903 citations · 2.9k across the 43 of their papers we have counts for
43 papers
Inferring charge-noise source locations from correlations in spin qubits
Juan S. Rojas-Arias, Akito Noiri, Jun Yoneda +7
We investigate low-frequency noise in a spin-qubit device made in isotopically purified Si/Si-Ge. Observing sizable cross-correlations among energy fluctuations of different qubits…
The origins of noise in the Zeeman splitting of spin qubits in natural-silicon devices
Juan S. Rojas-Arias, Yohei Kojima, Kenta Takeda +7
We measure and analyze noise-induced energy-fluctuations of spin qubits defined in quantum dots made of isotopically natural silicon. Combining Ramsey, time-correlation of single-s…
Spatial noise correlations beyond nearest-neighbor in Si/SiGe spin qubits
Juan S. Rojas-Arias, Akito Noiri, Peter Stano +8
We detect correlations in qubit-energy fluctuations of non-neighboring qubits defined in isotopically purified Si/SiGe quantum dots. At low frequencies (where the noise is stronges…
Visual explanations of machine learning model estimating charge states in quantum dots
Yui Muto, Takumi Nakaso, Motoya Shinozaki +13
Charge state recognition in quantum dot devices is important in the preparation of quantum bits for quantum information processing. Toward auto-tuning of larger-scale quantum devic…
Feedback-based active reset of a spin qubit in silicon
Takashi Kobayashi, Takashi Nakajima, Kenta Takeda +3
Feedback control of qubits is a highly demanded technique for advanced quantum information protocols such as quantum error correction. Here we demonstrate active reset of a silicon…
Noise-correlation spectrum for a pair of spin qubits in silicon
J. Yoneda, J. S. Rojas-Arias, P. Stano +5
Semiconductor qubits are appealing for building quantum processors as they may be densely integrated due to small footprint. However, a high density raises the issue of noise corre…
Control of dephasing in spin qubits during coherent transport in silicon
MengKe Feng, Jun Yoneda, Wister Huang +12
One of the key pathways towards scalability of spin-based quantum computing systems lies in achieving long-range interactions between electrons and increasing their inter-connectiv…
Bayesian estimation of correlation functions
Angel Gutierrez-Rubio, Juan S. Rojas-Arias, Jun Yoneda +3
We apply Bayesian statistics to the estimation of correlation functions. We give the probability distributions of auto- and cross-correlations as functions of the data. Our procedu…
Fast Bayesian tomography of a two-qubit gate set in silicon
T. J. Evans, W. Huang, J. Yoneda +9
Benchmarking and characterising quantum states and logic gates is essential in the development of devices for quantum computing. We introduce a Bayesian approach to self-consistent…
Designs for a two-dimensional Si quantum dot array with spin qubit addressability
Masahiro Tadokoro, Takashi Nakajima, Takashi Kobayashi +6
Electron spins in Si are an attractive platform for quantum computation, backed with their scalability and fast, high-fidelity quantum logic gates. Despite the importance of two-di…
Gate voltage dependence of noise distribution in radio-frequency reflectometry in gallium arsenide quantum dots
Motoya Shinozaki, Yui Muto, Takahito Kitada +10
We investigate gate voltage dependence of electrical readout noise in high-speed rf reflectometry using gallium arsenide quantum dots. The fast Fourier transform spectrum from the…
Roadmap for gallium arsenide spin qubits
Ferdinand Kuemmeth, Hendrik Bluhm
Gate-defined quantum dots in gallium arsenide (GaAs) have been used extensively for pioneering spin qubit devices due to the relative simplicity of fabrication and favourable elect…
Quantum tomography of an entangled three-spin state in silicon
Kenta Takeda, Akito Noiri, Takashi Nakajima +3
Quantum entanglement is a fundamental property of coherent quantum states and an essential resource for quantum computing. While two-qubit entanglement has been demonstrated for sp…
Coherent spin qubit transport in silicon
J. Yoneda, W. Huang, M. Feng +12
A fault-tolerant quantum processor may be configured using stationary qubits interacting only with their nearest neighbours, but at the cost of significant overheads in physical qu…
Pauli Blockade in Silicon Quantum Dots with Spin-Orbit Control
Amanda Seedhouse, Tuomo Tanttu, Ross C. C. Leon +12
Quantum computation relies on accurate measurements of qubits not only for reading the output of the calculation, but also to perform error correction. Most proposed scalable silic…
Spin orbit field in a physically defined p type MOS silicon double quantum dot
Marian Marx, Jun Yoneda, Ángel Gutiérrez Rubio +10
We experimentally and theoretically investigate the spin orbit (SO) field in a physically defined, p type metal oxide semiconductor double quantum dot in silicon. We measure the ma…
Coherence of a driven electron spin qubit actively decoupled from quasi-static noise
Takashi Nakajima, Akito Noiri, Kento Kawasaki +11
The coherence of electron spin qubits in semiconductor quantum dots suffers mostly from low-frequency noise. During the last decade, efforts have been devoted to mitigate such nois…
Repetitive single electron spin readout in silicon
J. Yoneda, K. Takeda, A. Noiri +5
Single electron spins confined in silicon quantum dots hold great promise as a quantum computing architecture with demonstrations of long coherence times, high-fidelity quantum log…
Resonantly driven singlet-triplet spin qubit in silicon
Kenta Takeda, Akito Noiri, Jun Yoneda +2
We report implementation of a resonantly driven singlet-triplet spin qubit in silicon. The qubit is defined by the two-electron anti-parallel spin states and universal quantum cont…
Radio-frequency detected fast charge sensing in undoped silicon quantum dots
Akito Noiri, Kenta Takeda, Jun Yoneda +3
Spin qubits in silicon quantum dots offer a promising platform for a quantum computer as they have a long coherence time and scalability. The charge sensing technique plays an esse…
Quantum nondemolition measurement of an electron spin qubit
Takashi Nakajima, Akito Noiri, Jun Yoneda +11
Measurement of quantum systems inevitably involves disturbance in various forms. Within the limits imposed by quantum mechanics, however, one can design an "ideal" projective measu…
A silicon quantum-dot-coupled nuclear spin qubit
Bas Hensen, Wister Wei Huang, Chih-Hwan Yang +9
Single nuclear spins in the solid state have long been envisaged as a platform for quantum computing, due to their long coherence times and excellent controllability. Measurements…
Difference in charge and spin dynamics in a quantum dot-lead coupled system
Tomohiro Otsuka, Takashi Nakajima, Matthieu R. Delbecq +12
We analyze time evolution of charge and spin states in a quantum dot coupled to an electric reservoir. Utilizing high-speed single-electron detection, we focus on dynamics induced…
Four single-spin Rabi oscillations in a quadruple quantum dot
Takumi Ito, Tomohiro Otsuka, Takashi Nakajima +9
Scaling up qubits is a necessary step to realize useful systems of quantum computation. Here we demonstrate coherent manipulations of four individual electron spins using a micro-m…