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- W2026796657 abstract "A transition edge sensor (TES) is one of superconducting photon detectors, which has a photon number resolvingability in light pulses. The TES device is a kind of calorimeters operated at an extremely low temperature, andthe energy of the photons is measured as a resistance change in a superconducting transition region of the TES.The advantages of the TESs are an excellent energy resolution and a high quantum efficiency. However a responsespeed is limited due to slow thermal recovery time. To overcome this, we fabricated new TES devices which arebased on a titanium superconductor. The critical temperature of our titanium films is around 410 mK, whichgreatly improves the thermal recovery time. The observed decay time constant of response signals to the lightpulses is around several hundreds of ns, that make it possible to operate the devices at a counting rate over 1MHz. The photon number resolving power is 0.35 eV(FWHM) for a 5 μm size device even at the high operatingtemperature. The system quantum efficiency is 65 % by embedding the TES films in an optical structure witha high reflection dielectric mirror and an anti-reflection coatings fabricated by an ion beam assisted sputteringmethod. These features are very promising for high speed photon number resolving applications in the quantuminformation field." @default.
- W2026796657 created "2016-06-24" @default.
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- W2026796657 date "2009-01-24" @default.
- W2026796657 modified "2023-10-16" @default.
- W2026796657 title "Titanium TES based photon number resolving detectors with 1 MHz counting rate and 65% quantum efficiency" @default.
- W2026796657 doi "https://doi.org/10.1117/12.808851" @default.
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