Abstract
We report on the realization and verification of quantum entanglement between a nitrogen-vacancy electron spin qubit and a telecom-band photonic qubit. First we generate entanglement between the spin qubit and a 637nm photonic time-bin qubit, followed by photonic quantum frequency conversion that transfers the entanglement to a 1588nm photon. We characterize the resulting state by correlation measurements in different bases and find a lower bound to the Bell state fidelity of ≥0.77±0.03. This result presents an important step towards extending quantum networks via optical fiber infrastructure.
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Summary
HAL is a multi-disciplinary open access archive for the deposit and dissemination of scientific research documents, whether they are published or not. Entanglement between a Diamond Spin Qubit and a Photonic Time-Bin Qubit at Telecom Wavelength.
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