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When a quantum system interacts with the environment its superposition or coherence can be lost. Thus there will be decoherence. Decoherence causes loss of information. For effective information processing the quantum states should be protected from decoherence. We employ weak measurement and measurement reversal to reduce decoherence in a single qubit quantum state interacting with the environmental noise due to amplitude damping. To study the variation in decoherence, the trace distance is investigated. The trace distances for different weak measurement strength ?m?, and decoherence magnitude ?D? are calculated. It is seen that through weak measurement and measurement reversal, decoherence in the system can be reduced considerably.
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[Navya S L and N Shaji. (2017); PROTECTION OF A SINGLE QUBIT QUANTUM STATE FROM DECOHERENCE. Int. J. of Adv. Res. 5 (Jun). 28-31] (ISSN 2320-5407). www.journalijar.com
Research Scholar, Department of Physics, Maharajas College, Ernakulam
