Abstract
We propose a scheme for creation and transfer of coherence among ground state and indirect exciton states of triple quantum dots via the technique of stimulated Raman adiabatic passage. Compared with the traditional stimulated Raman adiabatic passage, the Stokes laser pulse is replaced by the tunneling pulse, which can be controlled by the externally applied voltages. By varying the amplitudes and sequences of the pump and tunneling pulses, a complete coherence transfer or an equal coherence distribution among multiple states can be obtained. The investigations can provide further insight for the experimental development of controllable coherence transfer in semiconductor structure and may have potential applications in quantum information processing.
Highlights
Atomic coherence has attracted considerable interest in recent years because atomic coherence is essential for many effects, such as electromagnetically induced transparency (EIT) [1,2,3], laser without inversion [4,5,6], coherent population transfer [7,8,9,10], and subluminal and superluminal light propagation [11, 12]
We propose a scheme for controlling coherence transfer among ground state and indirect exciton states of triple quantum dots (TQDs) via the technique of stimulated Raman adiabatic passage (STIRAP)
The TQD structure can be treated as a four-level tripod system (Fig. 1b): the ground state |0〉, where there is no excitations in any quantum dots (QDs), the direct exciton state |1〉, where the electron and hole are both in the first QD, the indirect exciton state |2〉, where the electron is in the second dot and the hole remains in the first dot, and the indirect exciton state |3〉, where the electron is in the third dot and the hole remains in the first dot
Summary
Atomic coherence has attracted considerable interest in recent years because atomic coherence is essential for many effects, such as electromagnetically induced transparency (EIT) [1,2,3], laser without inversion [4,5,6], coherent population transfer [7,8,9,10], and subluminal and superluminal light propagation [11, 12]. The technique of stimulated Raman adiabatic passage (STIRAP) can be used for coherent controlling of an atomic system to a particular state, both in a Λ-type three-level system [13, 14] and in a multiple-level system [15,16,17,18,19]. By fractional STIRAP (F-STIRAP), creation of atomic coherence can be obtained [20]. In a Λ-type system where the final state has twofold states, creation of atomic coherence by STIRAP is possible because of the double dark states induced by the control laser [21]. QDs have larger electric-dipole moments and higher nonlinear optical
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