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Downconversion quantum interface for a single quantum dot spin and 1550-nm single-photon channel.
Jason S Pelc1, Leo Yu, Kristiaan De Greve
1E L Ginzton Laboratory, Stanford University, Stanford, California, USA. jason.pelc@hp.com
Optics Express
|December 25, 2012
Summary
We developed a quantum interface to convert single photons from quantum dots to telecom wavelengths. This breakthrough enables quantum dots to connect with existing fiber optic networks for long-distance quantum communication.
Area of Science:
- Quantum optics
- Quantum communication
- Solid-state physics
Background:
- Long-distance quantum networks need interfaces between matter qubits and photonic channels.
- Semiconductor quantum dots are promising matter qubits but emit at inconvenient wavelengths.
Purpose of the Study:
- To implement a quantum frequency downconversion interface.
- To connect quantum dot emission at 910 nm to 1560 nm telecom wavelengths.
- To preserve single-photon properties and quantum control during conversion.
Main Methods:
- Utilized a periodically poled lithium niobate waveguide for frequency downconversion.
- Employed a 2.2-μm pulsed pump laser for the downconversion process.
- Resonantly excited a semiconductor quantum dot to generate single photons.
Main Results:
- Successfully downconverted quantum dot photons from 910 nm to 1560 nm.
- Preserved single-photon character with g(2)(τ = 0) = 0.17.
- Demonstrated coherent optical control via Rabi oscillations in downconverted photons.
Conclusions:
- The implemented interface is suitable for hybrid quantum networks.
- This work is a key step towards connecting different wavelength subsystems.
- Enables quantum communication using 1.5-μm quantum channels and quantum dots.
