Entanglement between a Diamond Spin Qubit and a Photonic Time-Bin Qubit at Telecom Wavelength
article
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.
Topics
TNO Identifier
868576
ISSN
0031-9007
Source
Physical review letters, 123, pp. 063601-1 - 063601-6.
Publisher
American Physical Society APS
Collation
6 p.
Place of publication
Ridge, NY, USA
Pages
063601-1 - 063601-6
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