In the present work a possibility of computation modeling, which should be realized in a real quantum computer, is discussed. In this connection two models of a device, which work is determined by the structure and dynamics of real molecular systems are reported.
The work is devoted to investigation from the standpoint of quantum physics the possibility of using the scattering of a beam of light on crystals for calculations. There is proposed a model of computation, corresponding the transformation of the light beam as it passes through the crystal, and provided the necessary formulas for the calculation of the model. It is necessary to emphasize the abstract nature of the research, which is aimed at creation of the theoretical basis for further study of the produced algebraic structures, rather than the construction of a real device – a quantum computer or the like. The work carried out by the program of creation of algebraic computer.
In terms of leveraging the total power of quantum computing, the prevalent current (2020) model of designing quantum computation devices to follow the von Neuman model of abstraction is highly unlikely to be making full use of the full range of computational assistance possible at the atomic and molecular level. This is particularly the case for molecular modeling, in using computational models that more directly leverage the quantum effects of one set of molecules to estimate the behavior of some other set of molecules would remove the bottleneck of insisting that modeling first be converted to the virtual binary or digital format of quantum von Neuman machines. It is argued that even though this possibility of “fighting molecular quantum dynamics with molecular quantum dynamics” was recognized by early quantum computing founders such as Yuri Manin and Richard Feynman, the idea was quickly overlooked in favor of the more computer-compatible model that later developed into qubits and qubit processing.
Bosonic quantum devices offer a novel approach to realize quantum computations, where the quantum two-level system ( qubit ) is replaced with the quantum (an)harmonic oscillator ( qumode ) as the fundamental building block of the quantum simulator. The simulation of chemical structure and dynamics can then be achieved by representing or mapping the system Hamiltonians in terms of bosonic operators. In this Perspective, we review recent progress and future potential of using bosonic quantum devices for addressing a wide range of challenging chemical problems, including the calculation of molecular vibronic spectra, the simulation of gas-phase and solution-phase adiabatic and nonadiabatic chemical dynamics, the efficient solution of molecular graph theory problems, and the calculations of electronic structure.
In this paper we demonstrate, through numerical calculations, the possibility of determining the field dependence of the ac Stark effect through the interaction of an atom (or molecule) with a bichromatic ultrafast laser field. The time-dependent Schrödinger equation is solved for a single active electron confined to move in a square-well potential distorted by an intense Stark field in combination with a perturbative probe field which connects a pair of levels through photon absorption. The aim is to determine the field parameters that allow the dependence of the dynamic shift of the optically connected levels on the Stark field to be mapped out in real time. The calculations show that this can be achieved when the duration of the probe field is at least as short as the half-cycle period of the Stark field. An experimental realization of the proposed measurement scheme and its limitations are discussed. It is also possible, in principle, to adopt the ac Stark effect to determine the absolute phase of the carrier wave of an ultrafast laser pulse.