Universal nuclear focusing of confined electron spins
arXiv:1808.06571 · doi:10.1038/s41467-019-08882-y
Abstract
For spin-based quantum computation in semiconductors, dephasing of electron spins by a fluctuating background of nuclear spins is a main obstacle. Here we show that this nuclear background can be precisely controlled in generic quantum dots by periodically exciting electron spins. We demonstrate this universal phenomenon in many-electron GaAs/AlGaAs quantum dot ensembles using optical pump-probe spectroscopy. A feedback mechanism between the saturable electron spin polarization and the nuclear system focuses the electron spin precession frequency into discrete spin modes. Employing such control of nuclear spin polarization, the electron spin lifetime within individual dots can surpass the limit of nuclear background fluctuations, thus substantially enhancing the spin coherence time. This opens the door to achieve long electron spin coherence times also in lithographically-defined many-electron systems that can be controlled in shape, size and position.
References in corpus (25)
- Quantum Computation with Quantum Dots
- Spins in few-electron quantum dots
- A single-atom electron spin qubit in silicon
- Electrical control of a long-lived spin qubit in a Si/SiGe quantum dot
- Charge noise and spin noise in a semiconductor quantum device
- Strong spin-photon coupling in silicon
- Nuclear spin physics in quantum dots: an optical investigation
- Strong Coupling of a Single Electron in Silicon to a Microwave Photon
- Enhancing the Coherence of a Spin Qubit by Operating it as a Feedback Loop That Controls its Nuclear Spin Bath
- Coherent spin-qubit photon coupling
- Ultrafast optical rotations of electron spins in quantum dots
- Optical control of spin coherence in singly charged (In,Ga)As/GaAs quantum dots
- Confluence of resonant laser excitation and bi-directional quantum dot nuclear spin polarization
- Optical Read-Out and Initialization of an Electron Spin in a Single Quantum Dot
- Waveguide diffusion modes and slowdown of D'yakonov-Perel' spin relaxation in narrow 2-D semiconductor channels
- Dimensional Control of Antilocalisation and Spin Relaxation in Quantum Wires
- Pump-Probe Faraday Rotation and Ellipticity in an Ensemble of Singly Charged Quantum Dots
- Coherent spin dynamics of electrons and holes in semiconductor quantum wells and quantum dots under periodical optical excitation: resonant spin amplification versus spin mode-locking
- Control of the direction and rate of nuclear spin flips in InAs quantum dots using detuned optical pulse trains
- Suppressed decay of a laterally confined persistent spin helix
- Electron spin synchronization induced by optical nuclear magnetic resonance feedback
- Persistent narrowing of nuclear-spin fluctuations in InAs quantum dots using laser excitation
- Transition of a 2D spin mode to a helical state by lateral confinement
- Multitudes of Stable States in a Periodically Driven Electron-Nuclear Spin System in a Quantum Dot
- Interferometric detection of spin-polarized transport in the depletion layer of a metal-GaAs Schottky barrier
Cited by in corpus (7)
- Quantum Routing for Emerging Quantum Networks
- Suppression of nuclear spin fluctuations in an InGaAs quantum dot ensemble by GHz-pulsed optical excitation
- Interplay of spin mode locking and nuclei-induced frequency focusing in quantum dots
- Dynamic Nuclear Polarization by optical Stark effect in periodically-pumped gallium arsenide
- Nuclear magnetic resonance spectroscopy of nonequilibrium steady states in quantum dots
- Shielding of external magnetic field by dynamic nuclear polarization in (In,Ga)As quantum dots
- Dynamical nuclear spin polarization in a quantum dot with an electron spin driven by electric dipole spin resonance