Screening nuclear field fluctuations in quantum dots for indistinguishable photon generation

Abstract

A semiconductor quantum dot can generate highly coherent and indistinguishable single photons. However, intrinsic semiconductor dephasing mechanisms can reduce the visibility of two-photon interference. For an electron in a quantum dot, a fundamental dephasing process is the hyperfine interaction with the nuclear spin bath. Here we directly probe the consequence of the fluctuating nuclear spins on the elastic and inelastic scattered photon spectra from a resident electron in a single dot. We find the nuclear spin fluctuations lead to detuned Raman scattered photons which are distinguishable from both the elastic and incoherent components of the resonance fluorescence. This significantly reduces two-photon interference visibility. However, we demonstrate successful screening of the nuclear spin noise which enables the generation of coherent single photons that exhibit high visibility two-photon interference.

arXiv comment5 pages, 4 figures + Supplementary Information

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• Fundamental Limits to Coherent Photon Generation with Solid-State Atomlike Transitions
• Controllable photonic time-bin qubits from a quantum dot
• Loss of Antibunching
• Frequency-encoded linear cluster states with coherent Raman photons
• Generating indistinguishable photons from a quantum dot in a noisy environment
• The nuclear polaron beyond the mean-field approximation
• Resonance fluorescence revival in a voltage-controlled semiconductor quantum dot
• Loschmidt echo driven by hyperfine and electric-quadrupole interactions in nanoscale nuclear spin baths