Microchannel plate (MCP) is an important potential readout device for cryogenic quantum computing, especially for the quantum computation based on floating electrons of liquid helium surface. The signal readout time is a primary property of quantum computing, which is grounded in and proportional to the bulk resistance of the MCP multiplier. Notwithstanding, the bulk resistance of the MCP multiplier became giant at cryogenic temperature for the property of huge negative temperature coefficient of resistance, almost 105 Gohm at 20K~30K, resulting in a readout time of 10-2-1s at cryogenic temperature. That was one of the major bottlenecks for the cryogenic quantum computing application of MCPs. In this paper, ruthenium oxide films were sol-gel deposited onto the lead-bismuth-silicate glass, one kind of the base material for MCPs, produced by the Research and Development Center of Microchannel Plate, China Building Materials Academy. Surface topographic properties of the film were investigated with a laser scanning confocal microscope (LSCM). The hybrid bulk-resistance of RuO2 film deposited glass was measured in a modified Vacuum Photoelectron Imaging Test Facility (VPIT). It indicated that the sol-gel deposited RuO2 film could decrease the bulk resistance of hydrogen-reduced lead-bismuth-silicate glass and effectively mitigate its giant thermal resistance. This research can give a significant reference for developing MCP detectors in cryogenic quantum computing applications.
The SiO2-B2O3-La2O3-BaO glass has emerged as an important material due to its high performance. The effect of BaO content on the properties of SiO2-B2O3-La2O3-BaO glass such as density, thermal expansion coefficient, refractive index, and transmissivity were systematically studied. The results indicate that BaO content had influence on the density, refractive index and thermal expansion coefficient of the SiO2-B2O3-La2O3-BaO glass, BaO content did not have obvious impact on the transmissivity of SiO2-B2O3-La2O3-BaO glass.
The R2O-SiO2-B2O3 glass has emerged as an important material due to its high performance. During the process of glass melting, copious amounts of bubbles can be produced. The bubbles are considered as serious defects of the R2O-SiO2-B2O3 glass and can induce negative effects on properties of glass, such as optical uniformity, mechanical property, etc. The influence of the fining agents on the properties of R2O-SiO2-B2O3 glass such as density, refractive index, and transmissivity were systematically studied. The results indicate that fining agents had influence on the density of the R2O-SiO2-B2O3 glass, fining agents do not have obvious impact on the refractive index and transmissivity of R2O-SiO2-B2O3 glass.
The R2O-SiO2-B2O3 glass has emerged as an important material due to its high performance. Annealing condition has significant effect on the properties of R2O-SiO2-B2O3 glass. R2O-SiO2-B2O3 glass has been annealed in different temperature and holding time. The influence of the annealing condition on the properties of R2O-SiO2-B2O3 glass such as hardness, refractive index, and transmissivity were systematically studied. The results indicate that the annealing process can reduce glass hardness and improve refractive index significantly, but enhance transmissivity slightly. The optimal performance of the R2O-SiO2-B2O3 glass can be obtained under the annealing temperature of 650°C with the holding time of 4h.
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