Journal
PHYSICAL REVIEW LETTERS
Volume 123, Issue 6, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.123.063601
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Funding
- Netherlands Organisation for Scientific Research (NWO) through a VICI grant
- Zwaartekracht Grant Quantum Software Consortium
- European Research Council through an ERC Consolidator Grant
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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 637 nm photonic time-bin qubit, followed by photonic quantum frequency conversion that transfers the entanglement to a 1588 nm 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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