Photoconductance Quantization in a Single-Photon Detector

Details Photoconductance Quantization in a Single-Photon Detector Photoconductance Quantization in a Single-Photon Detector

2001-12-20

arxiv.org/abs/quant-ph/0112125v1

Phys. Rev. B 65, R201307 (2002)

Physics

Quantum Physics

4 pages, 4 figures

Scientific paper

10.1103/PhysRevB.65.201307

We have made a single-photon detector that relies on photoconductive gain in a narrow electron channel in an AlGaAs/GaAs 2-dimensional electron gas. Given that the electron channel is 1-dimensional, the photo-induced conductance has plateaus at multiples of the quantum conductance 2e$^{2}$/h. Super-imposed on these broad conductance plateaus are many sharp, small, conductance steps associated with single-photon absorption events that produce individual photo-carriers. This type of photoconductive detector could measure a single photon, while safely storing and protecting the spin degree of freedom of its photo-carrier. This function is valuable for a quantum repeater that would allow very long distance teleportation of quantum information.

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