Single electron-spin memory with a semiconductor quantum dot

Abstract

We show storage of the circular polarisation of an optical field, transferring it to the spin-state of an individual electron confined in a single semiconductor quantum dot. The state is subsequently readout through the electronically-triggered emission of a single photon. The emitted photon shares the same polarisation as the initial pulse but has a different energy, making the transfer of quantum information between different physical systems possible. With an applied magnetic field of 2 Tesla, spin memory is preserved for at least 1000 times more than the exciton's radiative lifetime.

7 pages, 4 figures

References in corpus (6)

• Controlling the Spontaneous Emission Rate of Single Quantum Dots in a 2D Photonic Crystal
• Entangled Photon Pairs from Semiconductor Quantum Dots
• Exciton photon strong-coupling regime for a single quantum dot in a microcavity
• Substituting Quantum Entanglement for Communication
• Photon Antibunching from a Single Quantum Dot-Microcavity System in the Strong Coupling Regime
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Cited by in corpus (14)

• Quantum Memories. A Review based on the European Integrated Project "Qubit Applications (QAP)"
• Optically induced rotation of a quantum dot exciton spin
• Exciton-spin memory with a semiconductor quantum dot molecule
• Dynamically controlling the emission of single excitons in photonic crystal cavities
• A comparative study on heat capacity, magnetization and magnetic susceptibility for a GaAs quantum dot with asymmetric confinement
• A Charge and Spin Readout Scheme For Single Self-Assembled Quantum Dots
• Fast preparation of single hole spin in InAs/GaAs quantum dot in Voigt geometry magnetic field
• Fast high fidelity hole spin initialization in a single InGaAs quantum dot
• High-fidelity initialization of long-lived quantum dot hole spin qubits by reduced fine-structure splitting
• Bright electrically controllable quantum-dot-molecule devices fabricated by in-situ electron-beam lithography
• Photon storage with sub-nanosecond readout rise time in coupled quantum wells
• Single spin optical read-out in CdTe/ZnTe quantum dot studied by photon correlation spectroscopy
• Polarization memory in single Quantum Dots
• Spin-filtering and charge- and spin-switching effects in a quantum wire with periodically attached stubs