Explanipedia

A Fabry-Pérot cavity coupled surface plasmon photodiode for electrical biomolecular sensing Open

Giles Allison, Amrita Kumar Sana, Yuta Ogawa, Hidemi Kato, Kosei Ueno , et al. · 2021

Surface plasmon resonance is a well-established technology for real-time highly sensitive label-free detection and measurement of binding kinetics between biological samples. A common drawback, however, of surface plasmon resonance detecti…

A Fabry-Pérot cavity coupled surface plasmon photodiode for electrical biomolecular sensing Open

Giles Allison, Amrita Kumar Sana, Yuta Ogawa, Hidemi Kato, Kosei Ueno , et al. · 2021

Surface plasmon resonance (SPR) is a well-established technology for real-time highly sensitive label-free detection and measurement of binding kinetics between biological samples. A common drawback, however, of SPR detection is the necess…

Angular momentum transfer from photon polarization to an electron spin in a gate-defined quantum dot Open

T. Fujita, Kazuhiro Morimoto, Haruki Kiyama, Giles Allison, Marcus Larsson , et al. · 2019

Gate-defined quantum dots (QDs) are such a highly-tunable quantum system in which single spins can be electrically coupled, manipulated, and measured. However, the spins in gate-defined QDs are lacking its interface to free-space photons. …

Photogeneration of a single electron from a single Zeeman-resolved light-hole exciton with preserved angular momentum Open

Kazuyuki Kuroyama, Marcus Larsson, C. Y. Chang, Jo Muramoto, K. Heya , et al. · 2019

Electron spins in GaAs quantum dots have been used to make qubits with\nhigh-fidelity gating and long coherence time, necessary ingredients in\nsolid-state quantum computing. The quantum dots can also host photon qubits\nwith energy applic…

Difference in charge and spin dynamics in a quantum dot–lead coupled system Open

Tomohiro Otsuka, Takashi Nakajima, Matthieu R. Delbecq, Peter Stano, S. Amaha , et al. · 2019

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 by the first-order tunneling. We find that there is a diffe…

A fast quantum interface between different spin qubit encodings Open

Akito Noiri, Takashi Nakajima, Jun Yoneda, Matthieu R. Delbecq, Peter Stano , et al. · 2018

Coherent transfer of electron spin correlations assisted by dephasing noise Open

Takashi Nakajima, Matthieu R. Delbecq, Tomohiro Otsuka, S. Amaha, Jun Yoneda , et al. · 2018

Four single-spin Rabi oscillations in a quadruple quantum dot Open

Takumi Ito, Tomohiro Otsuka, Takashi Nakajima, Matthieu R. Delbecq, S. Amaha , et al. · 2018

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-magnet method in a quadruple quantum dot - the largest numbe…

A fast quantum interface between spin qubits of different codes Open

Akito Noiri, Takashi Nakajima, Jun Yoneda, Matthieu R. Delbecq, Peter Stano , et al. · 2018

Single-spin qubits in semiconductor quantum dots proposed by Loss and DiVincenzo (LD qubits) hold promise for universal quantum computation with demonstrations of a high single-qubit gate fidelity above 99.9 % and two-qubit gates in conjun…

Amplified and tunable transverse and longitudinal spin-photon coupling in hybrid circuit-QED Open

Neill Lambert, Mauro Cirio, Matthieu R. Delbecq, Giles Allison, Marian Marx , et al. · 2018

We describe a method to tune, in-situ, between transverse and longitudinal light-matter coupling in a hybrid circuit-QED device composed of an electron spin degree of freedom coupled to a microwave transmission line cavity. Our approach re…

A quantum-dot spin qubit with coherence limited by charge noise and fidelity higher than 99.9% Open

Jun Yoneda, Kenta Takeda, Tomohiro Otsuka, Takashi Nakajima, Matthieu R. Delbecq , et al. · 2017

