We present a general formalism for describing stimulated Raman adiabatic passage in a multilevel atom. The atom is assumed to have two ground state manifolds a and b and an excited state manifold e, and the adiabatic passage is carried out by resonantly driving the a-e and b-e transitions with time-dependent fields. Our formalism gives a complete description of the adiabatic passage process and...

We present a geometrical representation of the process of sum frequency generation in the undepleted pump approximation, in analogy with the known optical Bloch equations. We use this analogy to propose a technique for achieving both high efficiency and large bandwidth in sum frequency conversion using the adiabatic inversion scheme. The process is analogous with rapid adiabatic passage in NMR,...

Expressions for a K-adiabatic master equation for a bimolecular recombination rate constant krec are derived for a bimolecular reaction forming a complex with a single well or complexes with multiple well, where K is the component of the total angular momentum along the axis of least moment of inertia of the recombination product. The K-active master equation is also considered. The exact analy...

We have studied survival and rotational excitation probabilities of H(2)(v(i) = 1, J(i) = 1) and D(2)(v(i) = 1, J(i) = 2) upon scattering from Cu(111) using six-dimensional (6D) adiabatic (quantum and quasi-classical) and non-adiabatic (quasi-classical) dynamics. Non-adiabatic dynamics, based on a friction model, has been used to analyze the role of electron-hole pair excitations. Comparison be...

Chemical reactions that occur in the ground electronic state are described well by invoking the Born-Oppenheimer approximation, which allows their development to be rationalized by nuclear rearrangements that smoothly traverse an adiabatic potential energy surface. The situation is different, however, for reactions in electronically excited states, where non-adiabatic transitions occur between ...

Adiabatic logic style is Proving to be an attractive solution for low power digital design. The paper investigates low – power characteristics of complementary pass -transistor logic (CPL) circuits using AC power supply. The two-phase power-clock scheme is more suitable for the design of flip-flops and sequential circuits because it uses fewer transistors. The Adiabatic flip-flop have large ene...

This paper presents a novel modified comparator based on the combination of 2N-2N2P adiabatic logic and two phase adiabatic static clocked logic (2N-2N2P and 2PASCL), combination of efficient charge recovery adiabatic logic and two phase adiabatic static clocked logic (ECRL and 2PASCL). This new structure computes a decision making signal faster than the existing methods. The introduced logic b...

To account for the phenomenon of quantum decoherence of a macroscopic object, such as the localization and disappearance of interference, we invoke the adiabatic quantum entanglement between its collective states(such as that of the center-of-mass (C.M)) and its inner states based on our recent investigation. Under the adiabatic limit that motion of C.M dose not excite the transition of inner s...

This paper presents a new adiabatic circuit technique called Positive Feedback Adiabatic Logic (PFAL). Power reduction is achieved by recovering the energy in the recovery phase of the supply clock. Energy dissipation comparison with other logic circuits is performed. The main objective of this paper is to provide new low power solutions for Very Large Scale Integration (VLSI) designers. The dy...