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Proceedings Paper

Titanium TES based photon number resolving detectors with 1 MHz counting rate and 65% quantum efficiency
Author(s): Daiji Fukuda; Go Fujii; Takayuki Numata; Akio Yoshizawa; Hidemi Tsuchida; Shuichiro Inoue; Tatsuya Zama
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Paper Abstract

A transition edge sensor (TES) is one of superconducting photon detectors, which has a photon number resolving ability in light pulses. The TES device is a kind of calorimeters operated at an extremely low temperature, and the 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 response speed is limited due to slow thermal recovery time. To overcome this, we fabricated new TES devices which are based on a titanium superconductor. The critical temperature of our titanium films is around 410 mK, which greatly improves the thermal recovery time. The observed decay time constant of response signals to the light pulses is around several hundreds of ns, that make it possible to operate the devices at a counting rate over 1 MHz. The photon number resolving power is 0.35 eV(FWHM) for a 5 μm size device even at the high operating temperature. The system quantum efficiency is 65 % by embedding the TES films in an optical structure with a high reflection dielectric mirror and an anti-reflection coatings fabricated by an ion beam assisted sputtering method. These features are very promising for high speed photon number resolving applications in the quantum information field.

Paper Details

Date Published: 26 January 2009
PDF: 10 pages
Proc. SPIE 7236, Quantum Communications Realized II, 72360C (26 January 2009); doi: 10.1117/12.808851
Show Author Affiliations
Daiji Fukuda, National Institute of Advanced Industrial Science and Technology (Japan)
Go Fujii, National Institute of Advanced Industrial Science and Technology (Japan)
Nihon Univ. (Japan)
Takayuki Numata, National Institute of Advanced Industrial Science and Technology (Japan)
Akio Yoshizawa, National Institute of Advanced Industrial Science and Technology (Japan)
Hidemi Tsuchida, National Institute of Advanced Industrial Science and Technology (Japan)
Shuichiro Inoue, Nihon Univ. (Japan)
Tatsuya Zama, National Institute of Advanced Industrial Science and Technology (Japan)


Published in SPIE Proceedings Vol. 7236:
Quantum Communications Realized II
Yasuhiko Arakawa; Masahide Sasaki; Hideyuki Sotobayashi, Editor(s)

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