Demonstration of Simultaneous Optical Transition-Edge Sensors Readout Using Microwave SQUID Multiplexer with 5 MHz Flux Ramp Modulation
摘要
Optical transition-edge sensor (TES) is a single-photon detector for the visible to near-infrared wavelength range. Recently, it has been applied to various applications such as quantum information, quantum computing, bio-imaging, and low-mass dark matter search. The challenge of implementing an optical TES in these applications lies in the need for a large number of channels. We have been developing a system that guarantees a large number of pixels by using an optical TES array and multiplexing readout method. Microwave SQUID multiplexing is a frequency multiplexing method that enables a wide readout frequency bandwidth by using a frequency of several GHz as a carrier wave. In this paper, we report the first demonstration of simultaneous readout of optical TESs by microwave SQUID multiplexing with a sampling frequency of 5 MHz.