Two-photon comb with wavelength conversion and 20-km distribution for quantum communication
arXiv:2010.05438 · doi:10.1038/s42005-020-00406-1
Abstract
Quantum computing and quantum communication, have been greatly developed in recent years and expected to contribute to quantum internet technologies, including cloud quantum computing and unconditionally secure communication. However, long-distance quantum communication is challenging mainly because of optical fiber losses; quantum repeaters are indispensable for fiber-based transmission because unknown quantum states cannot be amplified with certainty. In this study, we demonstrate a versatile entanglement source in the telecom band for fiber-based quantum internet, which has a narrow linewidth of sub-MHz range, entanglement fidelity of more than 95%, and Bell-state generation even with frequency multimode. Furthermore, after a total distribution length of 20-km in fiber, two-photon correlation is observed with an easily identifiable normalized correlation coefficient, despite the limited bandwidth of the wavelength converter. The presented implementation promises an efficient method for entanglement distribution that is compatible with quantum memory and frequency-multiplexed long-distance quantum communication applications.
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Cited by in corpus (9)
- Recent advances in high-dimensional mode-locked quantum frequency combs
- Coupling of a quantum memory and telecommunication wavelength photons for high-rate entanglement distribution in quantum repeaters
- Offset-locking-based frequency stabilization of external cavity diode lasers for long-distance quantum communication
- Frequency-multiplexed storage and distribution of narrowband telecom photon pairs over a 10-km fiber link with long-term system stability
- Single-shot high-resolution identification of discrete frequency modes of single-photon-level optical pulses
- Nonlinear improvement of measurement-device-independent quantum key distribution using multimode quantum memory
- Designing a compact cavity-enhanced source of entangled photons
- Single-shot high-resolution spectroscopy of single-photon-level optical pulses using a virtually imaged phased-array and single-photon avalanche diode array
- Harnessing Hybrid Frequency-Entangled Qudits through Quantum Interference