Single-shot initialization of electron spin in a quantum dot using a short optical pulse

Abstract

We propose a technique to initialize an electron spin in a semiconductor quantum dot with a single short optical pulse. It relies on the fast depletion of the initial spin state followed by a preferential, Purcell-accelerated desexcitation towards the desired state thanks to a micropillar cavity. We theoretically discuss the limits on initialization rate and fidelity, and derive the pulse area for optimal initialization. We show that spin initialization is possible using a single optical pulse down to a few tens of picoseconds wide.

References in corpus (4)

• Controlled light-matter coupling for a single quantum dot embedded in a pillar microcavity using far-field optical lithography
• The entanglement beam splitter: a quantum-dot spin in a double-sided optical microcavity
• Fast initialization of the spin state of an electron in a quantum dot in the Voigt configuration
• Fast spin rotations by optically controlled geometric phases in a quantum dot

Cited by in corpus (8)

• Cavity-enhanced coherent light scattering from a quantum dot
• Coherent spin dynamics of electrons and excitons in nanostructures
• Coupling an electron spin in a semiconductor quantum dot to an optical nano-cavity
• Measurement back-action and spin noise spectroscopy in a charged cavity-QED device in the strong coupling regime
• Generation and detection of mode-locked spin coherence in (In,Ga)As/GaAs quantum dots by laser pulses of long duration
• Optical pumping and initialization of a hole spin in site-controlled InGaAs pyramidal quantum dots
• Fidelity of optically induced single-spin rotations in semiconductor quantum dots in the presence of nuclear spins
• Coherent control of a solid-state quantum bit with few-photon pulses