425 citations · 671 across the 6 of their papers we have counts for
6 papers
Microwave characterization of tantalum superconducting resonators on silicon substrate with niobium buffer layer
Yoshiro Urade, Kay Yakushiji, Manabu Tsujimoto +4
Tantalum thin films sputtered on unheated silicon substrates are characterized with microwaves at around 10 GHz in a 10 mK environment. We show that the phase of tantalum with a bo…
Toward Practical-Scale Quantum Annealing Machine for Prime Factoring
Masaaki Maezawa, Go Fujii, Mutsuo Hidaka +8
We propose a prime factorizer operated in a framework of quantum annealing (QA). The idea is inverse operation of a multiplier implemented with QA-based Boolean logic circuits. We…
Polarization-resolved terahertz third-harmonic generation in a superconductor NbN: dominance of Higgs mode beyond the BCS approximation
Ryusuke Matsunaga, Naoto Tsuji, Kazumasa Makise +3
Recent advances in time-domain terahertz (THz) spectroscopy have unveiled that resonantly-enhanced strong THz third-harmonic generation (THG) mediated by the collective Higgs ampli…
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…
Crosstalk-free operation of multi-element SSPD array integrated with SFQ circuit in a 0.1 Watt GM cryocooler
Taro Yamashita, Shigehito Miki, Hirotaka Terai +2
We demonstrate the successful operation of a multi-element superconducting nanowire single-photon detector (SSPD) array integrated with a single-flux-quantum (SFQ) readout circuit…
Origin of intrinsic dark count in superconducting nanowire single-photon detectors
T. Yamashita, S. Miki, K. Makise +5
The origin of the decoherence in superconducting nanowire single-photon detectors, the so-called dark count, was investigated. We measured the direct-current characteristics and bi…