146 citations · 895 across the 19 of their papers we have counts for
14 papers · 1 filter
Dynamical suppression of fluctuations in an interacting nuclear spin bath of a self-assembled quantum dot using multiple pulse nuclear magnetic resonance
A. M. Waeber, M. Hopkinson, M. S. Skolnick +1
Electron spin qubit coherence in quantum dots is ultimately limited by random nuclear spin bath fluctuations. Here we aim to eliminate this randomness by making spin bath evolution…
Quadrupolar induced suppression of nuclear spin bath fluctuations in self-assembled quantum dots
E. A. Chekhovich, M. Hopkinson, M. S. Skolnick +1
Decoherence in quantum logic gates (qubits) due to interaction with the surrounding environment is a major obstacle to the practical realization of quantum information technologies…
Dynamic nuclear polarization in InGaAs/GaAs and GaAs/AlGaAs quantum dots under non-resonant ultra-low power optical excitation
J. Puebla, E. A. Chekhovich, M. Hopkinson +4
We study experimentally the dependence of dynamic nuclear spin polarization on the power of non-resonant optical excitation in two types of individual neutral semiconductor quantum…
High resolution nuclear magnetic resonance spectroscopy of highly-strained quantum dot nanostructures
E. A. Chekhovich, K. V. Kavokin, J. Puebla +7
Much new solid state technology for single-photon sources, detectors, photovoltaics and quantum computation relies on the fabrication of strained semiconductor nanostructures. Succ…
Isotope sensitive measurement of the hole-nuclear spin interaction in quantum dots
E. A. Chekhovich, A. B. Krysa, M. Hopkinson +4
Decoherence caused by nuclear field fluctuations is a fundamental obstacle to the realization of quantum information processing using single electron spins. Alternative proposals h…
Microcavity quantum-dot systems for non-equilibrium Bose-Einstein condensation
I. M. Piper, P. R. Eastham, M. Ediger +5
We review the practical conditions required to achieve a non-equilibrium BEC driven by quantum dynamics in a system comprising a microcavity field mode and a distribution of locali…
Quantum state preparation in semiconductor dots by adiabatic rapid passage
Yanwen Wu, I. M. Piper, M. Ediger +5
Preparation of a specific quantum state is a required step for a variety of proposed practical uses of quantum dynamics. We report an experimental demonstration of optical quantum…
Towards coherent optical control of a single hole spin: Rabi rotation of a trion conditional on the spin state of the hole
A. J. Ramsay, S. J. Boyle, T. M. Godden +8
A hole spin is a potential solid-state q-bit, that may be more robust against nuclear spin induced dephasing than an electron spin. Here we propose and demonstrate the sequential p…
Two qubit conditional quantum logic operation in a single self-assembled quantum dot
S. J. Boyle, A. J. Ramsay, F. Bello +4
The four-level exciton/biexciton system of a single semiconductor quantum dot acts as a two qubit register. We experimentally demonstrate an exciton-biexciton Rabi rotation conditi…
Intersublevel Polaron Dephasing in Self-Assembled Quantum Dots
E. A. Zibik, T. Grange, B. A. Carpenter +9
Polaron dephasing processes are investigated in InAs/GaAs dots using far-infrared transient four wave mixing (FWM) spectroscopy. We observe an oscillatory behaviour in the FWM sign…
Fast optical preparation, control and read-out of single quantum dot spin
A. J. Ramsay, S. J. Boyle, R. S. Kolodka +6
We propose and demonstrate the sequential initialization, optical control, and read-out of a single spin trapped in a semiconductor quantum dot. Hole spin preparation is achieved t…
Long nuclear spin decay times controlled by optical pumping in individual quantum dots
M. N. Makhonin, A. I. Tartakovskii, I. Drouzas +8
Nuclear polarization dynamics are measured in the nuclear spin bi-stability regime in a single optically pumped InGaAs/GaAs quantum dot. The controlling role of nuclear spin diffus…
Single-photon nonlinearity of a semiconductor quantum dot in a cavity
D. Sanvitto, F. P. Laussy, F. Bello +6
A single atom in a cavity is the model system of cavity quantum electrodynamics (CQED). The strong coupling regime between the atom and cavity-confined photon corresponds to the re…
Nuclear Spin Switch in Semiconductor Quantum Dots
A. I. Tartakovskii, T. Wright, A. Russell +10
We show that by illuminating an InGaAs/GaAs self-assembled quantum dot with circularly polarized light, the nuclei of atoms constituting the dot can be driven into a bistable regim…