Quantum control of exciton states in clusters of resonantly interacting fluorescent particles using biharmonic laser pumping

Theoretical method for states dynamics and entanglement optimization in bichromatically driven clusters of two and four resonantly interacting particles

“…(19), neglecting the term λ 2 Z 2 τ, which, in our case, changes the dynamics very slightly, as we show by plotting Eq. (19) with and without the term.…”

“…Besides, let us go back to the real time scale t. Naturally, the manipulations via bichromatic pumping with resonant frequencies demand radiation one or two orders less intensive than single-frequency two-photon processes, as was discussed in detail in [19].…”

“…While the theoretical apparatus for treatment of the monochromatic radiation problem is well elaborated, practical employment of bichromatic radiation looks more promising, because it demands lower laser intensities and considerably shortens manipulation times [19]. This means that during decoherence-limited time, many more quantum operations can be performed via bichromatic than via monochromatic pumping.…”

Nuclear forward scattering vs. conventional Mössbauer studies of atomically tailored Eu-based materials

“…Therefore, in the future, only a few selected optically active atoms or ions in a solid will form the 'core' of the quantum photonic devices. Some fascinating applications that could work with only a few atoms in a solid host are: (1) spectral storage, where the information is stored in the optical spectrum of a small number of selected atoms in a solid, (2) quantum computing with a few optically addressable atoms, and, (3) coherent control of nuclear states with a laser [4][5][6][7]. In all these and similar atomic scale applications, there are severe constraints imposed on the energy level structure of the host, the optically active ion, its nucleus, and even the nuclei of the host material.…”

Using biharmonic laser pumping for preparation of pure and entangled multiexciton states in clusters of resonantly interacting fluorescent centres

“…To give a fully developed and ready-to-be-used analysis, we illustrate the situation using experimental parameters characteristic for the rare-earth dopant ions, namely for the three-valent neodymium ions in a calcium fluoride crystal. This is motivated not only by our recent experiments demonstrating the preparation of entangled vacuum and single exciton, as well as vacuum and biexciton, states for the pairs of such ions (M-centres) [11], but also by the existence of the ''naturally designed'' tetramers composed by such ions (N-centres) [18,23]. These M-and N-centres were under intensive investigation during the last years [24][25][26][27][28], and are investigated nowadays aiming exactly the realization of the quantum states considered here.…”