Ultrafast optical spin echo for electron spins in semiconductors

Abstract

Spin-based quantum computing and magnetic resonance techniques rely on the ability to measure the coherence time, T2, of a spin system. We report on the experimental implementation of all-optical spin echo to determine the T2 time of a semiconductor electron-spin system. We use three ultrafast optical pulses to rotate spins an arbitrary angle and measure an echo signal as the time between pulses is lengthened. Unlike previous spin-echo techniques using microwaves, ultrafast optical pulses allow clean T2 measurements of systems with dephasing times T2* fast in comparison to the timescale for microwave control. This demonstration provides a step toward ultrafast optical dynamic decoupling of spin-based qubits.

4 pages, 3 figures

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• Theory of electron spin decoherence by interacting nuclear spins in a quantum dot
• Ultrafast optical rotations of electron spins in quantum dots
• Spin-echo of a single electron spin in a quantum dot
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• Universal pulse sequence to minimize spin dephasing in the central spin decoherence problem
• Quantum computers based on electron spins controlled by ultra-fast, off-resonant, single optical pulses
• Ultrafast control of donor-bound electron spins with single detuned optical pulses
• Millisecond spin-flip times of donor-bound electrons in GaAs

Cited by in corpus (23)

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• Quantum computing by optical control of electron spins
• Distributed Quantum Computation Architecture Using Semiconductor Nanophotonics
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• Coherence properties of shallow donor qubits in ZnO
• Photon Antibunching and Magnetospectroscopy of a Single Fluorine Donor in ZnSe
• Spin echo decay at low magnetic fields in a nuclear spin bath
• Quantum metrology in the noisy intermediate-scale quantum era
• Electromagnetically Induced Transparency with an Ensemble of Donor-Bound Electron Spins in a Semiconductor
• Polarization-preserving confocal microscope for optical experiments in a dilution refrigerator with high magnetic field
• Quantum limit for nuclear spin polarization in semiconductor quantum dots
• Properties of donor qubits in ZnO formed by indium ion implantation
• Coherence freeze in an optical lattice investigated via pump-probe spectroscopy
• Stabilizing nuclear spins around semiconductor electrons via the interplay of optical coherent population trapping and dynamic nuclear polarization
• Long-lived electron spins in a modulation doped (100) GaAs quantum well
• Exact dynamics of single qubit gate fidelities under the measurement-based quantum computation scheme
• Quantum repeaters based on individual electron spins and nuclear-spin-ensemble memories in quantum dots
• Electron spin rephasing in $n$-type (001) GaAs quantum wells
• Real-time ab initio description of the photon-echo mechanisms in extended systems: the case study of bulk GaAs
• Coherent spin control by electromagnetic vacuum fluctuations