Depolarization of Electronic Spin Qubits Confined in Semiconductor Quantum Dots

Abstract

Quantum dots are arguably the best interface between matter spin qubits and flying photonic qubits. Using quantum dot devices to produce joint spin-photonic states requires the electronic spin qubits to be stored for extended times. Therefore, the study of the coherence of spins of various quantum dot confined charge carriers is important both scientifically and technologically. In this study we report on spin relaxation measurements performed on five different forms of electronic spin qubits confined in the very same quantum dot. In particular, we use all optical techniques to measure the spin relaxation of the confined heavy hole and that of the dark exciton - a long lived electron-heavy hole pair with parallel spins. Our measured results for the spin relaxation of the electron, the heavy-hole, the dark exciton, the negative and the positive trions, in the absence of externally applied magnetic field, are in agreement with a central spin theory which attributes the dephasing of the carriers' spin to their hyperfine interactions with the nuclear spins of the atoms forming the quantum dots. We demonstrate that the heavy hole dephases much slower than the electron. We also show, both experimentally and theoretically, that the dark exciton dephases slower than the heavy hole, due to the electron-hole exchange interaction, which partially protects its spin state from dephasing.

arXiv comment12 pages, 5 figures, 1 table

References in corpus (32)

• Quantum Computation with Quantum Dots
• The Quantum Internet
• The Physical Implementation of Quantum Computation
• Electron spin relaxation by nuclei in semiconductor quantum dots
• Electron spin decoherence in quantum dots due to interaction with nuclei
• Deterministic Generation of a Cluster State of Entangled Photons
• Multi-Exciton Spectroscopy of a Single Self Assembled Quantum Dot
• Optical pumping of electronic and nuclear spin in single charge-tunable quantum dots
• Spin decoherence of a heavy hole coupled to nuclear spins in a quantum dot
• Coherent control and suppressed nuclear feedback of a single quantum dot hole qubit
• Hole - Nuclear Spin Interaction in Quantum Dots
• Demonstration of quantum entanglement between a single electron spin confined to an InAs quantum dot and a photon
• Fast optical preparation, control and read-out of single quantum dot spin
• Three stage decoherence dynamics of electron spin qubits in an optically active quantum dot
• Numerical modeling of the central spin problem using the spin coherent states P-representation
• Intrinsic spin fluctuations reveal the dynamical response function of holes coupled to nuclear spin baths in (In,Ga)As quantum dots
• Isotope sensitive measurement of the hole-nuclear spin interaction in quantum dots
• Evolution of a localized electron spin in a nuclear spin environment
• Direct Measurement of Quantum Dot Spin Dynamics using Time-Resolved Resonance Fluorescence
• Determinisitic Writing and Control of the Dark Exciton Spin using Short Single Optical Pulses
• Role of Nuclear Quadrupole Coupling on Decoherence and Relaxation of Central Spins in Quantum Dots
• Optically induced rotation of a quantum dot exciton spin
• Coherent optical writing and reading of the exciton spin state in single quantum dots
• Complete control of a matter qubit using a single picosecond laser pulse
• Atomistic theory of dark excitons in self-assembled quantum dots of reduced symmetry
• Coherence of a dynamically decoupled quantum-dot hole spin
• Excitation spectroscopy of single quantum dots at tunable positive, neutral and negative charge states
• Measurement of g-factor tensor in a quantum dot and disentanglement of exciton spins
• Electron-nuclear dynamics in a quantum dot under non-unitary electron control
• Strong Hyperfine-Induced Modulation of an Optically-Driven Hole Spin in an InAs Quantum Dot
• Deterministic Coherent Writing of a Long-Lived Semiconductor Spin Qubit Using One Ultrafast Optical Pulse
• All-Optical Depletion of Dark Excitons from a Semiconductor Quantum Dot

Cited by in corpus (16)

• Quartet states in two-electron quantum dots in bilayer graphene
• Shell Filling and Trigonal Warping in Graphene Quantum Dots
• Atomistic theory of electronic and optical properties of InAsP/InP nanowire quantum dots
• Continuous protection of a collective state from inhomogeneous dephasing
• Optical Phase Measurement Using a Deterministic Source of Entangled Multi-photon States
• Probing the dynamics and coherence of a semiconductor hole spin via acoustic phonon-assisted excitation
• Multiplexed Single Photons from Deterministically Positioned Nanowire Quantum Dots
• Deterministic preparation of spin qubits in droplet etched GaAs quantum dots using quasi-resonant excitation
• Continuous and deterministic all-photonic cluster state of indistinguishable photons
• Complete state tomography of a quantum dot confined spin qubit
• The coherence of quantum dot confined electron- and hole-spin in low external magnetic field
• Simulating photonic devices with noisy optical elements
• Long-time memory effects in a localizable central spin problem
• Initialization of Neutral and Charged Exciton Spin States in a Telecom-Emitting Quantum Dot
• Hidden anisotropy controls spin-photon entanglement in a charged quantum dot
• Eliminating the confined dark-exciton qubit precession using an externally applied magnetic field