Direct generation of tailored pulse-mode entanglement

Abstract

Photonic quantum technology increasingly uses frequency encoding to enable higher quantum information density and noise resilience. Pulsed time-frequency modes (TFM) represent a unique class of spectrally encoded quantum states of light that enable a complete framework for quantum information processing. Here, we demonstrate a technique for direct generation of entangled TFM-encoded states in single-pass, tailored downconversion processes. We achieve unprecedented quality in state generation---high rates, heralding efficiency and state fidelity---as characterised via highly resolved time-of-flight fibre spectroscopy and two-photon interference. We employ this technique in a four-photon entanglement swapping scheme as a primitive for TFM-encoded quantum protocols.

5 pages, 4 figures, 3 pages supplemental material

References in corpus (4)

• Provably-Secure and High-Rate Quantum Key Distribution with Time-Bin Qudits
• A Quantum Pulse Gate based on Spectrally Engineered Sum Frequency Generation
• Fiber-assisted single-photon spectrograph
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