Coherent properties of a two-level system based on a quantum-dot photodiode
Abstract
Present-day information technology is based mainly on incoherent processes in conventional semiconductor devices. To realize concepts for future quantum information technologies, which are based on coherent phenomena, a new type of 'hardware' is required. Semiconductor quantum dots are promising candidates for the basic device units for quantum information processing. One approach is to exploit optical excitations (excitons) in quantum dots. It has already been demonstrated that coherent manipulation between two excitonic energy levels--via so-called Rabi oscillations--can be achieved in single quantum dots by applying electromagnetic fields. Here we make use of this effect by placing an InGaAs quantum dot in a photodiode, which essentially connects it to an electric circuit. We demonstrate that coherent optical excitations in the quantum-dot two-level system can be converted into deterministic photocurrents. For optical excitation with so-called pi-pulses, which completely invert the two-level system, the current is given by I = fe, where f is the repetition frequency of the experiment and e is the elementary charge. We find that this device can function as an optically triggered single-electron turnstile.
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Before this work, access to a background-free on-demand single-photon source with near-unity indistinguishability proved elusive.
“Yet, access to a background-free on-demand single-photon source with near-unity indistinguishability proved elusive [33].”
From On-demand semiconductor single-photon source with near-unity indistinguishability (2013) · cites this paper as [33]
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- Authors
- Zrenner, A., Beham, E., Stufler, S., Findeis, F., Bichler, M., & Abstreiter, G.
- Affiliations
- Paderborn University (DE)
- Technical University of Munich (DE)
- Corresponding author
- Zrenner, A.
- ORCID
- Zrenner, A.
- Venue
- Nature
- Published
- 2002-08
- Volume
- 418
- Issue
- 6898
- Pages
- 612-614
- ISSN
- 0028-0836 (ISSN-L)
- 1476-4687
- OpenAlex
- W2077157569
- Cited by
- 775
- References
- 15
- Citations by year
- 2026: 11 · 2025: 12 · 2024: 14 · 2023: 9 · 2022: 8 · 2021: 11 · 2020: 19 · 2019: 24 · 2018: 16 · 2017: 26 · 2016: 31 · 2015: 34 · 2014: 27 · 2013: 31 · 2012: 34
- FWCI
- 31.08
- Type
- journal article
- Language
- en
- Open access
- closed
- Licence
- www.springer.com/tdm (tdm)
- Locations
- Nature (publishedVersion)
- PubMed (publishedVersion)
- RePEc: Research Papers in Economics (submittedVersion)
- Funders
- Deutsche Forschungsgemeinschaft
- Bundesministerium für Bildung und Forschung
- Topics
- Physical Sciences › Physics and Astronomy › Atomic and Molecular Physics, and Optics › Semiconductor Quantum Structures and Devices
- Physical Sciences › Physics and Astronomy › Atomic and Molecular Physics, and Optics › Quantum and electron transport phenomena
- Physical Sciences › Computer Science › Artificial Intelligence › Quantum Information and Cryptography
- Keywords
- two-level system, Rabi oscillations, excitons, InGaAs quantum dots, π pulses, single-electron turnstile, quantum information processing
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