High-fidelity initialization of long-lived quantum dot hole spin qubits by reduced fine-structure splitting

Abstract

We demonstrate an on-demand hole spin qubit initialization scheme meeting four key requirements of quantum information processing: fast initialization (1/e ~ 100 ps), high fidelity (F > 99%), long qubit lifetime $(2T_1>T_2^{\ast }\simeq 10\mathrm{ns})$, and compatibility with optical coherent control schemes. This is achieved by rapidly ionizing an exciton in an InGaAs quantum dot with very low fine-structure splitting at zero magnetic field. Furthermore, we show that the hole spin fidelity of an arbitrary quantum dot can be increased by optical Stark effect tuning of the fine-structure splitting close to zero.

Manuscript (6 pages, 5 figures) followed by supplemental materials (4 pages, 3 figures)

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Cited by in corpus (16)

• Anisotropy-Induced Quantum Interference and Population Trapping Between Orthogonal Quantum Dot Exciton States in Semiconductor Cavity Systems
• Path-dependent initialization of a single quantum dot exciton spin in a nano-photonic waveguide
• Wavelength-tunable high-fidelity entangled photon sources enabled by dual Stark effects
• Non-local nuclear spin quieting in quantum dot molecules: Optically-induced extended two-electron spin coherence time
• Probing large-scale magnetism with the Cosmic Microwave Background
• Ultrafast Depopulation of a Quantum Dot by LA-phonon-assisted Stimulated Emission
• Controlled tunneling induced dephasing of Rabi rotations for ultra-high fidelity hole spin initialization
• Three-dimensional electrical control of the excitonic fine structure for a quantum dot in a cavity
• Inverse design of environment-induced coherence
• Dynamic vibronic coupling in InGaAs quantum dots
• High-Fidelity and Ultrafast Initialization of a Hole Spin Bound to a Te Isoelectronic Center in ZnS
• Precise simulation for single-hole spin control in semiconductor quantum dots
• All-electric single electron spin initialization
• Ultrafast spin initialization in a gated InSb nanowire quantum dots
• 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