The lattice atomic vibrations caused by ultrashort optical pulses, called optical coherent phonons, have been controlled in a variety of materials. However, empirical control has proved this control for different experiments and lacks a unified theory based on quantum mechanics. Scientists at the Tokyo Institute of Technology have successfully developed a unified theory for this phenomenon and have experimentally verified it in diamonds. Its optical phonons have great potential for application in quantum information technology. When a very short pulse of light enters a solid, the atoms in the lattice begin to vibrate. In general, this vibration of atoms exhibits wavy and particle-like behavior, and in quantum mechanics these vibrations are called coherent optical phonons because they are induced by light and oscillate in phase. Phonons can determine various physical properties of a solid, such as heat and conductivity. In previous experiments, the characteristics of coherent optical phonons, such as amplitude and phase, have been successfully controlled in various materials by techniques known as coherent control, which has been made possible by advances in ultrafast laser technology. However, different empirical theories have been used to explain the results of different coherent control experiments. Therefore, the research team led by Professor Kazutaka G. Nakamura of Tokyo Institute of Technology (Tokyo Institute of Technology) and Professor Yutaka Shikano of the Quantum Computing Center of Keio University and the Institute of Quantum of Chapman University have recently developed a theoretical framework that fundamentally The detection of this generation and coherent optical photons is explained above and in fact. The theory is based on models involving two electronic states and quantum harmonic oscillators, one of the few quantum mechanical systems known to have exact solutions. Calculations based on this theory show that the amplitude of a controlled phonon can be represented by the sum of two sinusoidal functions. To test this theory, scientists conducted coherent control experiments on diamonds. Diamonds are a very important material in this field because the coherent control of their optical phonons is expected to develop quantum memory. In the experiment, coherent control is achieved by using two extremely short laser pulses, called pump pulses: one pulse causes oscillation, or phonon, and the other is to control the amplitude of the oscillation. The time interval between the two pulses is changed to control the characteristics of the generated phonons. The probe pulse transmitted with delay after the two pump pulses is used to measure the characteristics of the generated phonon by detecting the change in the emission intensity of the pulse with respect to the delay. The measured amplitude and phase of the controlled oscillations caused by the pump pulses in the diamond show a significant agreement with the predictions of this theory. Therefore, a comprehensive understanding of the coherent control of coherent optical phonons has been achieved. In addition to electronics, optics, materials science, and other applications in superconductivity, the theory is expected to be used in the development of storage systems for quantum computing. Child Toilet Lock could be used in various of situations in your house, such as toilet seat, refrigerator, oven and so on. Reliable quality would bring a safe and happy life to your children. It could avoid your children take the medicines or any other dangerous things kept in the refrigerator or other situations. Matched with 3M adhesive tape making it easy to be installed with no harm to the furnitures and long time to use. Child Toilet Lock Child Toilet Lock,Customizable Child Toilet Lock,Universal Child Toilet Lock,Multi-Function Child Toilet Lock Ningbo Fabe Child Safety Co., Ltd. , https://www.fabesafe.com
Abstract The lattice atomic vibration caused by ultrashort optical pulses, called optical coherent phonons, has been controlled in various materials. However, empirical control has proved this control for different experiments and lacks a unified theory based on quantum mechanics. Scientists at Tokyo Institute of Technology succeeded in this...