High fidelity optical preparation and coherent Larmor precession of a single hole in an InGaAs quantum dot molecule

Abstract

We employ ultrafast pump-probe spectroscopy with photocurrent readout to directly probe the dynamics of a single hole spin in a single, electrically tunable self-assembled quantum dot molecule formed by vertically stacking InGaAs quantum dots. Excitons with defined spin configurations are initialized in one of the two dots using circularly polarized picosecond pulses. The time-dependent spin configuration is probed by the spin selective optical absorption of the resulting few Fermion complex. Taking advantage of sub-5 ps electron tunneling to an orbitally excited state of the other dot, we initialize a single hole spin with a purity of >96%, i.e., much higher than demonstrated in previous single dot experiments. Measurements in a lateral magnetic field monitor the coherent Larmor precession of the single hole spin with no observable loss of spin coherence within the ~300 ps hole lifetime. Thereby, the purity of the hole spin initialization remains unchanged for all investigated magnetic fields.

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• Direct measurement of the hole-nuclear spin interaction in single quantum dots
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Cited by in corpus (19)

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• Quantum dot optomechanics in suspended nanophononic strings
• All optical quantum control of a spin-quantum state and ultrafast transduction into an electric current
• High-fidelity initialization of long-lived quantum dot hole spin qubits by reduced fine-structure splitting
• All electrically controlled quantum gates for single heavy hole spin qubits
• Controlled tunneling induced dephasing of Rabi rotations for ultra-high fidelity hole spin initialization
• Symmetry induced hole-spin mixing in quantum dot molecules
• Controllable electron spin dephasing due to phonon state distinguishability in a coupled quantum dot system
• Long-distance radiative excitation transfer between quantum dots in disordered photonic crystal waveguides
• Precessional angular velocity and field strength in the complex octonion space
• Hole Spin Pumping and Re-pumping in a p-type δ-doped InAs Quantum Dot
• Enhanced photocurrent readout for a quantum dot qubit by bias modulation
• The magneto-optics in quantum wires comprised of vertically stacked quantum dots: A calling for the magnetoplasmon qubits
• Passive stabilization of hole spin qubit using optical Stark effect
• Spin-orbit-induced hole spin relaxation in a quantum dot molecule: the effect of $s$-$p$ coupling
• Single-particle and collective excitations in quantum wires comprised of vertically stacked quantum dots: Finite magnetic field