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Generation and Coherent Control of Pulsed Quantum Frequency Combs
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Single Photon Frequency Conversion for Frequency Multiplexed Quantum Networks in the Telecom Band.
Paul Fisher1, Robert Cernansky1, Ben Haylock1
1Centre for Quantum Computation and Communication Technology (Australian Research Council), Centre for Quantum Dynamics, Griffith University, Brisbane, QLD 4111, Australia.
Physical Review Letters
|July 23, 2021
Summary
Researchers developed a quantum frequency conversion protocol for high-speed, long-range quantum communication. This method efficiently interfaces different telecom frequencies, crucial for quantum networks and quantum memories.
Area of Science:
- Quantum communication
- Integrated photonics
- Nonlinear optics
Background:
- High-speed, long-range quantum communication necessitates integrating frequency multiplexed photonic channels with quantum memories.
- Efficient interfacing between different spectral channels is a key challenge in developing scalable quantum networks.
Purpose of the Study:
- To experimentally demonstrate an integrated quantum frequency conversion protocol.
- To enable efficient interfacing between wavelength division multiplexing (WDM) channels in the telecom range.
- To facilitate the connection of broad frequency spectra with narrowband quantum memories or act as a quantum optical transponder.
Main Methods:
- Utilized a cascaded second-order nonlinear interaction.
- Implemented an integrated photonic circuit for quantum frequency conversion.
- Measured conversion efficiency and Hong-Ou-Mandel (HOM) dip visibility.
Main Results:
- Achieved a quantum frequency conversion efficiency of 55±8%.
- Obtained a noise-subtracted Hong-Ou-Mandel (HOM) dip visibility of 84.5%.
- Demonstrated the protocol's capability to convert between WDM channels in the telecom band.
Conclusions:
- The demonstrated protocol is effective for interfacing diverse frequencies with quantum memories.
- The protocol can serve as a quantum optical transponder for frequency-multiplexed spectra.
- This advancement is significant for building high-speed, long-range quantum communication systems.
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