Stimulated Raman adiabatic passage in a two-state system (4 pages)

Nikolay V. Vitanov, Peter A. Ivanov

Nikolay V. Vitanov, Peter A. Ivanov

A. Karpati, Bruce W. Shore, Nikolay V. Vitanov +1 more

Nikolay V. Vitanov, Bruce W. Shore

We present a method, using adiabatic passage, for creating a maximally coherent superposition in a two-state atom. The method exploits the analogy between the two-state Bloch equations and the three-state stimulated Raman adiabatic passage (STIRAP) equations, and uses two sequential but overlapping pulsed fields, a driving pump pulse and a delayed but overlapped detuning pulse. Like STIRAP, this method is robustly insensitive to small changes in pulse properties.

Jabir Chathanathil, Aneesh Ramaswamy, Vladimir S. Malinovsky +2 more

In this work we develop a theory of fractional stimulated Raman adiabatic passage (FSTIRAP) using frequency-chirped pulses (CFSTIRAP). We analyze the CFSTIRAP as a method to create a coherent superposition state maximizing coherence between the initial and the target state in the presence of the two-photon detuning. We demonstrate that the pulse chirping permits relaxation of the condition of the two-photon resonance required for adiabatic passage in STIRAP and FSTIRAP. The choice of the chirp rate $|\ensuremath{\alpha}|=|\ensuremath{\delta}|/({t}_{p}\ensuremath{-}{t}_{s})$ enables adiabatic passage to a predetermined state between two nearly degenerate final states within a broad range of values of the two-photon detuning and the chirp rate. The proposed schemes will expand the scope of quantum control methods and contribute to the further improvement of quantum imaging, sensing, and metrology.

Jens Siewert, G. Falci, G. MANGANO +2 more