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The '''Stimulated Raman adiabatic passage''' (STIRAP) process permits transfer of a population between two applicable [[quantum state]]s via at least two coherent [[Electromagnetic pulse|electromagnetic (light) pulses]]. These light pulses drive the transitions of the three level Ʌ [[atom]] or multilevel system.<ref>{{cite book | author= Heike Schwager. | title = A quantum memory for light in nuclear spin of quantum dot, p. 53, 2008}}</ref>

==Population transfer in three level Ʌ atom==
Consider the description of three level Ʌ atom having [[ground state]] <math>|g_1\rangle </math> and <math>|g_2\rangle </math> (for simplicity consider the energy of both ground states are same) and [[excited state]] <math>|e\rangle </math> respectively. Suppose in the beginning the total population is in the ground state <math>|g_1\rangle </math>. Here the logic for transformation of the population from ground state <math>|g_1\rangle </math> to <math>|g_2\rangle </math> is that initially the unpopulated states <math>|g_2\rangle </math> and <math>|e\rangle </math> couple, afterward superposition of state <math>|g_2\rangle </math> and <math>|e\rangle </math> couple to the state <math>|g_1\rangle </math>. Thereby a state is formed that permits the transformation of the population into state <math>|g_2\rangle </math> without populating the excited state <math>|e\rangle </math>. This process of transforming the population without populating the excited state is called the stimulated [[Raman]] adiabatic passage.<ref>{{cite journal |author=P. Marte, P. Zoller, J.L.Hall |title= Quantum state-mapping between multi-level atoms and cavity light fields, Phys. Rev A44 , 1991}}</ref>

==References==
{{reflist}}

[[Category:Quantum mechanics]]

Multiplicative sequence - Revision history

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