Detecting THz current fluctuations in a quantum point contact using a nanowire quantum dot

Abstract

We use a nanowire quantum dot to probe high-frequency current fluctuations in a nearby quantum point contact. The fluctuations drive charge transitions in the quantum dot, which are measured in real-time with single-electron detection techniques. The quantum point contact (GaAs) and the quantum dot (InAs) are fabricated in different material systems, which indicates that the interactions are mediated by photons rather than phonons. The large energy scales of the nanowire quantum dot allow radiation detection in the long-wavelength infrared regime.

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Cited by in corpus (5)

• Electron counting in quantum dots
• Nongalvanic thermometry for ultracold two-dimensional electron domains
• Noise-induced spectral shift measured in a Double Quantum Dot
• Nonzero temperature effects on antibunched photons emitted by a quantum point contact out of equilibrium
• Ultra-narrow ionization resonances in a quantum dot under broadband excitation