@article{oai:ynu.repo.nii.ac.jp:00009907,
 author = {Takeuchi, Naoki and Yamae, Taiki and Ayala, Christopher L. and Suzuki, Hideo and Yoshikawa, Nobuyuki},
 issue = {4},
 journal = {Applied physics letters},
 month = {Jan},
 note = {Adiabatic quantum-flux-parametron (AQFP) logic is an energy-efficient superconductor logic family. In this paper, we conducted the high-frequency operation and energy measurement of an AQFP circuit with more than 1000 Josephson junctions in the experiment. We designed an 8-bit carry look-ahead adder (CLA) using AQFP gates and fabricated it using an advanced fabrication technology, the AIST 10 kA/cm^2 Nb high-speed standard process. The correct operation of the 8-bit CLA was demonstrated at a 1-GHz clock frequency for a critical carry propagation test vector. The energy dissipation of the 8-bit CLA was measured by observing the power of excitation current. Our results showed that the energy dissipation per operation of the 8-bit CLA can be estimated to be approximately 1.5 aJ, or 24kBT per junction, where kB is the Boltzmann constant and T is the operating temperature., This article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing. This article appeared in (Naoki Takeuchi et al 2019 App. Phy. Let. 114 042602) and may be found at [https://doi.org/10.1063/1.5080753].},
 title = {An adiabatic superconductor 8-bit adder with 24kBT energy dissipation per junction},
 volume = {114},
 year = {2019}
}