Fast spin rotations by optically controlled geometric phases in a quantum dot

Abstract

We demonstrate optical control of the geometric phase acquired by one of the spin states of an electron confined in a charge-tunable InAs quantum dot via cyclic 2pi excitations of an optical transition in the dot. In the presence of a constant in-plane magnetic field, these optically induced geometric phases result in the effective rotation of the spin about the magnetic field axis and manifest as phase shifts in the spin quantum beat signal generated by two time-delayed circularly polarized optical pulses. The geometric phases generated in this manner more generally perform the role of a spin phase gate, proving potentially useful for quantum information applications.

4 pages, 3 figures, resubmitted to Physical Review Letters

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• Cavity-stimulated Raman emission from a single quantum dot spin
• Scalable qubit architecture based on holes in quantum dot molecules
• Determinisitic Writing and Control of the Dark Exciton Spin using Short Single Optical Pulses
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• Single-shot initialization of electron spin in a quantum dot using a short optical pulse
• High fidelity quantum gates via analytically solvable pulses
• Persistent narrowing of nuclear-spin fluctuations in InAs quantum dots using laser excitation
• Charged excitons and biexcitons in laterally coupled InGaAs quantum dots
• Non-local nuclear spin quieting in quantum dot molecules: Optically-induced extended two-electron spin coherence time
• Probing the dark exciton states of a single quantum dot using photocurrent spectroscopy in magnetic fields
• All-optical controlled phase gate in quantum dot molecules
• All-optical quantum computing with a hybrid solid-state processing unit
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• Controlling the nuclear polarization in quantum dots using optical pulses with a modest bandwidth
• Controlling the Dark Exciton Spin Eigenstates by External Magnetic Field
• Protocol for generating multi-photon entangled states from quantum dots in the presence of nuclear spin fluctuations
• Precise simulation for single-hole spin control in semiconductor quantum dots
• Nonadiabatic geometric rotation of electron spin in a quantum dot by 2Pi hyperbolic secant pulses
• Rapid creation of distant entanglement by multiphoton resonant fluorescence