Circuit Quantum Electrodynamics Used to Couple Photon with Qubit
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and L. Huang from the Shanghai Institute of Ceramics of the Chinese Academy of Sciences. Their technique ensures a uniform structure on the ceramic reticule. As reported in the July issue of the Journal of the American Ceramic Society (p. 1392), the researchers prepared a slurry from silicon nitride powders mixed with 7 wt% alumina added as a sintering additive, 23 wt% silica sol as a binder, 1.5 wt% carboxymethylcellulose as a thickening agent, and 0.2 wt% of Nopco 267-A as an antifoaming agent. The slurry was ball milled using silicon nitride balls. A polyurethane sponge was submerged in slurry and compressed there to achieve the most adsorption possible, then centrifuged at high speed. In this manner, the lattice was uniformly covered with a thin film. The preform thus obtained was dried and recoated in slurry, this time using vacuum to ensure coverage. This process was repeated using slurries of different viscosities. The measured weight gain of the sample after the first coating in slurry slightly increased with increasing slurry viscosity, and became constant for high-viscosity slurries. However, for the second coating, the measured weight gain was double that of the first coating for low-viscosity slurries, and increased dramatically with slurry viscosity. This is an effect of the enhanced adsorption created by the first thin film deposited on the lattice, said the researchers. Measurements of the diameters in the lattice struts were fairly uniform and almost identical to the joint diameters. The strut diameter increased with increasing slurry viscosity, as expected, since the weight gain was higher at higher viscosity in the second coating. Through this process, the researchers demonstrated the ability to obtain a highly uniform and robust reticule structure, even starting with any irregularly shaped sample. The combination of highspeed centrifuging after each coating and the use of high-viscosity slurry for the second coating improved mechanical properties of RPCs, the researchers reported. The only difficulty they noted was the need for completing the second coating before drying the sample to prevent it from absorbing water and crashing. SIARI SOSA
Circuit Quantum Electrodynamics Used to Couple Photon with Qubit One of the goals in quantum physics is to develop a quantum computer in which the transistors that form logic gates to manipulate bits in a classical computer are replaced with quantum logic gates that can store and process information quantum mechanically. The fundamental units of information manipulated in a quantum computer are called quantum bits or “qubits,” but implementations of the quantum logic gates are sometimes also referred to as qubits. R. Schoelkopf and the theory group of S. Girvin, both at Yale University, have conducted an experiment in which a single photon was coherently coupled to a single superconducting qubit or artificial atom consisting of about 10 billion aluminum atoms acting in concert like a single atom (see Figure 1). One way to connect qubits in a quantum computer
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