58 citations · 176 across the 14 of their papers we have counts for
15 papers
In-Memory AM Demodulation Using an All-Silicon Independent-Dual-Gate Gain-Cell Memory with A Leakage Determined by Single-Electron Counting
Katsuhiko Nishiguchi, Toshiaki Hayashi, Kensaku Chida +3
Ultra-low-leakage memories are attracting increasing attention for in-memory sensing and computing. However, achieving sufficiently long retention in silicon memories for analog si…
Charge discreteness and the energy efficiency of information erasure in dynamic random-access memory cells
Takase Shimizu, Kouki Yamamoto, Kensaku Chida +2
A dynamic random-access memory (DRAM) cell stores information as an integer number of electrons on a capacitor, and whether this discreteness is thermodynamically relevant depends…
Strong intervalley mixing between copropagating quantum Hall edge channels in a silicon MOSFET
Gento Yamahata, Takase Shimizu
Copropagating quantum Hall edge channels provide a promising platform for compact electron interferometry and flying quantum states. In silicon, the valley degree of freedom offers…
Thermodynamic Constraints in Dynamic Random-Access Memory Cells: Experimental Verification of Energy Efficiency Limits in Information Erasure
Takase Shimizu, Kensaku Chida, Gento Yamahata +1
We measured the energy efficiency of information erasure using silicon DRAM cells capable of counting charges on capacitors at the single-electron level. Our measurements revealed…
Scalable Parallel Single-Electron Pumps in Silicon with Split-Source Control in the Nanoampere Regime
Gento Yamahata, Takase Shimizu, Katsuhiko Nishiguchi +1
Parallelizing single-electron pumps offers a promising route to achieving nanoampere-level currents crucial for quantum current standard applications. Achieving such current levels…
High frequency breakdown in quantum dots
Nathan Johnson, Gento Yamahata, Akira Fujiwara
Dynamic quantum dots are known to generate very accurate currents and can be used as a source of single electron wavepackets for use in quantum metrology, sensing or information pr…
An ambipolar single-charge pump in silicon
Gento Yamahata, Akira Fujiwara
The mechanism of single-charge pumping using a dynamic quantum dot needs to be precisely understood for high-accuracy and universal operation toward applications to quantum current…
Advances toward high-accuracy gigahertz operation of tunable-barrier single-hole pumps in silicon
Gento Yamahata, Akira Fujiwara
Precise and reproducible current generation is key to realize quantum current standards in metrology. A promising candidate is a tunable-barrier single-charge pump, which can accur…
Coulomb collisions of hot and cold single electrons in series-coupled silicon single-electron pumps
Gento Yamahata, Nathan Johnson, Akira Fujiwara
Control of the Coulomb interaction between single electrons is vital for realizing quantum information processing using flying electrons and, particularly, for the realization of d…
Precision measurement of an electron pump at 2 GHz
Stephen Giblin, Gento Yamahata, Akira Fujiwara +1
A well-characterised sample of silicon tunable-barrier electron pump has been operated at a frequency of 2 GHz using a custom drive waveform, generating a pump current of 320 pA. P…
Realisation of a quantum current standard at liquid helium temperature with sub-ppm reproducibility
Stephen Giblin, Emma Mykkänen, Antti Kemppinen +7
A silicon electron pump operating at the temperature of liquid helium has demonstrated repeatable operation with sub-ppm accuracy. The pump current, approximately 168 pA, is measur…
Derivation of potential profile of a dynamic quantum dot
Nathan Johnson, Gento Yamahata, Akira Fujiwara
We report a method to derive the potential barrier profile shape in a dynamic quantum dot and show the loading statistics, and hence accuracy of electron transfer, depend significa…
Picosecond coherent electron motion in a silicon single-electron source
Gento Yamahata, Sungguen Ryu, Nathan Johnson +3
Understanding ultrafast coherent electron dynamics is necessary for application of a single-electron source to metrological standards, quantum information processing, including ele…
Evidence for universality of tunable-barrier electron pumps
Stephen P. Giblin, Akira Fujiwara, Gento Yamahata +5
We review recent precision measurements on semiconductor tunable-barrier electron pumps operating in a ratchet mode. Seven studies on five different designs of pumps have reported…
Magnetic field dependence of Pauli spin blockade: a window into the sources of spin relaxation in silicon quantum dots
G. Yamahata, T. Kodera, H. O. H. Churchill +3
We investigate spin relaxation in a silicon double quantum dot via leakage current through Pauli blockade as a function of interdot detuning and magnetic field. A dip in leakage cu…