Journal
NATURE PHOTONICS
Volume 6, Issue 7, Pages 455-458Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/NPHOTON.2012.110
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Funding
- Netherlands Organization for Scientific Research (NWO)
- Dutch Organization for Fundamental Research on Matter (FOM)
- European Research Council
- DARPA QUEST grant
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Interfacing single photons and electrons is a crucial element in sharing quantum information between remote solid-state qubits(1-8). Semiconductor nanowires offer the unique possibility of combining optical quantum dots with avalanche photodiodes, thus enabling the conversion of an incoming single photon into a macroscopic current for efficient electrical detection. Currently, millions of excitation events are required to perform electrical readout of an exciton qubit state(1,6). Here, we demonstrate multiplication of carriers from only a single exciton generated in a quantum dot after tunnelling into a nanowire avalanche photodiode. Owing to the large amplification of both electrons and holes (>10(4)), we reduce by four orders of magnitude the number of excitation events required to electrically detect a single exciton generated in a quantum dot. This work represents a significant step towards achieving single-shot electrical readout and offers a new functionality for on-chip quantum information circuits.
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