Academic Journal
Sequences of information backflow in local dephasing channels with spectral gaps.
| Τίτλος: | Sequences of information backflow in local dephasing channels with spectral gaps. |
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| Συγγραφείς: | Giraldi, Filippo1,2 filgi@liberto.it |
| Πηγή: | International Journal of Quantum Information. Oct2017, Vol. 15 Issue 7, p1-20. 20p. |
| Θεματικοί όροι: | *Quantum information theory, *Spectral sequences (Mathematics), *Data flow computing, *Infinity (Mathematics), *Markov spectrum |
| Περίληψη: | The flow of quantum information in local dephasing channels is analyzed over short and long times in case the structured reservoir of frequency modes exhibits a spectral gap in the density of modes over low frequencies. The presence of the low-frequency gap with upper cut-off frequency ωg produces an infinite sequence of long-time intervals over which information backflow appears. Though generally irregular, the time intervals exhibit, under certain conditions, upper bounds: the nth episode of information backflow has already started at the instant π(2n π 1)=ωg, and already ended at the instant 2πn=ωg, for every n = 1; 2; . ... The intervals become regular over long times, tend to the asymptotic length π=ωg, as the supremum value, and are described analytically in terms of the structure of the spectral density near the upper cut-off frequency of the spectral gap. Consequently, engineering structured reservoirs of frequency modes with a spectral gap over low frequencies produces in local dephasing channels regular sequences of information backflow and recoherence over long times, along with non-Markovian evolution. [ABSTRACT FROM AUTHOR] |
| Βάση Δεδομένων: | Academic Search Index |
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