Deterministic Coherent Writing of a Long-Lived Semiconductor Spin Qubit Using One Ultrafast Optical Pulse

Abstract

We use one single, few-picosecond-long, variably polarized laser pulse to deterministically write any selected spin state of a quantum dot confined dark exciton whose life and coherence time are six and five orders of magnitude longer than the laser pulse duration, respectively. The pulse is tuned to an absorption resonance of an excited dark exciton state, which acquires non-negligible oscillator strength due to residual mixing with bright exciton states. We obtain a high fidelity one-to-one mapping from any point on the Poincaré sphere of the pulse polarization to a corresponding point on the Bloch sphere of the spin of the deterministically photogenerated dark exciton.

5 pages, 3 figures

References in corpus (12)

• The Quantum Internet
• Quantum Computing
• Spin relaxation and decoherence of holes in quantum dots
• Observation of extremely slow hole spin relaxation in self-assembled quantum dots
• Determinisitic Writing and Control of the Dark Exciton Spin using Short Single Optical Pulses
• Polarization sensitive spectroscopy of charged 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
• In-plane radiative recombination channel of a dark exciton in self-assembled quantum dots
• Excitation spectroscopy of single quantum dots at tunable positive, neutral and negative charge states
• All optical quantum control of a spin-quantum state and ultrafast transduction into an electric current
• All-Optical Depletion of Dark Excitons from a Semiconductor Quantum Dot

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• From Quantum Dots to Quantum Dashes: Excitonic Spectra of Highly Elongated InAs/InP Nanostructures
• Complete state tomography of a quantum dot confined spin qubit
• Controlling the Dark Exciton Spin Eigenstates by External Magnetic Field
• Peculiar spectra of dark and bright excitons in alloyed nanowire quantum dots
• Dark-bright excitons mixing in alloyed InGaAs self-assembled quantum dots
• Selection Rules for Non-Radiative Carrier Relaxation Processes in Semiconductor Quantum Dots
• Deterministic photon storage and readout in a semimagnetic quantum-dot--cavity system doped with a single Mn ion
• Dirac's spectrum from Newton laws in graphene
• Magneto-optics of a charge-tunable quantum dot: Observation of a negative diamagnetic shift