Open AccessQuantum constraint dynamics and tracking control of a thermal dissipative qubit
Author(s) -
Jing-Min Zhu,
Shun-Jin Wang
Publication year - 2006
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.55.5018
Subject(s) - dissipative system , qubit , phase qubit , physics , constraint (computer aided design) , coherence (philosophical gambling strategy) , quantum , charge qubit , thermal reservoir , classical mechanics , quantum mechanics , mathematics , geometry , heat transfer , heat spreader
Quantum constraint dynamics and tracking control strategy to stabilize the coherence of a decoherent system is applied to a dissipative qubit system at a finite temperature. By using a control field dependent on the dynamical state of the qubit through the constraint equations, we show that the quantum state of the qubit can be preserved within a finite time duration by the feedback effect of the qubit system. It is also shown that the temperature plays a negative role in the control strategy.