting Josephson networks. We show that a new finite coupling stable infrared fixed point emerges in its phase diagram; we then explicitly show that, when engineered to operate near this new fixed point, Y-shaped networks support two-level quantum systems, for which the entanglement with the environment is frustrated.We briefly address the potential relevance of this result for engineering finite-size superconducting devices with enhanced quantum coherence. Our approach uses boundary conformal field theory since it naturally allows for a field theoretical treatment of the phase slips (instantons), describing the quantum tunneling between degenerate levels.
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| Titolo: | Frustration of Decoherence in Y-Shaped Superconducting Josephson Networks. |
| Autori: | |
| Data di pubblicazione: | 2008 |
| Rivista: | |
| Abstract: | We examine the possibility that pertinent impurities in a condensed matter system may help in designing quantum devices with enhanced coherent behaviors. For this purpose, we analyze a field theory model describing Y-shaped superconducting Josephson networks. We show that a new finite coupling stable infrared fixed point emerges in its phase diagram; we then explicitly show that, when engineered to operate near this new fixed point, Y-shaped networks support two-level quantum systems, for which the entanglement with the environment is frustrated.We briefly address the potential relevance of this result for engineering finite-size superconducting devices with enhanced quantum coherence. Our approach uses boundary conformal field theory since it naturally allows for a field theoretical treatment of the phase slips (instantons), describing the quantum tunneling between degenerate levels. |
| Handle: | http://hdl.handle.net/11391/36054 |
| Appare nelle tipologie: | 1.1 Articolo in rivista |
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