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Two-photon interference using background-free quantum frequency conversion of single photons emitted by an InAs
Serkan Ates1, Imad Agha, Angelo Gulinatti
1Center for Nanoscale Science and Technology, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, USA. serkan.ates@nist.gov
Physical Review Letters
|October 23, 2012
Summary
Quantum frequency conversion (QFC) enables solid-state quantum emitters to overcome spectral differences. This method preserves single-photon properties and demonstrates nonclassical interference for quantum information applications.
Area of Science:
- Quantum optics
- Solid-state quantum emitters
- Nonlinear optics
Background:
- Inhomogeneously broadened solid-state quantum emitters often suffer from spectral distinguishability, hindering their use in quantum networks.
- Quantum frequency conversion (QFC) offers a potential solution to manage spectral properties of quantum emitters.
Purpose of the Study:
- To demonstrate that QFC can overcome spectral distinguishability in solid-state quantum emitters.
- To preserve the quantum properties of single photons during frequency conversion.
- To show the generation of nonclassical states of light via QFC.
Main Methods:
- Single photons from an InAs/GaAs quantum dot (QD) at 980 nm were combined with a 1550 nm pump laser.
- Periodically poled lithium niobate (PPLN) waveguide was used for efficient frequency conversion.
- Photon correlation and two-photon interference measurements were performed to verify quantum properties.
Main Results:
- Photons were generated at 600 nm with a high signal-to-background ratio (>100:1).
- Single photon character and wave packet interference of individual QD states were preserved.
- Two spectrally distinct QD transitions were converted to the same wavelength, exhibiting nonclassical two-photon interference.
Conclusions:
- QFC is an effective technique to overcome spectral distinguishability in solid-state quantum emitters.
- The quantum nature of photons from QDs is maintained throughout the conversion process.
- This work paves the way for improved quantum communication and computation using solid-state sources.
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