@article{oai:ynu.repo.nii.ac.jp:00008791,
 author = {Yamanashi, Yuki and Matsushima, Takashi and Takeuchi, Naoki and Yoshikawa, Nobuyuki and Ortlepp, Thomas},
 issue = {8},
 journal = {Superconductor Science and Technology},
 month = {Jul},
 note = {Current sensitivity of a quantum flux parametron (QFP) was evaluated by measuring gray zone width on the basis of both circuit simulation and measurements, for superconducting sensing systems composed of a superconducting sensor array and superconducting read-out and signal processing circuits. Simulation results indicate a narrow gray zone width can be obtained by decreasing inductances comprising the QFP. Moreover, both high-sensitivity and low-power operation of the QFP can be realized by using optimized circuit parameters with an excitation current that has long rise time. A gray zone width of approximately 0.5 μA, which is smaller than that of the Josephson current comparator based on a single flux quantum circuit, was obtained experimentally, using a trapezoidal excitation current with rise time of 50 μs. These results indicate the QFP is promising for the read-out circuit in superconducting sensing systems, due to its high sensitivity and low power consumption.},
 title = {Evaluation of current sensitivity of quantum flux parametron},
 volume = {30},
 year = {2017}
}