Details
| Original language | English |
|---|---|
| Article number | 075301 |
| Number of pages | 12 |
| Journal | Physical Review B |
| Volume | 104 |
| Issue number | 7 |
| Early online date | 5 Aug 2021 |
| Publication status | Published - 15 Aug 2021 |
Abstract
We present a comprehensive study on heralded spin preparation employing excited state resonances of droplet-etched GaAs quantum dots. This achievement will facilitate future investigations of spin qubit based quantum memories using the GaAs quantum dot material platform. By observation of excitation spectra for a range of fundamental excitonic transitions, the properties of different quantum dot energy levels, i.e., shells, are revealed. The innovative use of polarization-resolved excitation and detection in the context of quasiresonant excitation spectroscopy of quantum dots greatly simplifies the determination of the spin preparation fidelities - irrespective of the relative orientations of laboratory and quantum dot polarization eigenbases. By employing this method, spin preparation fidelities of quantum dot ground states of up to 85% are found. Additionally, the characteristic nonradiative decay time is investigated as a function of ground state, excitation resonance, and excitation power level, yielding decay times as low as 29 ps for s-p shell exited state transitions. Finally, by time-resolved correlation spectroscopy it is demonstrated that the employed excitation scheme has a significant impact on the electronic environment of quantum dot transitions and their apparent brightness.
ASJC Scopus subject areas
- Materials Science(all)
- Electronic, Optical and Magnetic Materials
- Physics and Astronomy(all)
- Condensed Matter Physics
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In: Physical Review B, Vol. 104, No. 7, 075301, 15.08.2021.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Heralded preparation of spin qubits in droplet-etched GaAs quantum dots using quasiresonant excitation
AU - Hopfmann, Caspar
AU - Sharma, Nand Lal
AU - Nie, Weijie
AU - Keil, Robert
AU - Ding, Fei
AU - Schmidt, Oliver G.
N1 - Funding Information: We thank Michael Zopf and Jingzhong Yang (LU Hannover) for fruitful discussions. We acknowledge funding by the BMBF project Q.link.X under Grant Agreement No. 100362122 and the European Research Council Horizon 2020 project QD-NOMS under Grant Agreement No. 715770.
PY - 2021/8/15
Y1 - 2021/8/15
N2 - We present a comprehensive study on heralded spin preparation employing excited state resonances of droplet-etched GaAs quantum dots. This achievement will facilitate future investigations of spin qubit based quantum memories using the GaAs quantum dot material platform. By observation of excitation spectra for a range of fundamental excitonic transitions, the properties of different quantum dot energy levels, i.e., shells, are revealed. The innovative use of polarization-resolved excitation and detection in the context of quasiresonant excitation spectroscopy of quantum dots greatly simplifies the determination of the spin preparation fidelities - irrespective of the relative orientations of laboratory and quantum dot polarization eigenbases. By employing this method, spin preparation fidelities of quantum dot ground states of up to 85% are found. Additionally, the characteristic nonradiative decay time is investigated as a function of ground state, excitation resonance, and excitation power level, yielding decay times as low as 29 ps for s-p shell exited state transitions. Finally, by time-resolved correlation spectroscopy it is demonstrated that the employed excitation scheme has a significant impact on the electronic environment of quantum dot transitions and their apparent brightness.
AB - We present a comprehensive study on heralded spin preparation employing excited state resonances of droplet-etched GaAs quantum dots. This achievement will facilitate future investigations of spin qubit based quantum memories using the GaAs quantum dot material platform. By observation of excitation spectra for a range of fundamental excitonic transitions, the properties of different quantum dot energy levels, i.e., shells, are revealed. The innovative use of polarization-resolved excitation and detection in the context of quasiresonant excitation spectroscopy of quantum dots greatly simplifies the determination of the spin preparation fidelities - irrespective of the relative orientations of laboratory and quantum dot polarization eigenbases. By employing this method, spin preparation fidelities of quantum dot ground states of up to 85% are found. Additionally, the characteristic nonradiative decay time is investigated as a function of ground state, excitation resonance, and excitation power level, yielding decay times as low as 29 ps for s-p shell exited state transitions. Finally, by time-resolved correlation spectroscopy it is demonstrated that the employed excitation scheme has a significant impact on the electronic environment of quantum dot transitions and their apparent brightness.
UR - http://www.scopus.com/inward/record.url?scp=85112032182&partnerID=8YFLogxK
U2 - 10.1103/physrevb.104.075301
DO - 10.1103/physrevb.104.075301
M3 - Article
VL - 104
JO - Physical Review B
JF - Physical Review B
SN - 2469-9950
IS - 7
M1 - 075301
ER -