Photon phase shift at the few-photon level and optical switching by a quantum dot in a microcavity

Abstract

We exploit the nonlinearity arising from the spin-photon interaction in an InAs quantum dot to demonstrate phase shifts of scattered light pulses at the single-photon level. Photon phase shifts of close to 90 degrees are achieved using a charged quantum dot in a micropillar cavity. We also demonstrate a photon phase switch by using a spin-pumping mechanism through Raman transitions in an in-plane magnetic field. The experimental findings are supported by a theoretical model which explores the dynamics of the system. Our results demonstrate the potential of quantum dot-induced nonlinearities for quantum information processing.

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Cited by in corpus (7)

• Quantum repeaters: From quantum networks to the quantum internet
• Resource requirements for efficient quantum communication using all-photonic graph states generated from a few matter qubits
• Deterministic assembly of a charged quantum dot-micropillar cavity device
• Extracting perfect GHZ states from imperfect weighted graph states via entanglement concentration
• Single site-controlled inverted pyramidal InGaAs QD-nanocavity operating at the onset of the strong coupling regime
• Birefringent spin-photon interface generates polarization entanglement
• Spin-augmented observables for efficient photonic quantum error correction