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Article
Observation of a Strongly Enhanced Relaxation Time of an In-situ Tunable Transmon on a Silicon Substrate up to the Purcell Limit Approaching 100 μs
The remarkable advances of quantum computation technology with superconducting qubits based on circuit quantum electrodynamics (QED) architecture have been achieved by improving control, protection and measure...
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Article
A Full-Tensor Superconducting Gravity Gradiometer System Composed of Levitation-Type Accelerometers
In this paper, a superconducting gravity gradiometer system that is designed to measure full-tensor gravity gradients based on levitation-type component accelerometers without using mechanical springs is prese...
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Article
Open AccessConstruction of controlled-NOT gate based on microwave-activated phase (MAP) gate in two transmon system
We experimentally constructed an all-microwave scheme for the controlled-NOT (cNOT) gate between two superconducting transmon qubits in a three dimensional cavity. Our cNOT gate is based on the microwave-activ...
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Article
Investigation of the Dependences of the Attenuation Properties of Cryogenic Metal-Powder Filters on the Preparation Method
We fabricated low-pass metal powder filters for use in low-noise measurements at cryogenic temperatures and investigated their attenuation characteristics for different wire-turn densities, metalpowder shapes,...
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Article
Fabrication of YBa2Cu3O7 twin-boundary-junction dc SQUID by using a focused-ion-beam pattern technique
We have fabricated YBa2Cu3O7 (YBCO) dc SQUIDs containing nanobridges across twin boundaries of LaAlO3 (LAO) substrates as Josephson elements by using a focused ion beam (FIB) etching method and measured their tra...
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Article
Detection of the superconducting transition and magnetic flux trap** in a niobium micro-ring by using micro-Hall sensors
An InAs heterostructure-based micro-Hall sensor was used to study the magnetic properties of a superconducting Nb micro-ring, enabling observation of magnetic phenomena such as diamagnetism onset and magnetic ...
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Article
Study on the fabrication of low-pass metal powder filters for use at cryogenic temperatures
We fabricated compact low-pass stainless-steel powder filters for use in low-noise measurements at cryogenic temperatures and investigated their attenuation characteristics for different wire lengths, filter s...
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Article
Effects of electron-beam irradiation on the transition properties of YBa2Cu3O7−d grain boundary junctions
We have studied the effects of high-energy electron-beam irradiation on the transition properties of superconducting YBa2Cu3O7−d (YBCO) grain boundary junctions, bicrystal junctio...
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Article
Superconducting transition properties of grain boundaries in MgB2 films
The intergrain interface of unconventional superconductors suppresses the order parameter and, thus, serves as a bottleneck for the supercurrent. Such a characteristic of the grain interface is a major limitin...
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Article
Critical properties of the high-energy electron-beam-irradiated superconductor weak links
We have studied the effects of high-energy electron-beam irradiation on the superconducting transition properties of an YBCO bicrystal junction, a focused ion-beam (FIB)-patterned YBCO nanobridge, a MgB2 intergra...
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Article
High-quality nanomechanical resonator based on a defect-free gold nanowire
Nanomechanical resonators were fabricated using defect-free single-crystalline Au nanowires (NWs), and their mechanical properties were investigated by using the magneto-motive detection method. The fabricated...
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Article
Fabrication and characterization of nanopatterned LaAlO3/SrTiO3 heterostructures
We report the fabrication of nanopatterned conduction channels and electrical transport of a two-dimensional electron gas formed at a LaAlO3/SrTiO3 heterointerface. The nanoscale channels are formed by electron b...
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Article
Comparison of the superconducting transition properties of YBa2Cu3O7 nanobridges with and without a twin boundary
We have fabricated nanobridges from YBa2Cu3O7 films deposited on LaAlO3 substrates by using a focused ion beam technique and studied their superconducting transition properties with and without a twin boundary (T...
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Article
Properties of FeSe nanobridges prepared by using a focused ion beam
We have fabricated FeSe nanobridges by using a focused ion beam (FIB) etching technique and studied their transport properties. FeSe films were prepatterned into microbridges by using a standard photolithograp...
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Article
Fabrication of BaKFeAs intergrain nanobridges by using a focused ion beam
We have studied the fabrication and the transport properties of Ba0.6K0.4Fe2As2 intergrain nanobridges patterned by using a focused ion beam (FIB). Prior to FIB etching, 8-µm-wide bridges were prepatterned from B...
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Article
Fabrication and characterization of an attonewton-sensitivity Si cantilever with an Nb micro-ring
We have fabricated ultrasensitive silicon cantilevers integrated with a superconducting Nb microring as a key part of a flux quantum-based force measurement system and have characterized both their mechanical ...
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Chapter
Acoustic Response of YBa2Cu3Ox Films
Since the discovery of high temperature oxide superconductors many different experiments have been conducted to find some clues to the understanding of the basic mechanism. Acoustic attenuation measurement was...
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Chapter
Disorder-Induced Pair Breaking in Superconductors
By enhancing thermal supercurrent fluctuations, disorder can cause significant pair-breaking effects on the transition temperature, density of states, and order parameter in superconductors. We have observed t...
