Transparency under double detuning-induced stimulated Raman adiabatic passage in atoms with hyperfine structure

On the polarization rotation by means of electromagnetically induced transparency

“…The photon polarization provides the most natural approach for qubit encoding, while for manipulating the photon polarization the Zeeman degeneracy of atomic levels is essential. The effects of such degeneracy in EIT were considered in a number of papers [11][12][13][14][15][16][17][18][19][20][21][22][23][24][25]. The polarization rotation of a single-photon linearly polarized pulse may be used for implementation of single-qubit gates.…”

Robust switching of superposition-states via a coherent double stimulated Raman adiabatic passage

“…In the present work, after an optimal control for relevant parameters, we represent a robust and simple way to change the population of two components of an initial superposition state in a three-level Λ configuration by utilizing a novel double-STIRAP. Different from the previous schemes such as double detuning-induced STIRAP where time-dependent detuning pulses are used to preserve the coherence in hyperfine levels [26], or a double-pass approach where a second reversed pulse sequence is used for measuring the single-pass transition probability [27], we apply a single pulse sequence to implement the b-STIRAP and d-STIRAP at the same time, in order to efficiently switch an arbitrary superposition state in a way of STIRAP transition, and the sensitivity of the scheme to other parameters such as the spontaneous loss of intermediate state, the laser pulse amplitudes, is also illustrated. Finally, we show a practical and robust operation to a fast switching of population of the two components of the state with a time period of 4.5µs and a high-fidelity > 0.99, indicating its wider perspectives to the coherent manipulation of quantum systems.…”