Nature Search

Suppression of nuclear spin bath fluctuations in self-assembled quantum dots induced by inhomogeneous strain

Decoherence of the nuclear spin bath causes decoherence of electron spin qubits in the solid state. Here, Chekhovich et al.use spin-echo measurements to demonstrate the suppression of nuclear spin fluctuations in semiconductor quantum dots via strain-induced quadrupolar interactions.

E.A. Chekhovich
M. Hopkinson
A.I. Tartakovskii
ResearchOpen Access23 Feb 2015
Nature Communications

Volume: 6, P: 1-7
Approaching a fully-polarized state of nuclear spins in a solid

Highly polarized nuclear spins can supress decoherence of electron spin qubits, but this requires near-unity polarization. Here the authors implement a protocol combining optical excitation and fast carrier tunnelling to achieve nuclear spin polarizations above 95% in GaAs quantum dots on a timescale of 1 minute.

Peter Millington-Hotze
Harry E. Dyte
Evgeny A. Chekhovich
ResearchOpen Access02 Feb 2024
Nature Communications

Volume: 15, P: 1-7
Nuclear spin diffusion in the central spin system of a GaAs/AlGaAs quantum dot

Interaction between localized electron spins and nuclear spins causes shifts in nuclear spin energy levels, but how this affects nuclear spin diffusion in quantum dots is not fully understood. Here the authors show that the central electron accelerates nuclear spin diffusion in GaAs/AlGaAs quantum dots.

Peter Millington-Hotze
Santanu Manna
Evgeny A. Chekhovich
ResearchOpen Access09 May 2023
Nature Communications

Volume: 14, P: 1-10
Harnessing many-body spin environment for long coherence storage and high-fidelity single-shot qubit readout

Hybrid quantum devices based on coupled nuclear and electron spins offer promising applications, but require long nuclear spin coherence times. Here the authors demonstrate millisecond coherence times for a nuclear spin ensemble coupled to a single electron spin qubit in a semiconductor quantum dot.

George Gillard
Edmund Clarke
Evgeny A. Chekhovich
ResearchOpen Access13 Jul 2022
Nature Communications

Volume: 13, P: 1-8
Pulse control protocols for preserving coherence in dipolar-coupled nuclear spin baths

Fluctuating nuclear spin ensembles are a significant decoherence mechanism for solid-state spin qubits. Here the authors introduce an approach to controlling and extending the coherence of a nuclear spin bath around self-assembled quantum dots and gain insight into the many-body dynamics.

A. M. Waeber
G. Gillard
E. A. Chekhovich
ResearchOpen Access17 Jul 2019
Nature Communications

Volume: 10, P: 1-9
Nuclear spin quantum register in an optically active semiconductor quantum dot

Epitaxial quantum dot charge spin qubits offer efficient quantum light links, but their coherence is limited by interactions with the nanoscale ensemble of atomic nuclear spins. Employing nuclear spins instead as its hardware, strain-free GaAs/AlGaAs quantum dots can constitute a fully functional two-qubit quantum register.

Evgeny A. Chekhovich
Saimon F. Covre da Silva
Armando Rastelli
Research28 Sept 2020
Nature Nanotechnology

Volume: 15, P: 999-1004
Measurement of the spin temperature of optically cooled nuclei and GaAs hyperfine constants in GaAs/AlGaAs quantum dots

Measurement of the nuclear polarization in GaAs/AlGaAs quantum dots through manipulation of the nuclear spin states with radiofrequency pulses reveals polarizations up to 80%.

E. A. Chekhovich
A. Ulhaq
M. S. Skolnick
Research07 Aug 2017
Nature Materials

Volume: 16, P: 982-986
Element-sensitive measurement of the hole–nuclear spin interaction in quantum dots

Quantum dots are a promising host for spin-based qubits. Whereas nuclear-field fluctuations adversely affect electron-spin coherence, the smaller hyperfine interaction between holes and nuclei makes holes a promising alternative. A sensitive measurement of the hyperfine constant of the holes in different quantum-dot material systems now demonstrates how this interaction can be tuned and perhaps further reduced.

E. A. Chekhovich
M. M. Glazov
A. I. Tartakovskii
Research23 Dec 2012
Nature Physics

Volume: 9, P: 74-78
Structural analysis of strained quantum dots using nuclear magnetic resonance

Optically detected nuclear magnetic resonance spectroscopy can be used to measure the composition and strain distribution of individual quantum dots.

E. A. Chekhovich
K. V. Kavokin
A. I. Tartakovskii
Research26 Aug 2012
Nature Nanotechnology

Volume: 7, P: 646-650
Optical investigation of the natural electron doping in thin MoS₂ films deposited on dielectric substrates

D. Sercombe
S. Schwarz
A. I. Tartakovskii
ResearchOpen Access12 Dec 2013
Scientific Reports

Volume: 3, P: 1-6
Few-second-long correlation times in a quantum dot nuclear spin bath probed by frequency-comb nuclear magnetic resonance spectroscopy

Using a frequency-comb nuclear magnetic resonance spectroscopy technique it is possible to probe the fluctuations in the nuclear spin bath of a self-assembled quantum dot and reveal long nuclear spin correlation times over one second.

A. M. Waeber
M. Hopkinson
E. A. Chekhovich
Research14 Mar 2016
Nature Physics

Volume: 12, P: 688-693
III–V quantum light source and cavity-QED on Silicon

I. J. Luxmoore
R. Toro
A. I. Tartakovskii
ResearchOpen Access07 Feb 2013
Scientific Reports

Volume: 3, P: 1-5
Fundamental limits of electron and nuclear spin qubit lifetimes in an isolated self-assembled quantum dot

George Gillard
Ian M. Griffiths
Evgeny A. Chekhovich
ResearchOpen Access24 Feb 2021
npj Quantum Information

Volume: 7, P: 1-8
Nuclear spin effects in semiconductor quantum dots

Semiconducting quantum dots are considered candidate materials for realizing spin-based quantum computation devices. This Review examines the main results obtained over the past decade concerning the so-called central spin problem, namely the interaction between a single electronic spin or hole with the surrounding nuclear environment.

E. A. Chekhovich
M. N. Makhonin
L. M. K. Vandersypen
Reviews22 May 2013
Nature Materials

Volume: 12, P: 494-504

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