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Article overview
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Overview of Quantum Memory Protection and Adiabaticity Induction by Fast-Signal Control | | Jun Jing
; Lian-Ao Wu
; | | Date: |
4 Dec 2014 | | Abstract: | A quantum memory or information processing device is subject to dis- turbance
from its surrounding environment or inevitable leakage due to its contact with
other systems. To tackle these problems, several control protocols have been
proposed for quantum memory or storage. Among them, the fast-signal control or
dynamical decoupling based on external pulse sequences provides a prevailing
strategy aimed at suppressing decoherence and preventing the target systems
from the leakage or diffusion process. In this paper, we review the
applications of this protocol in protecting quantum memory under the
non-Markovian dissipative noise and maintaining systems on finite speed
adiabatic passages without leakage there- from. We analyze leakage and control
perturbative and nonperturbative dynamical equations including second-order
master equation, quantum-state-diffusion equa- tion, and one-component master
equation derived from Feshbach PQ-partitioning technique. It turns out that the
quality of fast-modulated signal control is insensi- tive to configurations of
the applied pulse sequences. Specifically, decoherence and leakage will be
greatly suppressed as long as the control sequence is able to effec- tively
shift the system beyond the bath cutoff frequency, almost independent of the
details of the control sequences which could be ideal pulses, regular
rectangular pulses, random pulses and even noisy pulses. | | Source: | arXiv, 1412.1783 | | Services: | Forum | Review | PDF | Favorites | |
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