Invention Reference Number
Continuous-variable (CV) quantum communication relies on squeezed light, which is a key resource for transmitting secure quantum signals. The technology for squeezed light transmission traditionally used single-mode squeezing within isolated dark fiber setups. However, this approach is costly and not scalable for commercial networks that must operate across broader distances and use active fiber-optic cables.
Description
This patent presents a system that enables the distribution of two-mode squeezed light over standard active fiber optic networks. The system consists of an optical transmitter that generates jointly squeezed light across two distinct wavelengths. Each squeezed signal is transmitted over separate fiber optic channels to two distant optical receivers. A phase-reference signal and a classical reference signal are multiplexed with the squeezed light, allowing the receivers to generate local oscillators for homodyne detection. The system uses wavelength division multiplexing (WDM) to combine and separate signals while a processor confirms successful squeezing by calculating joint quadrature values from the two received signals.
Benefits
- Scalable quantum communication: Uses standard fiber optic cables, removing the need for dark fiber networks.
- Enhanced data security: Enables quantum key distribution through distributed squeezing, ensuring secure transmission over long distances.
- Cost efficiency: Eliminates the expense associated with dark fiber while still supporting high-level quantum communication.
- Integration with classical networks: Simultaneous transmission of classical data and quantum signals through the same channels.
Applications and Industries
- Quantum key distribution
- Secure quantum communication networks
- Distributed quantum computing systems
- Quantum sensors for network monitoring
Contact
To learn more about this technology, email partnerships@ornl.gov or call 865-574-1051.
