Broadband polarization-entangled source for C+L-band flex-grid quantum networks

Abstract

The rising demand for transmission capacity in optical networks has motivated steady interest in expansion beyond the standard C-band (1530-1565 nm) into the adjacent L-band (1565-1625 nm), for an approximate doubling of capacity in a single stroke. However, in the context of quantum networking, the ability to leverage the L-band will require advanced tools for characterization and management of entanglement resources which have so far been lagging. In this work, we demonstrate an ultrabroadband two-photon source integrating both C- and L-band wavelength-selective switches for complete control of spectral routing and allocation across 7.5 THz in a single setup. Polarization state tomography of all 150 pairs of 25 GHz-wide channels reveals an average fidelity of 0.98 and total distillable entanglement greater than 181 kebits/s. This source is explicitly designed for flex-grid optical networks and can facilitate optimal utilization of entanglement resources across the full C+L-band.

5 pages, 4 figures

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• Deployed quantum link characterization via Bayesian ancilla-assisted process tomography
• How to use the dispersion in the ${\chi }^{(3)}$ tensor for broadband generation of polarization-entangled photons
• Scalable low-latency entanglement distribution for distributed quantum computing
• Hybrid classical-quantum communication networks
• In situ quantum verification of polarization-stabilized optical channels