425 citations · 3.2k across the 81 of their papers we have counts for
10 papers · 1 filter
Pulsed Sagnac polarization-entangled photon source with a PPKTP crystal at telecom wavelength
Rui-Bo Jin, Ryosuke Shimizu, Kentaro Wakui +6
We demonstrate pulsed polarization-entangled photons generated from a periodically poled (PPKTP) crystal in a Sagnac interferometer configuration at telecom wav…
Observation of two output light pulses from a partial wavelength converter preserving phase of an input light at a single-photon level
Rikizo Ikuta, Toshiki Kobayashi, Hiroshi Kato +9
We experimentally demonstrate that both a converted and an unconverted light pulses after wavelength conversion with various conversion efficiencies preserve phase information of a…
Efficient detection of a highly bright photon source using superconducting nanowire single photon detectors
Rui-Bo Jin, Mikio Fujiwara, Taro Yamashita +6
We investigate the detection of an ultra-bright single-photon source using highly efficient superconducting nanowire single-photon detectors (SNSPDs) at telecom wavelengths. Both t…
Countermeasure against tailored bright illumination attack for DPS-QKD
Toshimori Honjo, Mikio Fujiwara, Kaoru Shimizu +6
We propose a countermeasure against the so-call tailored bright illumination attacl dor Differential-Phase-Shift QKD (DPS-QKD). By Monitoring a rate of coincidence detection at a p…
Observation of three-state dressed states in circuit quantum electrodynamics
K. Koshino, H. Terai, K. Inomata +4
We have investigated the microwave response of a transmon qubit coupled directly to a transmission line. In a transmon qubit, owing to its weak anharmonicity, a single driving fiel…
Low-Filling-Factor Superconducting Single Photon Detector with High System Detection Efficiency
Taro Yamashita, Shigehito Miki, Hirotaka Terai +1
We designed, fabricated, and measured superconducting nanowire single-photon detectors (SSPDs) with low filling factor which achieve high system detection efficiency (SDE) and coun…
Higgs Amplitude Mode in BCS Superconductors NbTiN induced by Terahertz Pulse Excitation
Ryusuke Matsunaga, Yuki I. Hamada, Kazumasa Makise +4
Ultrafast responses of BCS superconductor Nb1-xTixN films in a nonadiabatic excitation regime were investigated by using terahertz (THz) pump-THz probe spectroscopy. After an insta…
High performance fiber-coupled NbTiN superconducting nanowire single photon detectors with Gifford-McMahon cryocooler
Shigehito Miki, Taro Yamashita, Hirotaka Terai +1
We present high performance fiber-coupled niobium titanium nitride superconducting nanowire single photon detectors fabricated on thermally oxidized silicon substrates. The best de…
Non-classical two-photon interference between independent telecom light pulses converted by difference-frequency generation
Rikizo Ikuta, Toshiki Kobayashi, Hiroshi Kato +9
We experimentally demonstrated the Hong-Ou-Mandel (HOM) interference between two photons after visible-to-telecommunication wavelength conversion. In the experiment, we prepared a…
Nonclasscial interference between independent intrinsically pure single photons at telecom wavelength
Ruibo Jin, Kentaro Wakui, Ryosuke Shimizu +7
We demonstrate a Hong-Ou-Mandel interference between two independent, intrinsically pure, heralded single photons from spontaneous parametric down conversion (SPDC) at telecom wave…