Interplay of hot electrons from localized and propagating plasmons Open

Chung Vu Hoang, Koki Hayashi, Yasuo Ito, Naoki Gorai, Giles Allison , et al. · 2017

Plasmon-induced hot-electron generation has recently received considerable interest and has been studied to develop novel applications in optoelectronics, photovoltaics and green chemistry. Such hot electrons are typically generated from e…

Robust Single-Shot Spin Measurement with 99.5% Fidelity in a Quantum Dot Array Open

Takashi Nakajima, Matthieu R. Delbecq, Tomohiro Otsuka, Peter Stano, S. Amaha , et al. · 2017

We demonstrate a new method for projective single-shot measurement of two electron spin states (singlet versus triplet) in an array of gate-defined lateral quantum dots in GaAs. The measurement has very high fidelity and is robust with res…

A triangular triple quantum dot with tunable tunnel couplings Open

Akito Noiri, Kento Kawasaki, Tomohiro Otsuka, Takashi Nakajima, Jun Yoneda , et al. · 2017

A two-dimensional arrangement of quantum dots with finite inter-dot tunnel\ncoupling provides a promising platform for studying complicated spin\ncorrelations as well as for constructing large-scale quantum computers. Here,\nwe fabricate a…

Robust single-shot measurement of spin correlations using a metastable charge state in a quantum dot array Open

Takashi Nakajima, Matthieu R. Delbecq, Tomohiro Otsuka, Peter Stano, S. Amaha , et al. · 2017

We report precise single-shot measurement of electron spin correlations using a metastable charge state in a triple quantum dot. Spin-blocked states are transferred to the metastable state by loading an extra electron from a reservoir, lea…

Detection and control of charge states in a quintuple quantum dot Open

Takumi Ito, Tomohiro Otsuka, S. Amaha, Matthieu R. Delbecq, Takashi Nakajima , et al. · 2016

Signatures of Hyperfine, Spin-Orbit, and Decoherence Effects in a Pauli Spin Blockade Open

T. Fujita, Peter Stano, Giles Allison, Kazuhiro Morimoto, Yosuke Sato , et al. · 2016

We detect in real time interdot tunneling events in a weakly coupled two-electron double quantum dot in GaAs. At finite magnetic fields, we observe two characteristic tunneling times T_{d} and T_{b}, belonging to, respectively, a direct an…

A fault-tolerant addressable spin qubit in a natural silicon quantum dot Open

Kenta Takeda, Jun Kamioka, Tomohiro Otsuka, Jun Yoneda, Takashi Nakajima , et al. · 2016

This is the first experimental demonstration of a fault-tolerant spin qubit in industry-compatible isotopically natural silicon.

Phase control of local and non-local entanglement in a triple spin qubit Open

Takashi Nakajima, Matthieu R. Delbecq, Tomohiro Otsuka, S. Amaha, Jun Yoneda , et al. · 2016

Entanglement is at the heart of quantum mechanics and an essential ingredient of spin correlations in superconductivity and the Kondo effect and quantum non-locality of noninteracting particles1–4. Non-local entanglement is also key to qua…

Quantum Dephasing in a Gated GaAs Triple Quantum Dot due to Nonergodic Noise Open

Matthieu R. Delbecq, Takashi Nakajima, Peter Stano, Tomohiro Otsuka, S. Amaha , et al. · 2016

We extract the phase coherence of a qubit defined by singlet and triplet electronic states in a gated GaAs triple quantum dot, measuring on time scales much shorter than the decorrelation time of the environmental noise. In this nonergodic…

Single photoelectron spin detection and angular momentum transfer in a gate defined quantum dot Open

T. Fujita, Kazuhiro Morimoto, Haruki Kiyama, Giles Allison, Marcus Larsson , et al. · 2015

Recent innovations in fabricating nanoscale confined spin systems have enabled investigation of fundamental quantum correlations between single quanta of photons and matter states. Realization of quantum state transfer from photon polariza…

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